false2021Q20000895421--12-31MORGAN STANLEYtruefalseus-gaap:AccountingStandardsUpdate201613Member00008954212021-01-012021-06-300000895421us-gaap:CommonClassAMember2021-01-012021-06-300000895421us-gaap:SeriesAPreferredStockMember2021-01-012021-06-300000895421us-gaap:SeriesEPreferredStockMember2021-01-012021-06-300000895421us-gaap:SeriesFPreferredStockMember2021-01-012021-06-300000895421ms:SeriesIPreferredStockMember2021-01-012021-06-300000895421ms:SeriesKPreferredStockMember2021-01-012021-06-300000895421ms:SeriesLPreferredStockMember2021-01-012021-06-300000895421ms:GlobalMediumTermNotesSeriesAFixedRateStepUpSeniorNotesDue2026ofMorganStanleyFinanceLLCMember2021-01-012021-06-30xbrli:shares00008954212021-07-30iso4217:USD00008954212021-04-012021-06-3000008954212020-04-012020-06-3000008954212020-01-012020-06-300000895421ms:EatonVanceCorp.Member2021-04-012021-06-30iso4217:USDxbrli:shares00008954212021-06-3000008954212020-12-310000895421us-gaap:PreferredStockMember2021-03-310000895421us-gaap:PreferredStockMember2020-03-310000895421us-gaap:PreferredStockMember2020-12-310000895421us-gaap:PreferredStockMember2019-12-310000895421us-gaap:PreferredStockMember2021-01-012021-06-300000895421us-gaap:PreferredStockMember2021-06-300000895421us-gaap:PreferredStockMember2020-06-300000895421us-gaap:CommonStockMember2021-06-300000895421us-gaap:CommonStockMember2020-06-300000895421us-gaap:AdditionalPaidInCapitalMember2021-03-310000895421us-gaap:AdditionalPaidInCapitalMember2020-03-310000895421us-gaap:AdditionalPaidInCapitalMember2020-12-310000895421us-gaap:AdditionalPaidInCapitalMember2019-12-310000895421us-gaap:AdditionalPaidInCapitalMember2021-04-012021-06-300000895421us-gaap:AdditionalPaidInCapitalMember2020-04-012020-06-300000895421us-gaap:AdditionalPaidInCapitalMember2021-01-012021-06-300000895421us-gaap:AdditionalPaidInCapitalMember2020-01-012020-06-300000895421us-gaap:AdditionalPaidInCapitalMember2021-06-300000895421us-gaap:AdditionalPaidInCapitalMember2020-06-300000895421us-gaap:RetainedEarningsMember2021-03-310000895421us-gaap:RetainedEarningsMember2020-03-310000895421us-gaap:RetainedEarningsMember2020-12-310000895421us-gaap:RetainedEarningsMember2019-12-3100008954212020-01-012020-03-310000895421srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:RetainedEarningsMember2021-03-310000895421srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:RetainedEarningsMember2020-03-310000895421srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:RetainedEarningsMember2020-12-310000895421srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:RetainedEarningsMember2019-12-310000895421us-gaap:RetainedEarningsMember2021-04-012021-06-300000895421us-gaap:RetainedEarningsMember2020-04-012020-06-300000895421us-gaap:RetainedEarningsMember2021-01-012021-06-300000895421us-gaap:RetainedEarningsMember2020-01-012020-06-300000895421us-gaap:RetainedEarningsMember2021-06-300000895421us-gaap:RetainedEarningsMember2020-06-300000895421us-gaap:TrustForBenefitOfEmployeesMember2021-03-310000895421us-gaap:TrustForBenefitOfEmployeesMember2020-03-310000895421us-gaap:TrustForBenefitOfEmployeesMember2020-12-310000895421us-gaap:TrustForBenefitOfEmployeesMember2019-12-310000895421us-gaap:TrustForBenefitOfEmployeesMember2021-04-012021-06-300000895421us-gaap:TrustForBenefitOfEmployeesMember2020-04-012020-06-300000895421us-gaap:TrustForBenefitOfEmployeesMember2021-01-012021-06-300000895421us-gaap:TrustForBenefitOfEmployeesMember2020-01-012020-06-300000895421us-gaap:TrustForBenefitOfEmployeesMember2021-06-300000895421us-gaap:TrustForBenefitOfEmployeesMember2020-06-300000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-03-310000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-03-310000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-04-012021-06-300000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-04-012020-06-300000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-06-300000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-06-300000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-06-300000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-06-300000895421us-gaap:TreasuryStockMember2021-03-310000895421us-gaap:TreasuryStockMember2020-03-310000895421us-gaap:TreasuryStockMember2020-12-310000895421us-gaap:TreasuryStockMember2019-12-310000895421us-gaap:TreasuryStockMember2021-04-012021-06-300000895421us-gaap:TreasuryStockMember2020-04-012020-06-300000895421us-gaap:TreasuryStockMember2021-01-012021-06-300000895421us-gaap:TreasuryStockMember2020-01-012020-06-300000895421us-gaap:TreasuryStockMember2021-06-300000895421us-gaap:TreasuryStockMember2020-06-300000895421ms:CommonStockIssuedToEmployeeTrustMember2021-03-310000895421ms:CommonStockIssuedToEmployeeTrustMember2020-03-310000895421ms:CommonStockIssuedToEmployeeTrustMember2020-12-310000895421ms:CommonStockIssuedToEmployeeTrustMember2019-12-310000895421ms:CommonStockIssuedToEmployeeTrustMember2021-04-012021-06-300000895421ms:CommonStockIssuedToEmployeeTrustMember2020-04-012020-06-300000895421ms:CommonStockIssuedToEmployeeTrustMember2021-01-012021-06-300000895421ms:CommonStockIssuedToEmployeeTrustMember2020-01-012020-06-300000895421ms:CommonStockIssuedToEmployeeTrustMember2021-06-300000895421ms:CommonStockIssuedToEmployeeTrustMember2020-06-300000895421us-gaap:NoncontrollingInterestMember2021-03-310000895421us-gaap:NoncontrollingInterestMember2020-03-310000895421us-gaap:NoncontrollingInterestMember2020-12-310000895421us-gaap:NoncontrollingInterestMember2019-12-310000895421us-gaap:NoncontrollingInterestMember2021-04-012021-06-300000895421us-gaap:NoncontrollingInterestMember2020-04-012020-06-300000895421us-gaap:NoncontrollingInterestMember2021-01-012021-06-300000895421us-gaap:NoncontrollingInterestMember2020-01-012020-06-300000895421us-gaap:NoncontrollingInterestMember2021-06-300000895421us-gaap:NoncontrollingInterestMember2020-06-3000008954212020-06-3000008954212019-12-31xbrli:pure0000895421ms:EatonVanceCorp.Member2021-03-010000895421ms:EatonVanceCorp.Member2021-03-012021-03-010000895421ms:EatonVanceCorp.Memberus-gaap:CommonClassAMember2021-03-012021-03-010000895421ms:EatonVanceCorp.Memberms:ManagementContractsMember2021-03-010000895421ms:EatonVanceCorp.Memberus-gaap:CustomerRelationshipsMember2021-03-012021-03-010000895421ms:EatonVanceCorp.Memberus-gaap:CustomerRelationshipsMember2021-03-010000895421ms:EatonVanceCorp.Memberus-gaap:TradeNamesMember2021-03-012021-03-010000895421ms:EatonVanceCorp.Memberus-gaap:TradeNamesMember2021-03-010000895421ms:EatonVanceCorp.Memberms:ManagementContractsMember2021-03-012021-03-010000895421ms:EatonVanceCorp.Memberms:ManagementContractsMember2021-03-010000895421ms:EatonVanceCorp.Member2021-01-012021-06-300000895421ms:EatonVanceCorp.Member2020-04-012020-06-300000895421ms:EatonVanceCorp.Member2020-01-012020-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:USTreasuryAndGovernmentMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:USTreasuryAndGovernmentMember2021-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Memberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-06-300000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel12And3Member2021-06-300000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:USTreasuryAndGovernmentMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:USTreasuryAndGovernmentMember2020-12-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Memberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel12And3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SeniorDebtObligationsMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421ms:SecuredLendingFacilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-06-300000895421ms:SecuredLendingFacilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:SeniorDebtObligationsMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialPortfolioSegmentMemberus-gaap:SeniorDebtObligationsMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialPortfolioSegmentMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:SecuritiesBasedLendingandOtherLoansMemberus-gaap:SeniorDebtObligationsMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:SecuritiesBasedLendingandOtherLoansMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FutureMemberms:AccountsReceivableAndOtherReceivablesNetMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FutureMemberms:AccountsReceivableAndOtherReceivablesNetMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMember2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMember2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMember2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMember2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMember2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMember2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMember2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMember2020-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MortgageAndAssetBackedSecuritiesMember2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MortgageAndAssetBackedSecuritiesMember2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MortgageAndAssetBackedSecuritiesMember2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MortgageAndAssetBackedSecuritiesMember2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MortgageAndAssetBackedSecuritiesMember2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MortgageAndAssetBackedSecuritiesMember2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MortgageAndAssetBackedSecuritiesMember2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MortgageAndAssetBackedSecuritiesMember2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentsMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentsMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentsMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentsMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentsMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentsMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentsMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentsMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InvestmentsMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DepositsMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DepositsMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DepositsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DepositsMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DepositsMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DepositsMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DepositsMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DepositsMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DepositsMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:DepositsMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421ms:OtherSecuredFinancingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421ms:OtherSecuredFinancingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421ms:OtherSecuredFinancingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421ms:OtherSecuredFinancingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421ms:OtherSecuredFinancingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421ms:OtherSecuredFinancingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421ms:OtherSecuredFinancingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421ms:OtherSecuredFinancingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421ms:OtherSecuredFinancingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421ms:OtherSecuredFinancingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-03-310000895421us-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-03-310000895421us-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-03-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-03-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMembersrt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2021-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2021-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2021-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputMarginLoanMemberms:ValuationTechniqueMarginLoanMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputMarginLoanMemberms:ValuationTechniqueMarginLoanMembersrt:MaximumMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputMarginLoanMembersrt:WeightedAverageMemberms:ValuationTechniqueMarginLoanMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputMarginLoanMemberms:ValuationTechniqueMarginLoanMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputMarginLoanMemberms:ValuationTechniqueMarginLoanMembersrt:MaximumMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputMarginLoanMembersrt:WeightedAverageMemberms:ValuationTechniqueMarginLoanMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421ms:MeasurementInputLoanPriceMembersrt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421ms:MeasurementInputLoanPriceMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:MaximumMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421ms:MeasurementInputLoanPriceMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:WeightedAverageMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421ms:MeasurementInputLoanPriceMembersrt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421ms:MeasurementInputLoanPriceMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:MaximumMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421ms:MeasurementInputLoanPriceMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:WeightedAverageMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:MaximumMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:WeightedAverageMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:MaximumMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:WeightedAverageMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputRecoveryRateMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MaximumMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputRecoveryRateMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:ArithmeticAverageMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputRecoveryRateMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberms:MeasurementInputRecoveryRateMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputRecoveryRateMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MaximumMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputRecoveryRateMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:ArithmeticAverageMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputRecoveryRateMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberms:MeasurementInputRecoveryRateMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityVolatilityMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityVolatilityMembersrt:MaximumMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputEquityVolatilityMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityVolatilityMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityVolatilityMembersrt:MaximumMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputEquityVolatilityMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:MeasurementInputSharePriceMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:MeasurementInputSharePriceMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputWeightedAverageCostOfCapitalMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMemberms:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputWeightedAverageCostOfCapitalMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMemberms:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputExitMultipleMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputExitMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputExitMultipleMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputExitMultipleMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputExitMultipleMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputExitMultipleMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:MeasurementInputEbitdaMultipleMembersrt:MinimumMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:MeasurementInputEbitdaMultipleMembersrt:MinimumMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:MeasurementInputSharePriceMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:MeasurementInputSharePriceMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:MeasurementInputSharePriceMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:MeasurementInputSharePriceMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:MeasurementInputSharePriceMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:MeasurementInputSharePriceMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:MeasurementInputInterestRateCurveCorrelationMembersrt:MinimumMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:MeasurementInputInterestRateCurveCorrelationMembersrt:MinimumMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputBondVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputBondVolatilityMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputBondVolatilityMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputBondVolatilityMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputBondVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputBondVolatilityMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputBondVolatilityMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputBondVolatilityMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInflationVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInflationVolatilityMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInflationVolatilityMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInflationVolatilityMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInflationVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInflationVolatilityMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInflationVolatilityMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInflationVolatilityMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputCashSyntheticBasisMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputCashSyntheticBasisMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:MeasurementInputCreditSpreadMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:MeasurementInputCreditSpreadMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputFundingSpreadMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputFundingSpreadMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputFundingSpreadMembersrt:WeightedAverageMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputFundingSpreadMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputFundingSpreadMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputFundingSpreadMembersrt:WeightedAverageMemberus-gaap:CreditRiskContractMemberms:CreditDefaultSwapModelMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberms:ValuationTechniqueCorrelationModelMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:MeasurementInputCreditCorrelationMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421ms:ValuationTechniqueCorrelationModelMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:MeasurementInputCreditCorrelationMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421ms:ValuationTechniqueCorrelationModelMemberus-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:CreditRiskContractMemberms:MeasurementInputCreditCorrelationMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421srt:MinimumMemberms:ValuationTechniqueCorrelationModelMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:MeasurementInputCreditCorrelationMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421ms:ValuationTechniqueCorrelationModelMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMemberms:MeasurementInputCreditCorrelationMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421ms:ValuationTechniqueCorrelationModelMemberus-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:CreditRiskContractMemberms:MeasurementInputCreditCorrelationMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputForeignExchangeVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputForeignExchangeVolatilitySkewMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputForeignExchangeVolatilitySkewMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputForeignExchangeVolatilitySkewMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputForeignExchangeVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputForeignExchangeVolatilitySkewMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputForeignExchangeVolatilitySkewMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputForeignExchangeVolatilitySkewMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputContingencyProbabilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputContingencyProbabilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputContingencyProbabilityMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputContingencyProbabilityMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputContingencyProbabilityMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityVolatilityMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityVolatilityMemberus-gaap:EquityContractMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputEquityVolatilityMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityVolatilityMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityVolatilityMemberus-gaap:EquityContractMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputEquityVolatilityMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityVolatilitySkewMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityVolatilitySkewMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityVolatilitySkewMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityVolatilitySkewMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityVolatilitySkewMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityVolatilitySkewMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberms:MeasurementInputForeignExchangeCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMembersrt:MaximumMemberms:MeasurementInputForeignExchangeCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:EquityContractMemberms:MeasurementInputForeignExchangeCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberms:MeasurementInputForeignExchangeCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMembersrt:MaximumMemberms:MeasurementInputForeignExchangeCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:EquityContractMemberms:MeasurementInputForeignExchangeCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:MeasurementInputInterestRateCorrelationMembersrt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:MeasurementInputInterestRateCorrelationMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:MeasurementInputInterestRateCorrelationMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:MeasurementInputInterestRateCorrelationMembersrt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:MeasurementInputInterestRateCorrelationMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:MeasurementInputInterestRateCorrelationMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:MeasurementInputInterestRateCorrelationMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputForwardPowerPriceMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputForwardPowerPriceMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputForwardPowerPriceMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputForwardPowerPriceMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputForwardPowerPriceMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputForwardPowerPriceMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputCommodityVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputCommodityVolatilityMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputCommodityVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputCommodityVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputCommodityVolatilityMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputCommodityVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputCrossCommodityCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberms:MeasurementInputCrossCommodityCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputCrossCommodityCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputCrossCommodityCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberms:MeasurementInputCrossCommodityCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputCrossCommodityCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityVolatilityMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:MeasurementInputSharePriceMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:MeasurementInputSharePriceMemberms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputFundingSpreadMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputFundingSpreadMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputFundingSpreadMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputFundingSpreadMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputFundingSpreadMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputFundingSpreadMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421ms:MeasurementInputLoanPriceMembersrt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421ms:MeasurementInputLoanPriceMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421ms:MeasurementInputLoanPriceMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421ms:MeasurementInputLoanPriceMembersrt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421ms:MeasurementInputLoanPriceMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421ms:MeasurementInputLoanPriceMemberus-gaap:FairValueMeasurementsRecurringMemberms:ValuationTechniqueComparablePricingMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityVolatilityMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityVolatilitySkewMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityVolatilitySkewMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityVolatilitySkewMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityVolatilitySkewMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityVolatilitySkewMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityVolatilitySkewMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputEquityCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityForeignExchangeCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberms:MeasurementInputEquityForeignExchangeCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputEquityForeignExchangeCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputEquityForeignExchangeCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberms:MeasurementInputEquityForeignExchangeCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:WeightedAverageMemberms:MeasurementInputEquityForeignExchangeCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2021-06-300000895421srt:MinimumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:MaximumMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membersrt:MedianMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:ValuationTechniqueOptionPricingModelMember2020-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsNonrecurringMemberms:ValuationTechniqueCorporateLoanModelMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:MeasurementInputCreditSpreadMembersrt:MaximumMemberus-gaap:FairValueMeasurementsNonrecurringMemberms:ValuationTechniqueCorporateLoanModelMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421srt:WeightedAverageMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsNonrecurringMemberms:ValuationTechniqueCorporateLoanModelMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421srt:MinimumMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsNonrecurringMemberms:ValuationTechniqueCorporateLoanModelMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:MeasurementInputCreditSpreadMembersrt:MaximumMemberus-gaap:FairValueMeasurementsNonrecurringMemberms:ValuationTechniqueCorporateLoanModelMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:WeightedAverageMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsNonrecurringMemberms:ValuationTechniqueCorporateLoanModelMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberus-gaap:MeasurementInputCreditSpreadMemberms:ValuationTechniqueWarehouseModelMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:MeasurementInputCreditSpreadMembersrt:MaximumMemberms:ValuationTechniqueWarehouseModelMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421srt:WeightedAverageMemberus-gaap:MeasurementInputCreditSpreadMemberms:ValuationTechniqueWarehouseModelMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421srt:MinimumMemberus-gaap:MeasurementInputCreditSpreadMemberms:ValuationTechniqueWarehouseModelMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:MeasurementInputCreditSpreadMembersrt:MaximumMemberms:ValuationTechniqueWarehouseModelMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:WeightedAverageMemberus-gaap:MeasurementInputCreditSpreadMemberms:ValuationTechniqueWarehouseModelMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421srt:MinimumMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421ms:ValuationTechniqueComparablePricingMembersrt:MaximumMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421ms:ValuationTechniqueComparablePricingMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMember2020-12-310000895421us-gaap:PrivateEquityFundsMember2021-06-300000895421us-gaap:PrivateEquityFundsMember2020-12-310000895421us-gaap:RealEstateFundsMember2021-06-300000895421us-gaap:RealEstateFundsMember2020-12-310000895421us-gaap:HedgeFundsMember2021-06-300000895421us-gaap:HedgeFundsMember2020-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMember2021-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMember2020-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:LendingCommitmentMember2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:LendingCommitmentMember2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:LendingCommitmentMember2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:LendingCommitmentMember2020-01-012020-06-300000895421us-gaap:GoodwillMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-04-012021-06-300000895421us-gaap:GoodwillMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-04-012020-06-300000895421us-gaap:GoodwillMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-01-012021-06-300000895421us-gaap:GoodwillMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:IntangibleAssetsMember2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:IntangibleAssetsMember2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:IntangibleAssetsMember2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:IntangibleAssetsMember2020-01-012020-06-300000895421us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-04-012021-06-300000895421us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-04-012020-06-300000895421us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-01-012021-06-300000895421us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-01-012020-06-300000895421ms:PropertyPlantAndEquipmentAndCapitalizedSoftwareCostsMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-04-012021-06-300000895421ms:PropertyPlantAndEquipmentAndCapitalizedSoftwareCostsMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-04-012020-06-300000895421ms:PropertyPlantAndEquipmentAndCapitalizedSoftwareCostsMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-01-012021-06-300000895421ms:PropertyPlantAndEquipmentAndCapitalizedSoftwareCostsMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:AssetsMember2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:AssetsMember2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:AssetsMember2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:AssetsMember2020-01-012020-06-300000895421us-gaap:OtherLiabilitiesMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-04-012021-06-300000895421us-gaap:OtherLiabilitiesMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-04-012020-06-300000895421us-gaap:OtherLiabilitiesMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-01-012021-06-300000895421us-gaap:OtherLiabilitiesMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-01-012020-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LiabilityMember2021-04-012021-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LiabilityMember2020-04-012020-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LiabilityMember2021-01-012021-06-300000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LiabilityMember2020-01-012020-06-300000895421us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMember2021-06-300000895421us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2021-06-300000895421us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2021-06-300000895421us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2021-06-300000895421us-gaap:EstimateOfFairValueFairValueDisclosureMember2021-06-300000895421us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMember2020-12-310000895421us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateContractMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberms:CommodityAndOtherContractsMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2021-06-300000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2020-12-310000895421us-gaap:DebtMemberus-gaap:TradingRevenueMember2021-04-012021-06-300000895421us-gaap:DebtMemberus-gaap:TradingRevenueMember2020-04-012020-06-300000895421us-gaap:DebtMemberus-gaap:TradingRevenueMember2021-01-012021-06-300000895421us-gaap:DebtMemberus-gaap:TradingRevenueMember2020-01-012020-06-300000895421us-gaap:InterestExpenseMemberus-gaap:DebtMember2021-04-012021-06-300000895421us-gaap:InterestExpenseMemberus-gaap:DebtMember2020-04-012020-06-300000895421us-gaap:InterestExpenseMemberus-gaap:DebtMember2021-01-012021-06-300000895421us-gaap:InterestExpenseMemberus-gaap:DebtMember2020-01-012020-06-300000895421us-gaap:DebtMember2021-04-012021-06-300000895421us-gaap:DebtMember2020-04-012020-06-300000895421us-gaap:DebtMember2021-01-012021-06-300000895421us-gaap:DebtMember2020-01-012020-06-300000895421us-gaap:TradingRevenueMemberms:LoansAndOtherDebtMember2021-04-012021-06-300000895421ms:LoansAndOtherDebtMemberus-gaap:OtherComprehensiveIncomeMember2021-04-012021-06-300000895421us-gaap:TradingRevenueMemberms:LoansAndOtherDebtMember2020-04-012020-06-300000895421ms:LoansAndOtherDebtMemberus-gaap:OtherComprehensiveIncomeMember2020-04-012020-06-300000895421us-gaap:TradingRevenueMemberus-gaap:WrittenLoanCommitmentFairValueOptionMember2021-04-012021-06-300000895421us-gaap:OtherComprehensiveIncomeMemberus-gaap:WrittenLoanCommitmentFairValueOptionMember2021-04-012021-06-300000895421us-gaap:TradingRevenueMemberus-gaap:WrittenLoanCommitmentFairValueOptionMember2020-04-012020-06-300000895421us-gaap:OtherComprehensiveIncomeMemberus-gaap:WrittenLoanCommitmentFairValueOptionMember2020-04-012020-06-300000895421us-gaap:TradingRevenueMemberus-gaap:DepositsMember2021-04-012021-06-300000895421us-gaap:DepositsMemberus-gaap:OtherComprehensiveIncomeMember2021-04-012021-06-300000895421us-gaap:TradingRevenueMemberus-gaap:DepositsMember2020-04-012020-06-300000895421us-gaap:DepositsMemberus-gaap:OtherComprehensiveIncomeMember2020-04-012020-06-300000895421us-gaap:DebtMemberus-gaap:OtherComprehensiveIncomeMember2021-04-012021-06-300000895421us-gaap:DebtMemberus-gaap:OtherComprehensiveIncomeMember2020-04-012020-06-300000895421us-gaap:TradingRevenueMemberms:LoansAndOtherDebtMember2021-01-012021-06-300000895421ms:LoansAndOtherDebtMemberus-gaap:OtherComprehensiveIncomeMember2021-01-012021-06-300000895421us-gaap:TradingRevenueMemberms:LoansAndOtherDebtMember2020-01-012020-06-300000895421ms:LoansAndOtherDebtMemberus-gaap:OtherComprehensiveIncomeMember2020-01-012020-06-300000895421us-gaap:TradingRevenueMemberus-gaap:WrittenLoanCommitmentFairValueOptionMember2021-01-012021-06-300000895421us-gaap:OtherComprehensiveIncomeMemberus-gaap:WrittenLoanCommitmentFairValueOptionMember2021-01-012021-06-300000895421us-gaap:TradingRevenueMemberus-gaap:WrittenLoanCommitmentFairValueOptionMember2020-01-012020-06-300000895421us-gaap:OtherComprehensiveIncomeMemberus-gaap:WrittenLoanCommitmentFairValueOptionMember2020-01-012020-06-300000895421us-gaap:TradingRevenueMemberus-gaap:DepositsMember2021-01-012021-06-300000895421us-gaap:DepositsMemberus-gaap:OtherComprehensiveIncomeMember2021-01-012021-06-300000895421us-gaap:TradingRevenueMemberus-gaap:DepositsMember2020-01-012020-06-300000895421us-gaap:DepositsMemberus-gaap:OtherComprehensiveIncomeMember2020-01-012020-06-300000895421us-gaap:DebtMemberus-gaap:OtherComprehensiveIncomeMember2021-01-012021-06-300000895421us-gaap:DebtMemberus-gaap:OtherComprehensiveIncomeMember2020-01-012020-06-300000895421us-gaap:OverTheCounterMemberus-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ExchangeClearedMember2021-06-300000895421us-gaap:ExchangeTradedMemberus-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:OverTheCounterMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ExchangeClearedMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:ExchangeTradedMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-06-300000895421us-gaap:OverTheCounterMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-06-300000895421us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ExchangeClearedMember2021-06-300000895421us-gaap:ExchangeTradedMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-06-300000895421us-gaap:DesignatedAsHedgingInstrumentMember2021-06-300000895421us-gaap:CreditRiskContractMemberus-gaap:OverTheCounterMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2021-06-300000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberus-gaap:ExchangeClearedMember2021-06-300000895421us-gaap:CreditRiskContractMemberus-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2021-06-300000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2021-06-300000895421us-gaap:OverTheCounterMemberus-gaap:InterestRateContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ExchangeClearedMember2021-06-300000895421us-gaap:ExchangeTradedMemberus-gaap:InterestRateContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421us-gaap:InterestRateContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421us-gaap:CreditRiskContractMemberus-gaap:OverTheCounterMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ExchangeClearedMember2021-06-300000895421us-gaap:CreditRiskContractMemberus-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:OverTheCounterMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ExchangeClearedMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421us-gaap:EquityContractMemberus-gaap:OverTheCounterMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421us-gaap:EquityContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ExchangeClearedMember2021-06-300000895421us-gaap:EquityContractMemberus-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421us-gaap:EquityContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421ms:CommodityAndOtherContractsMemberus-gaap:OverTheCounterMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421ms:CommodityAndOtherContractsMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ExchangeClearedMember2021-06-300000895421ms:CommodityAndOtherContractsMemberus-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421ms:CommodityAndOtherContractsMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2021-06-300000895421us-gaap:NondesignatedMemberus-gaap:OverTheCounterMember2021-06-300000895421us-gaap:NondesignatedMemberus-gaap:ExchangeClearedMember2021-06-300000895421us-gaap:NondesignatedMemberus-gaap:ExchangeTradedMember2021-06-300000895421us-gaap:NondesignatedMember2021-06-300000895421us-gaap:OverTheCounterMember2021-06-300000895421us-gaap:ExchangeClearedMember2021-06-300000895421us-gaap:ExchangeTradedMember2021-06-300000895421us-gaap:OverTheCounterMemberus-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:OverTheCounterMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:ExchangeTradedMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000895421us-gaap:OverTheCounterMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:OverTheCounterMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2020-12-310000895421us-gaap:OverTheCounterMemberus-gaap:InterestRateContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:InterestRateContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:OverTheCounterMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:OverTheCounterMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421us-gaap:EquityContractMemberus-gaap:OverTheCounterMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421us-gaap:EquityContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:EquityContractMemberus-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421us-gaap:EquityContractMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:OverTheCounterMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ExchangeClearedMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMember2020-12-310000895421us-gaap:NondesignatedMemberus-gaap:OverTheCounterMember2020-12-310000895421us-gaap:NondesignatedMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:NondesignatedMemberus-gaap:ExchangeTradedMember2020-12-310000895421us-gaap:NondesignatedMember2020-12-310000895421us-gaap:OverTheCounterMember2020-12-310000895421us-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMember2020-12-310000895421us-gaap:FairValueHedgingMemberus-gaap:InterestRateContractMemberus-gaap:InterestIncomeMember2021-04-012021-06-300000895421us-gaap:FairValueHedgingMemberus-gaap:InterestRateContractMemberus-gaap:InterestIncomeMember2020-04-012020-06-300000895421us-gaap:FairValueHedgingMemberus-gaap:InterestRateContractMemberus-gaap:InterestIncomeMember2021-01-012021-06-300000895421us-gaap:FairValueHedgingMemberus-gaap:InterestRateContractMemberus-gaap:InterestIncomeMember2020-01-012020-06-300000895421us-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueHedgingMemberus-gaap:InterestIncomeMember2021-04-012021-06-300000895421us-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueHedgingMemberus-gaap:InterestIncomeMember2020-04-012020-06-300000895421us-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueHedgingMemberus-gaap:InterestIncomeMember2021-01-012021-06-300000895421us-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueHedgingMemberus-gaap:InterestIncomeMember2020-01-012020-06-300000895421us-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMemberus-gaap:InterestRateContractMember2021-04-012021-06-300000895421us-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMemberus-gaap:InterestRateContractMember2020-04-012020-06-300000895421us-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMemberus-gaap:InterestRateContractMember2021-01-012021-06-300000895421us-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMemberus-gaap:InterestRateContractMember2020-01-012020-06-300000895421us-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMemberus-gaap:DepositsMember2021-04-012021-06-300000895421us-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMemberus-gaap:DepositsMember2020-04-012020-06-300000895421us-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMemberus-gaap:DepositsMember2021-01-012021-06-300000895421us-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMemberus-gaap:DepositsMember2020-01-012020-06-300000895421us-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMemberus-gaap:BorrowingsMember2021-04-012021-06-300000895421us-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMemberus-gaap:BorrowingsMember2020-04-012020-06-300000895421us-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMemberus-gaap:BorrowingsMember2021-01-012021-06-300000895421us-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMemberus-gaap:BorrowingsMember2020-01-012020-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:NetInvestmentHedgingMember2021-04-012021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:NetInvestmentHedgingMember2020-04-012020-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:NetInvestmentHedgingMember2021-01-012021-06-300000895421us-gaap:ForeignExchangeContractMemberus-gaap:NetInvestmentHedgingMember2020-01-012020-06-300000895421us-gaap:AvailableforsaleSecuritiesMember2021-06-300000895421us-gaap:AvailableforsaleSecuritiesMember2020-12-310000895421us-gaap:DepositsMember2021-06-300000895421us-gaap:DepositsMember2020-12-310000895421us-gaap:BorrowingsMember2021-06-300000895421us-gaap:BorrowingsMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2021-04-012021-06-300000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2020-04-012020-06-300000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2021-01-012021-06-300000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2020-01-012020-06-300000895421ms:DerivativeCreditRiskRelatedContingentFeaturesTriggeringCircumstancesOneNotchCreditRatingDowngradeMember2021-06-300000895421ms:DerivativeCreditRiskRelatedContingentFeaturestriggeringCircumstancesTwoNotchCreditRatingDowngradeMember2021-06-300000895421us-gaap:CollaborativeArrangementMember2021-06-300000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421ms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberus-gaap:InternalNoninvestmentGradeMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberus-gaap:InternalNoninvestmentGradeMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2021-06-300000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2021-06-300000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2021-06-300000895421ms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2021-06-300000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421ms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberus-gaap:InternalNoninvestmentGradeMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberus-gaap:InternalNoninvestmentGradeMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421us-gaap:CreditDefaultSwapMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421us-gaap:CreditDefaultSwapMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421us-gaap:CreditDefaultSwapMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421us-gaap:CreditDefaultSwapMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421us-gaap:CreditDefaultSwapMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2021-06-300000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2021-06-300000895421ms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2021-06-300000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:CreditDerivativesSellingProtectionMember2021-06-300000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421ms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2020-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberus-gaap:InternalNoninvestmentGradeMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2020-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberus-gaap:InternalNoninvestmentGradeMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2020-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2020-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2020-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2020-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2020-12-310000895421ms:CreditDerivativesSellingProtectionMemberms:SingleNameCreditDefaultSwapMember2020-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421ms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberus-gaap:InternalNoninvestmentGradeMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberus-gaap:InternalNoninvestmentGradeMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:TotalIndexAndBasketCreditDefaultSwapsMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:CreditDefaultSwapMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:CreditDefaultSwapMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:CreditDefaultSwapMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:CreditDefaultSwapMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:CreditDefaultSwapMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2020-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2020-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2020-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2020-12-310000895421ms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2020-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:CreditDefaultSwapBuyingProtectionMemberms:SingleNameCreditDefaultSwapMember2021-06-300000895421us-gaap:CreditDefaultSwapBuyingProtectionMemberms:SingleNameCreditDefaultSwapMember2020-12-310000895421us-gaap:CreditDefaultSwapBuyingProtectionMemberms:IndexAndBasketCreditDefaultSwapMember2021-06-300000895421us-gaap:CreditDefaultSwapBuyingProtectionMemberms:IndexAndBasketCreditDefaultSwapMember2020-12-310000895421us-gaap:CreditDefaultSwapBuyingProtectionMemberms:TranchedIndexAndBasketCreditDefaultSwapMember2021-06-300000895421us-gaap:CreditDefaultSwapBuyingProtectionMemberms:TranchedIndexAndBasketCreditDefaultSwapMember2020-12-310000895421us-gaap:CreditDefaultSwapBuyingProtectionMember2021-06-300000895421us-gaap:CreditDefaultSwapBuyingProtectionMember2020-12-310000895421us-gaap:CreditDefaultSwapMemberus-gaap:CreditDefaultSwapBuyingProtectionMember2021-06-300000895421us-gaap:CreditDefaultSwapMemberus-gaap:CreditDefaultSwapBuyingProtectionMember2020-12-310000895421us-gaap:USTreasurySecuritiesMember2021-06-300000895421us-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-06-300000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2021-06-300000895421us-gaap:USStatesAndPoliticalSubdivisionsMember2021-06-300000895421ms:AssetBackedSecuritiesFederalFamilyEducationLoanProgramMember2021-06-300000895421us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2021-06-300000895421us-gaap:USTreasurySecuritiesMember2020-12-310000895421us-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-12-310000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-12-310000895421us-gaap:CorporateBondSecuritiesMember2020-12-310000895421us-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000895421ms:AssetBackedSecuritiesFederalFamilyEducationLoanProgramMember2020-12-310000895421ms:AssetBackedSecuritiesOtherMember2020-12-310000895421us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2020-12-310000895421us-gaap:CorporateBondSecuritiesMember2021-06-300000895421us-gaap:USTreasurySecuritiesMember2021-01-012021-06-300000895421us-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-01-012021-06-300000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2021-01-012021-06-300000895421us-gaap:USStatesAndPoliticalSubdivisionsMember2021-01-012021-06-300000895421ms:AssetBackedSecuritiesFederalFamilyEducationLoanProgramMember2021-01-012021-06-300000895421us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2021-01-012021-06-300000895421us-gaap:MaturityOvernightMember2021-06-300000895421us-gaap:MaturityUpTo30DaysMember2021-06-300000895421us-gaap:Maturity30To90DaysMember2021-06-300000895421us-gaap:MaturityOver90DaysMember2021-06-300000895421us-gaap:MaturityOvernightMember2020-12-310000895421us-gaap:MaturityUpTo30DaysMember2020-12-310000895421us-gaap:Maturity30To90DaysMember2020-12-310000895421us-gaap:MaturityOver90DaysMember2020-12-310000895421us-gaap:USTreasuryAndGovernmentMember2021-06-300000895421us-gaap:USTreasuryAndGovernmentMember2020-12-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMember2021-06-300000895421us-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000895421ms:CorporateEquitiesMember2021-06-300000895421ms:CorporateEquitiesMember2020-12-310000895421us-gaap:CollateralizedSecuritiesOtherMember2021-06-300000895421us-gaap:CollateralizedSecuritiesOtherMember2020-12-310000895421us-gaap:CommercialPortfolioSegmentMember2021-06-300000895421ms:SecuredLendingFacilitiesMember2021-06-300000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2021-06-300000895421us-gaap:ResidentialPortfolioSegmentMember2021-06-300000895421ms:SecuritiesBasedLendingandOtherLoansMember2021-06-300000895421us-gaap:CommercialPortfolioSegmentMember2020-12-310000895421ms:SecuredLendingFacilitiesMember2020-12-310000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2020-12-310000895421us-gaap:ResidentialPortfolioSegmentMember2020-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMember2020-12-310000895421us-gaap:CommercialPortfolioSegmentMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberus-gaap:CommercialPortfolioSegmentMember2021-06-300000895421us-gaap:CommercialPortfolioSegmentMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberus-gaap:CommercialPortfolioSegmentMember2020-12-310000895421ms:SecuredLendingFacilitiesMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421ms:SecuredLendingFacilitiesMemberus-gaap:InternalNoninvestmentGradeMember2021-06-300000895421ms:SecuredLendingFacilitiesMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421ms:SecuredLendingFacilitiesMemberus-gaap:InternalNoninvestmentGradeMember2020-12-310000895421us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2021-06-300000895421us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2020-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberms:FICOScoreGreaterthanorEqualto740Member2021-06-300000895421ms:FICOScoreBetween680and739Memberus-gaap:ResidentialPortfolioSegmentMember2021-06-300000895421us-gaap:ResidentialPortfolioSegmentMemberms:FICOScoreLessthan680Member2021-06-300000895421us-gaap:ResidentialPortfolioSegmentMemberms:DebttoValueRatioLessthanorEqualto80PercentMember2021-06-300000895421ms:DebttoValueRatioGreaterthan80PercentMemberus-gaap:ResidentialPortfolioSegmentMember2021-06-300000895421us-gaap:ResidentialPortfolioSegmentMemberms:FICOScoreGreaterthanorEqualto740Member2020-12-310000895421ms:FICOScoreBetween680and739Memberus-gaap:ResidentialPortfolioSegmentMember2020-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberms:FICOScoreLessthan680Member2020-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberms:DebttoValueRatioLessthanorEqualto80PercentMember2020-12-310000895421ms:DebttoValueRatioGreaterthan80PercentMemberus-gaap:ResidentialPortfolioSegmentMember2020-12-310000895421ms:SecuritiesBasedLendingMember2021-06-300000895421ms:OtherLoansMemberus-gaap:InternalInvestmentGradeMember2021-06-300000895421ms:OtherLoansMemberus-gaap:InternalNoninvestmentGradeMember2021-06-300000895421ms:SecuritiesBasedLendingMember2020-12-310000895421ms:OtherLoansMemberus-gaap:InternalInvestmentGradeMember2020-12-310000895421ms:OtherLoansMemberus-gaap:InternalNoninvestmentGradeMember2020-12-310000895421ms:FinancialAssetPastDueMinusCurrentMemberus-gaap:ResidentialPortfolioSegmentMember2021-06-300000895421ms:FinancialAssetPastDueMinusCurrentMemberus-gaap:ResidentialPortfolioSegmentMember2020-12-310000895421ms:FinancialAssetPastDueMinusCurrentMemberms:SecuritiesBasedLendingandOtherLoansMember2021-06-300000895421ms:FinancialAssetPastDueMinusCurrentMemberms:SecuritiesBasedLendingandOtherLoansMember2020-12-310000895421ms:FinancialAssetPastDueMinusCurrentMember2021-06-300000895421ms:FinancialAssetPastDueMinusCurrentMember2020-12-310000895421us-gaap:CommercialPortfolioSegmentMember2021-01-012021-06-300000895421ms:SecuredLendingFacilitiesMember2021-01-012021-06-300000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2021-01-012021-06-300000895421us-gaap:ResidentialPortfolioSegmentMember2021-01-012021-06-300000895421ms:SecuritiesBasedLendingandOtherLoansMember2021-01-012021-06-300000895421us-gaap:CommercialPortfolioSegmentMember2019-12-310000895421ms:SecuredLendingFacilitiesMember2019-12-310000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000895421us-gaap:ResidentialPortfolioSegmentMember2019-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMember2019-12-310000895421us-gaap:CommercialPortfolioSegmentMember2020-01-012020-06-300000895421ms:SecuredLendingFacilitiesMember2020-01-012020-06-300000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2020-01-012020-06-300000895421us-gaap:ResidentialPortfolioSegmentMember2020-01-012020-06-300000895421ms:SecuritiesBasedLendingandOtherLoansMember2020-01-012020-06-300000895421us-gaap:CommercialPortfolioSegmentMember2020-06-300000895421ms:SecuredLendingFacilitiesMember2020-06-300000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2020-06-300000895421us-gaap:ResidentialPortfolioSegmentMember2020-06-300000895421ms:SecuritiesBasedLendingandOtherLoansMember2020-06-300000895421ms:CurrentlyEmployedbytheFirmMember2021-06-300000895421ms:CurrentlyEmployedbytheFirmMember2020-12-310000895421ms:NoLongerEmployedbytheFirmMember2021-06-300000895421ms:NoLongerEmployedbytheFirmMember2020-12-3100008954212020-01-012020-12-310000895421ms:InvestmentManagementSegmentMember2021-06-300000895421ms:InvestmentManagementSegmentMember2020-12-310000895421ms:InvestmentManagementSegmentMember2021-04-012021-06-300000895421ms:InvestmentManagementSegmentMember2020-04-012020-06-300000895421ms:InvestmentManagementSegmentMember2021-01-012021-06-300000895421ms:InvestmentManagementSegmentMember2020-01-012020-06-300000895421ms:MitsubishiUfjMorganStanleySecuritiesCoLtdMember2021-04-012021-06-300000895421ms:MitsubishiUfjMorganStanleySecuritiesCoLtdMember2020-04-012020-06-300000895421ms:MitsubishiUfjMorganStanleySecuritiesCoLtdMember2021-01-012021-06-300000895421ms:MitsubishiUfjMorganStanleySecuritiesCoLtdMember2020-01-012020-06-300000895421us-gaap:CommercialLoanMember2021-06-300000895421ms:SecuredLendingFacilitiesMember2021-06-300000895421us-gaap:RealEstateMember2021-06-300000895421ms:SecuritiesBasedLendingandOtherLoansMember2021-06-300000895421ms:CommitmentsForwardStartingReverseRepurchaseAgreementsMember2021-06-300000895421ms:CentralCounterpartyCommitmentMember2021-06-300000895421ms:FirmCommitmentContractMember2021-06-300000895421ms:CommitmentsInvestmentActivitiesMember2021-06-300000895421ms:CommitmentsLettersOfCreditAndOtherFinancialGuaranteesObtainedToSatisfyCollateralRequirementsMember2021-06-300000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberus-gaap:DerivativeMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberus-gaap:DerivativeMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberus-gaap:DerivativeMember2021-06-300000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberus-gaap:DerivativeMember2021-06-300000895421us-gaap:DerivativeMember2021-06-300000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberus-gaap:StandbyLettersOfCreditMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberus-gaap:StandbyLettersOfCreditMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberus-gaap:StandbyLettersOfCreditMember2021-06-300000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberus-gaap:StandbyLettersOfCreditMember2021-06-300000895421us-gaap:StandbyLettersOfCreditMember2021-06-300000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberus-gaap:MarketValueGuaranteeMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberus-gaap:MarketValueGuaranteeMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberus-gaap:MarketValueGuaranteeMember2021-06-300000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberus-gaap:MarketValueGuaranteeMember2021-06-300000895421us-gaap:MarketValueGuaranteeMember2021-06-300000895421ms:LiquidityFacilitiesGuaranteeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:LiquidityFacilitiesGuaranteeMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:LiquidityFacilitiesGuaranteeMember2021-06-300000895421ms:LiquidityFacilitiesGuaranteeMemberms:MoreThanFiveYearsFromBalanceSheetDateMember2021-06-300000895421ms:LiquidityFacilitiesGuaranteeMember2021-06-300000895421ms:WholeLoanSalesRepresentationsAndWarrantiesMemberms:LessThanTwelveMonthsFromBalanceSheetDateMember2021-06-300000895421ms:WholeLoanSalesRepresentationsAndWarrantiesMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMember2021-06-300000895421ms:WholeLoanSalesRepresentationsAndWarrantiesMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMember2021-06-300000895421ms:WholeLoanSalesRepresentationsAndWarrantiesMemberms:MoreThanFiveYearsFromBalanceSheetDateMember2021-06-300000895421ms:WholeLoanSalesRepresentationsAndWarrantiesMember2021-06-300000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:SecuritizationsRepresentationsAndGuaranteesMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:SecuritizationsRepresentationsAndGuaranteesMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:SecuritizationsRepresentationsAndGuaranteesMember2021-06-300000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:SecuritizationsRepresentationsAndGuaranteesMember2021-06-300000895421ms:SecuritizationsRepresentationsAndGuaranteesMember2021-06-300000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:GeneralPartnerGuaranteeMember2021-06-300000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:GeneralPartnerGuaranteeMember2021-06-300000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:GeneralPartnerGuaranteeMember2021-06-300000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:GeneralPartnerGuaranteeMember2021-06-300000895421ms:GeneralPartnerGuaranteeMember2021-06-300000895421ms:ClearingMemberGuaranteeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMember2021-06-300000895421ms:ClearingMemberGuaranteeMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMember2021-06-300000895421ms:ClearingMemberGuaranteeMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMember2021-06-300000895421ms:ClearingMemberGuaranteeMemberms:MoreThanFiveYearsFromBalanceSheetDateMember2021-06-300000895421ms:ClearingMemberGuaranteeMember2021-06-300000895421ms:FinancialGuarantyInsuranceCompanyVMorganStanleyAbsCapitalIIncEtAlTrust2007Nc4Memberus-gaap:PendingLitigationMember2021-06-300000895421us-gaap:PendingLitigationMembersrt:MaximumMemberms:DeutscheBankNationalTrustCompany2007Nc4VMorganStanleyMortgageCapitalHoldingsLlcMember2021-06-300000895421ms:UsBankNationalAssociation20072axVMorganStanleyMortgageCapitalHoldingsLlcMemberus-gaap:PendingLitigationMember2021-06-30iso4217:EUR0000895421ms:CaseNumber153637AndCaseNumber154353Memberus-gaap:PendingLitigationMember2021-06-300000895421us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CollateralizedLoanObligationsMember2021-06-300000895421us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberus-gaap:CollateralizedLoanObligationsMember2020-12-310000895421us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421ms:OtherVariableInterestsMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2021-06-300000895421ms:OtherVariableInterestsMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-12-310000895421us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2021-06-300000895421us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-12-310000895421ms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:CollateralizedDebtObligationsMember2021-06-300000895421ms:MunicipalTenderOptionBondsMember2021-06-300000895421us-gaap:StructuredFinanceMember2021-06-300000895421ms:OtherVariableInterestsMember2021-06-300000895421ms:DebtandEquityInterestsMemberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:CollateralizedDebtObligationsMemberms:DebtandEquityInterestsMember2021-06-300000895421ms:DebtandEquityInterestsMemberms:MunicipalTenderOptionBondsMember2021-06-300000895421us-gaap:StructuredFinanceMemberms:DebtandEquityInterestsMember2021-06-300000895421ms:OtherVariableInterestsMemberms:DebtandEquityInterestsMember2021-06-300000895421us-gaap:DerivativeFinancialInstrumentsAssetsMemberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2021-06-300000895421ms:MunicipalTenderOptionBondsMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2021-06-300000895421us-gaap:StructuredFinanceMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2021-06-300000895421ms:OtherVariableInterestsMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2021-06-300000895421ms:CommitmentsGuaranteesAndOtherMemberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421ms:CommitmentsGuaranteesAndOtherMemberus-gaap:CollateralizedDebtObligationsMember2021-06-300000895421ms:CommitmentsGuaranteesAndOtherMemberms:MunicipalTenderOptionBondsMember2021-06-300000895421ms:CommitmentsGuaranteesAndOtherMemberus-gaap:StructuredFinanceMember2021-06-300000895421ms:CommitmentsGuaranteesAndOtherMemberms:OtherVariableInterestsMember2021-06-300000895421ms:DebtandEquityInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:CollateralizedDebtObligationsMemberms:DebtandEquityInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421ms:DebtandEquityInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MunicipalTenderOptionBondsMember2021-06-300000895421us-gaap:StructuredFinanceMemberms:DebtandEquityInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421ms:OtherVariableInterestsMemberms:DebtandEquityInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2021-06-300000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MunicipalTenderOptionBondsMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2021-06-300000895421us-gaap:StructuredFinanceMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2021-06-300000895421ms:OtherVariableInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2021-06-300000895421us-gaap:AssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:AssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421us-gaap:AssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MunicipalTenderOptionBondsMember2021-06-300000895421us-gaap:StructuredFinanceMemberus-gaap:AssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421ms:OtherVariableInterestsMemberus-gaap:AssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberms:MortgageAndAssetBackedSecuritiesMember2021-06-300000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2021-06-300000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MunicipalTenderOptionBondsMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2021-06-300000895421us-gaap:StructuredFinanceMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2021-06-300000895421ms:OtherVariableInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2021-06-300000895421ms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:CollateralizedDebtObligationsMember2020-12-310000895421ms:MunicipalTenderOptionBondsMember2020-12-310000895421us-gaap:StructuredFinanceMember2020-12-310000895421ms:OtherVariableInterestsMember2020-12-310000895421ms:DebtandEquityInterestsMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:CollateralizedDebtObligationsMemberms:DebtandEquityInterestsMember2020-12-310000895421ms:DebtandEquityInterestsMemberms:MunicipalTenderOptionBondsMember2020-12-310000895421us-gaap:StructuredFinanceMemberms:DebtandEquityInterestsMember2020-12-310000895421ms:OtherVariableInterestsMemberms:DebtandEquityInterestsMember2020-12-310000895421us-gaap:DerivativeFinancialInstrumentsAssetsMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2020-12-310000895421ms:MunicipalTenderOptionBondsMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2020-12-310000895421us-gaap:StructuredFinanceMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2020-12-310000895421ms:OtherVariableInterestsMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2020-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberus-gaap:CollateralizedDebtObligationsMember2020-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberms:MunicipalTenderOptionBondsMember2020-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberus-gaap:StructuredFinanceMember2020-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberms:OtherVariableInterestsMember2020-12-310000895421ms:DebtandEquityInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:CollateralizedDebtObligationsMemberms:DebtandEquityInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421ms:DebtandEquityInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MunicipalTenderOptionBondsMember2020-12-310000895421us-gaap:StructuredFinanceMemberms:DebtandEquityInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421ms:OtherVariableInterestsMemberms:DebtandEquityInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MunicipalTenderOptionBondsMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2020-12-310000895421us-gaap:StructuredFinanceMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2020-12-310000895421ms:OtherVariableInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2020-12-310000895421us-gaap:AssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:AssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421us-gaap:AssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MunicipalTenderOptionBondsMember2020-12-310000895421us-gaap:StructuredFinanceMemberus-gaap:AssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421ms:OtherVariableInterestsMemberus-gaap:AssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MunicipalTenderOptionBondsMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2020-12-310000895421us-gaap:StructuredFinanceMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2020-12-310000895421ms:OtherVariableInterestsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2020-12-310000895421us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:SecuritiesAssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421us-gaap:ResidentialMortgageBackedSecuritiesMemberus-gaap:SecuritiesAssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:CommercialMortgageBackedSecuritiesMember2021-06-300000895421us-gaap:SecuritiesAssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:CommercialMortgageBackedSecuritiesMember2021-06-300000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310000895421us-gaap:SecuritiesAssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:SecuritiesAssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:SecuritiesAssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421ms:OtherConsumerAndCommercialLoansMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421us-gaap:SecuritiesAssetsMemberms:OtherConsumerAndCommercialLoansMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421ms:OtherConsumerAndCommercialLoansMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421us-gaap:SecuritiesAssetsMemberms:OtherConsumerAndCommercialLoansMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421us-gaap:SecuritiesAssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-06-300000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421us-gaap:SecuritiesAssetsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421us-gaap:ResidentialMortgageMemberms:SpecialPurposeEntitiesMember2021-06-300000895421ms:SpecialPurposeEntitiesMemberus-gaap:CommercialMortgageBackedSecuritiesMember2021-06-300000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberms:SpecialPurposeEntitiesMember2021-06-300000895421ms:CreditLinkedNotesAndOtherMemberms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:InternalInvestmentGradeMemberus-gaap:ResidentialMortgageMemberms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:InternalInvestmentGradeMemberms:SpecialPurposeEntitiesMemberus-gaap:CommercialMortgageBackedSecuritiesMember2021-06-300000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:InternalInvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-06-300000895421ms:CreditLinkedNotesAndOtherMemberus-gaap:InternalInvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberus-gaap:ResidentialMortgageMemberms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberms:SpecialPurposeEntitiesMemberus-gaap:CommercialMortgageBackedSecuritiesMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberms:SpecialPurposeEntitiesMember2021-06-300000895421ms:CreditLinkedNotesAndOtherMemberus-gaap:InternalNoninvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:ResidentialMortgageMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:SpecialPurposeEntitiesMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:CreditLinkedNotesAndOtherMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:InternalInvestmentGradeMemberus-gaap:ResidentialMortgageMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:InternalInvestmentGradeMemberms:SpecialPurposeEntitiesMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:InternalInvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:CreditLinkedNotesAndOtherMemberus-gaap:InternalInvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberus-gaap:ResidentialMortgageMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:SpecialPurposeEntitiesMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:CreditLinkedNotesAndOtherMemberus-gaap:InternalNoninvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:InternalInvestmentGradeMemberus-gaap:FairValueInputsLevel2Memberms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InternalInvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:InternalInvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberus-gaap:FairValueInputsLevel2Memberms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberus-gaap:FairValueInputsLevel3Memberms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:InternalNoninvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:FairValueInputsLevel2Memberms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:FairValueInputsLevel3Memberms:SpecialPurposeEntitiesMember2021-06-300000895421ms:SpecialPurposeEntitiesMember2021-06-300000895421us-gaap:InternalInvestmentGradeMemberus-gaap:FairValueInputsLevel2Memberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InternalInvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:InternalInvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberus-gaap:FairValueInputsLevel2Memberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberus-gaap:FairValueInputsLevel3Memberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:FairValueInputsLevel2Memberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:SpecialPurposeEntitiesMember2020-12-310000895421ms:CollateralizedLoanObligationsEntitiesSponsoredByNonAffiliatesMemberus-gaap:CommercialLoanMember2021-04-012021-06-300000895421ms:CollateralizedLoanObligationsEntitiesSponsoredByNonAffiliatesMemberus-gaap:CommercialLoanMember2020-04-012020-06-300000895421ms:CollateralizedLoanObligationsEntitiesSponsoredByNonAffiliatesMemberus-gaap:CommercialLoanMember2021-01-012021-06-300000895421ms:CollateralizedLoanObligationsEntitiesSponsoredByNonAffiliatesMemberus-gaap:CommercialLoanMember2020-01-012020-06-300000895421us-gaap:OverTheCounterMemberus-gaap:EquityContractMember2021-06-300000895421us-gaap:OverTheCounterMemberus-gaap:EquityContractMember2020-12-310000895421srt:MaximumMember2021-06-300000895421ms:MorganStanleyBankNationalAssociationMember2021-01-012021-06-300000895421ms:MorganStanleyBankNationalAssociationMember2021-06-300000895421ms:MorganStanleyBankNationalAssociationMember2020-12-310000895421ms:MorganStanleyPrivateBankNationalAssociationMember2021-01-012021-06-300000895421ms:MorganStanleyPrivateBankNationalAssociationMember2021-06-300000895421ms:MorganStanleyPrivateBankNationalAssociationMember2020-12-310000895421ms:MSAndCoMember2021-01-012021-06-300000895421ms:MSAndCoMember2021-06-300000895421ms:MSAndCoMember2020-12-310000895421us-gaap:SeriesAPreferredStockMember2021-06-300000895421us-gaap:SeriesAPreferredStockMember2020-12-310000895421us-gaap:SeriesCPreferredStockMember2021-06-300000895421us-gaap:SeriesCPreferredStockMember2020-12-310000895421us-gaap:SeriesEPreferredStockMember2021-06-300000895421us-gaap:SeriesEPreferredStockMember2020-12-310000895421us-gaap:SeriesFPreferredStockMember2021-06-300000895421us-gaap:SeriesFPreferredStockMember2020-12-310000895421us-gaap:SeriesHPreferredStockMember2021-06-300000895421us-gaap:SeriesHPreferredStockMember2020-12-310000895421ms:SeriesIPreferredStockMember2021-06-300000895421ms:SeriesIPreferredStockMember2020-12-310000895421ms:SeriesJPreferredStockMember2021-06-300000895421ms:SeriesJPreferredStockMember2020-12-310000895421ms:SeriesKPreferredStockMember2021-06-300000895421ms:SeriesKPreferredStockMember2020-12-310000895421ms:SeriesLPreferredStockMember2021-06-300000895421ms:SeriesLPreferredStockMember2020-12-310000895421ms:SeriesMPreferredStockMember2021-06-300000895421ms:SeriesMPreferredStockMember2020-12-310000895421ms:SeriesNPreferredStockMember2021-06-300000895421ms:SeriesNPreferredStockMember2020-12-310000895421ms:SeriesJPreferredStockMember2021-03-152021-03-1500008954212021-06-280000895421us-gaap:SeriesAPreferredStockMember2021-04-012021-06-300000895421us-gaap:SeriesAPreferredStockMember2020-04-012020-06-300000895421us-gaap:SeriesCPreferredStockMember2021-04-012021-06-300000895421us-gaap:SeriesCPreferredStockMember2020-04-012020-06-300000895421us-gaap:SeriesEPreferredStockMember2021-04-012021-06-300000895421us-gaap:SeriesEPreferredStockMember2020-04-012020-06-300000895421us-gaap:SeriesFPreferredStockMember2021-04-012021-06-300000895421us-gaap:SeriesFPreferredStockMember2020-04-012020-06-300000895421us-gaap:SeriesHPreferredStockMember2021-04-012021-06-300000895421us-gaap:SeriesHPreferredStockMember2020-04-012020-06-300000895421ms:SeriesIPreferredStockMember2021-04-012021-06-300000895421ms:SeriesIPreferredStockMember2020-04-012020-06-300000895421ms:SeriesJPreferredStockMember2021-04-012021-06-300000895421ms:SeriesJPreferredStockMember2020-04-012020-06-300000895421ms:SeriesKPreferredStockMember2021-04-012021-06-300000895421ms:SeriesKPreferredStockMember2020-04-012020-06-300000895421ms:SeriesLPreferredStockMember2021-04-012021-06-300000895421ms:SeriesLPreferredStockMember2020-04-012020-06-300000895421us-gaap:SeriesAPreferredStockMember2020-01-012020-06-300000895421us-gaap:SeriesCPreferredStockMember2021-01-012021-06-300000895421us-gaap:SeriesCPreferredStockMember2020-01-012020-06-300000895421us-gaap:SeriesEPreferredStockMember2020-01-012020-06-300000895421us-gaap:SeriesFPreferredStockMember2020-01-012020-06-300000895421us-gaap:SeriesHPreferredStockMember2021-01-012021-06-300000895421us-gaap:SeriesHPreferredStockMember2020-01-012020-06-300000895421ms:SeriesIPreferredStockMember2020-01-012020-06-300000895421ms:SeriesJPreferredStockMember2021-01-012021-06-300000895421ms:SeriesJPreferredStockMember2020-01-012020-06-300000895421ms:SeriesKPreferredStockMember2020-01-012020-06-300000895421ms:SeriesLPreferredStockMember2020-01-012020-06-300000895421ms:SeriesMPreferredStockMember2021-01-012021-06-300000895421ms:SeriesMPreferredStockMember2020-01-012020-06-300000895421ms:SeriesNPreferredStockMember2021-01-012021-06-300000895421ms:SeriesNPreferredStockMember2020-01-012020-06-300000895421us-gaap:AccumulatedTranslationAdjustmentMember2021-03-310000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-03-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-03-310000895421ms:AOCIDebtValuationAdjustmentParentMember2021-03-310000895421us-gaap:AccumulatedTranslationAdjustmentMember2021-04-012021-06-300000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-04-012021-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-04-012021-06-300000895421ms:AOCIDebtValuationAdjustmentParentMember2021-04-012021-06-300000895421us-gaap:AccumulatedTranslationAdjustmentMember2021-06-300000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-06-300000895421ms:AOCIDebtValuationAdjustmentParentMember2021-06-300000895421us-gaap:AccumulatedTranslationAdjustmentMember2020-03-310000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-03-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-03-310000895421ms:AOCIDebtValuationAdjustmentParentMember2020-03-310000895421us-gaap:AccumulatedTranslationAdjustmentMember2020-04-012020-06-300000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-04-012020-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-04-012020-06-300000895421ms:AOCIDebtValuationAdjustmentParentMember2020-04-012020-06-300000895421us-gaap:AccumulatedTranslationAdjustmentMember2020-06-300000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-06-300000895421ms:AOCIDebtValuationAdjustmentParentMember2020-06-300000895421us-gaap:AccumulatedTranslationAdjustmentMember2020-12-310000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310000895421ms:AOCIDebtValuationAdjustmentParentMember2020-12-310000895421us-gaap:AccumulatedTranslationAdjustmentMember2021-01-012021-06-300000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-01-012021-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-01-012021-06-300000895421ms:AOCIDebtValuationAdjustmentParentMember2021-01-012021-06-300000895421us-gaap:AccumulatedTranslationAdjustmentMember2019-12-310000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2019-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-310000895421ms:AOCIDebtValuationAdjustmentParentMember2019-12-310000895421us-gaap:AccumulatedTranslationAdjustmentMember2020-01-012020-06-300000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-01-012020-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-01-012020-06-300000895421ms:AOCIDebtValuationAdjustmentParentMember2020-01-012020-06-300000895421us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2021-04-012021-06-300000895421us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember2021-04-012021-06-300000895421us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2021-04-012021-06-300000895421us-gaap:AccumulatedNetInvestmentGainLossAttributableToNoncontrollingInterestMember2021-04-012021-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2021-04-012021-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember2021-04-012021-06-300000895421ms:AOCIDebtValuationAdjustmentIncludingNoncontrollingInterestMember2021-04-012021-06-300000895421ms:AOCIDebtValuationAdjustmentNoncontrollingInterestMember2021-04-012021-06-300000895421us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2020-04-012020-06-300000895421us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember2020-04-012020-06-300000895421us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2020-04-012020-06-300000895421us-gaap:AccumulatedNetInvestmentGainLossAttributableToNoncontrollingInterestMember2020-04-012020-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2020-04-012020-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember2020-04-012020-06-300000895421ms:AOCIDebtValuationAdjustmentIncludingNoncontrollingInterestMember2020-04-012020-06-300000895421ms:AOCIDebtValuationAdjustmentNoncontrollingInterestMember2020-04-012020-06-300000895421us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2021-01-012021-06-300000895421us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember2021-01-012021-06-300000895421us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2021-01-012021-06-300000895421us-gaap:AccumulatedNetInvestmentGainLossAttributableToNoncontrollingInterestMember2021-01-012021-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2021-01-012021-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember2021-01-012021-06-300000895421ms:AOCIDebtValuationAdjustmentIncludingNoncontrollingInterestMember2021-01-012021-06-300000895421ms:AOCIDebtValuationAdjustmentNoncontrollingInterestMember2021-01-012021-06-300000895421us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2020-01-012020-06-300000895421us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember2020-01-012020-06-300000895421us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2020-01-012020-06-300000895421us-gaap:AccumulatedNetInvestmentGainLossAttributableToNoncontrollingInterestMember2020-01-012020-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2020-01-012020-06-300000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember2020-01-012020-06-300000895421ms:AOCIDebtValuationAdjustmentIncludingNoncontrollingInterestMember2020-01-012020-06-300000895421ms:AOCIDebtValuationAdjustmentNoncontrollingInterestMember2020-01-012020-06-300000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000895421ms:WealthManagementSegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000895421ms:InvestmentManagementSegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000895421us-gaap:IntersegmentEliminationMember2021-04-012021-06-300000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMember2020-04-012020-06-300000895421ms:WealthManagementSegmentMemberus-gaap:OperatingSegmentsMember2020-04-012020-06-300000895421ms:InvestmentManagementSegmentMemberus-gaap:OperatingSegmentsMember2020-04-012020-06-300000895421us-gaap:IntersegmentEliminationMember2020-04-012020-06-300000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000895421ms:WealthManagementSegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000895421ms:InvestmentManagementSegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000895421us-gaap:IntersegmentEliminationMember2021-01-012021-06-300000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMember2020-01-012020-06-300000895421ms:WealthManagementSegmentMemberus-gaap:OperatingSegmentsMember2020-01-012020-06-300000895421ms:InvestmentManagementSegmentMemberus-gaap:OperatingSegmentsMember2020-01-012020-06-300000895421us-gaap:IntersegmentEliminationMember2020-01-012020-06-300000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMemberus-gaap:InvestmentAdviceMember2021-04-012021-06-300000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMemberus-gaap:InvestmentAdviceMember2020-04-012020-06-300000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMemberus-gaap:InvestmentAdviceMember2021-01-012021-06-300000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMemberus-gaap:InvestmentAdviceMember2020-01-012020-06-300000895421ms:InstitutionalSecuritiesSegmentMemberms:UnderwritingMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000895421ms:InstitutionalSecuritiesSegmentMemberms:UnderwritingMemberus-gaap:OperatingSegmentsMember2020-04-012020-06-300000895421ms:InstitutionalSecuritiesSegmentMemberms:UnderwritingMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000895421ms:InstitutionalSecuritiesSegmentMemberms:UnderwritingMemberus-gaap:OperatingSegmentsMember2020-01-012020-06-300000895421us-gaap:InterestRateContractMember2021-04-012021-06-300000895421us-gaap:InterestRateContractMember2020-04-012020-06-300000895421us-gaap:InterestRateContractMember2021-01-012021-06-300000895421us-gaap:InterestRateContractMember2020-01-012020-06-300000895421us-gaap:ForeignExchangeContractMember2021-04-012021-06-300000895421us-gaap:ForeignExchangeContractMember2020-04-012020-06-300000895421us-gaap:ForeignExchangeContractMember2021-01-012021-06-300000895421us-gaap:ForeignExchangeContractMember2020-01-012020-06-300000895421ms:EquityAndIndexContractMember2021-04-012021-06-300000895421ms:EquityAndIndexContractMember2020-04-012020-06-300000895421ms:EquityAndIndexContractMember2021-01-012021-06-300000895421ms:EquityAndIndexContractMember2020-01-012020-06-300000895421ms:CommodityAndOtherContractsMember2021-04-012021-06-300000895421ms:CommodityAndOtherContractsMember2020-04-012020-06-300000895421ms:CommodityAndOtherContractsMember2021-01-012021-06-300000895421ms:CommodityAndOtherContractsMember2020-01-012020-06-300000895421us-gaap:CreditRiskContractMember2021-04-012021-06-300000895421us-gaap:CreditRiskContractMember2020-04-012020-06-300000895421us-gaap:CreditRiskContractMember2021-01-012021-06-300000895421us-gaap:CreditRiskContractMember2020-01-012020-06-300000895421srt:AmericasMember2021-04-012021-06-300000895421srt:AmericasMember2020-04-012020-06-300000895421srt:AmericasMember2021-01-012021-06-300000895421srt:AmericasMember2020-01-012020-06-300000895421us-gaap:EMEAMember2021-04-012021-06-300000895421us-gaap:EMEAMember2020-04-012020-06-300000895421us-gaap:EMEAMember2021-01-012021-06-300000895421us-gaap:EMEAMember2020-01-012020-06-300000895421srt:AsiaMember2021-04-012021-06-300000895421srt:AsiaMember2020-04-012020-06-300000895421srt:AsiaMember2021-01-012021-06-300000895421srt:AsiaMember2020-01-012020-06-300000895421ms:InstitutionalSecuritiesSegmentMember2021-06-300000895421ms:InstitutionalSecuritiesSegmentMember2020-12-310000895421ms:WealthManagementSegmentMember2021-06-300000895421ms:WealthManagementSegmentMember2020-12-31

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2021

Commission File Number 1-11758

(Exact name of Registrant as specified in its charter)

 

Delaware

1585 Broadway

36-3145972

(212)

761-4000

(State or other jurisdiction of incorporation or organization)

New York,

NY

10036

(I.R.S. Employer Identification No.)

(Registrant’s telephone number, including area code)

(Address of principal executive offices, including zip code)

Securities registered pursuant to Section 12(b) of the Act:
Title of each class			Trading Symbol(s)			Name of exchange on which registered
Common Stock, $0.01 par value			MS			New York Stock Exchange
Depositary Shares, each representing 1/1,000th interest in a share of Floating Rate			MS/PA			New York Stock Exchange
Non-Cumulative Preferred Stock, Series A, $0.01 par value
Depositary Shares, each representing 1/1,000th interest in a share of Fixed-to-Floating Rate			MS/PE			New York Stock Exchange
Non-Cumulative Preferred Stock, Series E, $0.01 par value
Depositary Shares, each representing 1/1,000th interest in a share of Fixed-to-Floating Rate			MS/PF			New York Stock Exchange
Non-Cumulative Preferred Stock, Series F, $0.01 par value
Depositary Shares, each representing 1/1,000th interest in a share of Fixed-to-Floating Rate			MS/PI			New York Stock Exchange
Non-Cumulative Preferred Stock, Series I, $0.01 par value
Depositary Shares, each representing 1/1,000th interest in a share of Fixed-to-Floating Rate			MS/PK			New York Stock Exchange
Non-Cumulative Preferred Stock, Series K, $0.01 par value
Depository Shares, each representing 1/1000th interest in a share of 4.875%			MS/PL			New York Stock Exchange
Non-Cumulative Preferred Stock, Series L, $0.01 par value
Global Medium-Term Notes, Series A, Fixed Rate Step-Up Senior Notes Due 2026			MS/26C			New York Stock Exchange
of Morgan Stanley Finance LLC (and Registrant’s guarantee with respect thereto)

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒     No  ☐

Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer

☒

Accelerated filer

☐

Non-accelerated filer

☐

Smaller reporting company

☐

Emerging growth company

☐

If an emerging growth company, indicate by check mark if the Registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.         ☐

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No ☒

As of July 30, 2021, there were 1,824,561,070 shares of the Registrant’s Common Stock, par value $0.01 per share, outstanding.

QUARTERLY REPORT ON FORM 10-Q

For the quarter ended June 30, 2021

Table of Contents						Part			Item			Page
Financial Information						I						1
Management’s Discussion and Analysis of Financial Condition and Results of Operations						I			2			1
Introduction												1
Executive Summary												2
Business Segments												7
Institutional Securities												8
Wealth Management												11
Investment Management												14
Supplemental Financial Information												16
Accounting Development Updates												16
Critical Accounting Policies												16
Liquidity and Capital Resources												16
Balance Sheet												16
Regulatory Requirements												20
Quantitative and Qualitative Disclosures about Risk						I			3			26
Market Risk												26
Credit Risk												28
Country and Other Risks												33
Report of Independent Registered Public Accounting Firm												35
Consolidated Financial Statements and Notes						I			1			36
Consolidated Income Statements (Unaudited)												36
Consolidated Comprehensive Income Statements (Unaudited)												36
Consolidated Balance Sheets (Unaudited at June 30, 2021)												37
Consolidated Statements of Changes in Total Equity (Unaudited)												38
Consolidated Cash Flow Statements (Unaudited)												39
Notes to Consolidated Financial Statements (Unaudited)												40
1.			Introduction and Basis of Presentation									40
2.			Significant Accounting Policies									41
3.			Acquisitions									41
4.			Cash and Cash Equivalents									42
5.			Fair Values									42
6.			Fair Value Option									48
7.			Derivative Instruments and Hedging Activities									49
8.			Investment Securities									52
9.			Collateralized Transactions									54
10.			Loans, Lending Commitments and Related Allowance for Credit Losses									56
11.			Other Assets—Equity Method Investments									58
12.			Deposits									58
13.			Borrowings and Other Secured Financings									58
14.			Commitments, Guarantees and Contingencies									59
15.			Variable Interest Entities and Securitization Activities									61
16.			Regulatory Requirements									63
17.			Total Equity									65
18.			Interest Income and Interest Expense									67
19.			Income Taxes									67
20.			Segment, Geographic and Revenue Information									68
Financial Data Supplement (Unaudited)												71
Glossary of Common Terms and Acronyms												72
Other Information						II						73
Legal Proceedings						II			1			73
Risk Factors						II			1A			73
Unregistered Sales of Equity Securities and Use of Proceeds						II			2			73
Controls and Procedures						I			4			73
Exhibits						II			6			73
Signatures												74

Available Information

We file annual, quarterly and current reports, proxy statements and other information with the SEC. The SEC maintains a website, www.sec.gov, that contains annual, quarterly and current reports, proxy and information statements and other information that issuers file electronically with the SEC. Our electronic SEC filings are available to the public at the SEC’s website.

Our website is www.morganstanley.com. You can access our Investor Relations webpage at www.morganstanley.com/about-us-ir. We make available free of charge, on or through our Investor Relations webpage, our proxy statements, annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and any amendments to those reports filed or furnished pursuant to the Securities Exchange Act of 1934, as amended (“Exchange Act”), as soon as reasonably practicable after such material is electronically filed with, or furnished to, the SEC. We also make available, through our Investor Relations webpage, via a link to the SEC’s website, statements of beneficial ownership of our equity securities filed by our directors, officers, 10% or greater shareholders and others under Section 16 of the Exchange Act.

You can access information about our corporate governance at www.morganstanley.com/about-us-governance, our sustainability initiatives at www.morganstanley.com/about-us/sustainability-at-morgan-stanley and our commitment to diversity and inclusion at www.morganstanley.com/about-us/diversity. Our webpages include:

 

•Amended and Restated Certificate of Incorporation;

•Amended and Restated Bylaws;

•Charters for our Audit Committee, Compensation, Management Development and Succession Committee, Nominating and Governance Committee, Operations and Technology Committee, and Risk Committee;

•Corporate Governance Policies;

•Policy Regarding Corporate Political Activities;

•Policy Regarding Shareholder Rights Plan;

•Equity Ownership Commitment;

•Code of Ethics and Business Conduct;

•Code of Conduct;

•Integrity Hotline Information;

•Environmental and Social Policies;

•Sustainability Report;

•Task Force on Climate-related Financial Disclosures Report; and

•Diversity and Inclusion Report.

Our Code of Ethics and Business Conduct applies to all directors, officers and employees, including our Chief Executive Officer, Chief Financial Officer and Deputy Chief Financial Officer. We will post any amendments to the Code of Ethics and Business Conduct and any waivers that are required to be disclosed by the rules of either the SEC or the New York Stock Exchange LLC (“NYSE”) on our website. You can request a copy of these documents, excluding exhibits, at no cost, by contacting Investor Relations, 1585 Broadway, New York, NY 10036 (212-761-4000). The information on our website is not incorporated by reference into this report.