false2021FYMORGAN STANLEY0000895421truefalsehttp://fasb.org/us-gaap/2021-01-31#OtherAssetshttp://fasb.org/us-gaap/2021-01-31#OtherAssetshttp://fasb.org/us-gaap/2021-01-31#AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrenthttp://fasb.org/us-gaap/2021-01-31#AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentP1YP3Y00008954212021-01-012021-12-310000895421us-gaap:CommonClassAMember2021-01-012021-12-310000895421us-gaap:SeriesAPreferredStockMember2021-01-012021-12-310000895421us-gaap:SeriesEPreferredStockMember2021-01-012021-12-310000895421us-gaap:SeriesFPreferredStockMember2021-01-012021-12-310000895421ms:SeriesIPreferredStockMember2021-01-012021-12-310000895421ms:SeriesKPreferredStockMember2021-01-012021-12-310000895421ms:SeriesLPreferredStockMember2021-01-012021-12-310000895421ms:SeriesOPreferredStockMember2021-01-012021-12-310000895421ms:GlobalMediumTermNotesSeriesAFixedRateStepUpSeniorNotesDue2026ofMorganStanleyFinanceLLCMember2021-01-012021-12-3100008954212021-06-30iso4217:USD00008954212022-01-31xbrli:shares00008954212020-01-012020-12-3100008954212019-01-012019-12-31iso4217:USDxbrli:shares00008954212021-12-3100008954212020-12-310000895421us-gaap:PreferredStockMember2020-12-310000895421us-gaap:PreferredStockMember2019-12-310000895421us-gaap:PreferredStockMember2018-12-310000895421us-gaap:PreferredStockMember2021-01-012021-12-310000895421us-gaap:PreferredStockMember2020-01-012020-12-310000895421us-gaap:PreferredStockMember2019-01-012019-12-310000895421us-gaap:PreferredStockMember2021-12-310000895421us-gaap:CommonStockMember2020-12-310000895421us-gaap:CommonStockMember2021-12-310000895421us-gaap:CommonStockMember2019-12-310000895421us-gaap:CommonStockMember2018-12-310000895421us-gaap:AdditionalPaidInCapitalMember2020-12-310000895421us-gaap:AdditionalPaidInCapitalMember2019-12-310000895421us-gaap:AdditionalPaidInCapitalMember2018-12-310000895421us-gaap:AdditionalPaidInCapitalMember2021-01-012021-12-310000895421us-gaap:AdditionalPaidInCapitalMember2020-01-012020-12-310000895421us-gaap:AdditionalPaidInCapitalMember2019-01-012019-12-310000895421ms:EatonVanceCorpMemberus-gaap:AdditionalPaidInCapitalMember2021-01-012021-12-310000895421ms:EatonVanceCorpMemberus-gaap:AdditionalPaidInCapitalMember2020-01-012020-12-310000895421ms:EatonVanceCorpMemberus-gaap:AdditionalPaidInCapitalMember2019-01-012019-12-310000895421us-gaap:AdditionalPaidInCapitalMemberms:ETRADEFinancialCorporationMember2021-01-012021-12-310000895421us-gaap:AdditionalPaidInCapitalMemberms:ETRADEFinancialCorporationMember2020-01-012020-12-310000895421us-gaap:AdditionalPaidInCapitalMemberms:ETRADEFinancialCorporationMember2019-01-012019-12-310000895421us-gaap:AdditionalPaidInCapitalMember2021-12-310000895421us-gaap:RetainedEarningsMember2020-12-310000895421us-gaap:RetainedEarningsMember2019-12-310000895421us-gaap:RetainedEarningsMember2018-12-310000895421us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310000895421us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2018-12-310000895421us-gaap:RetainedEarningsMember2021-01-012021-12-310000895421us-gaap:RetainedEarningsMember2020-01-012020-12-310000895421us-gaap:RetainedEarningsMember2019-01-012019-12-310000895421us-gaap:RetainedEarningsMember2021-12-310000895421us-gaap:TrustForBenefitOfEmployeesMember2020-12-310000895421us-gaap:TrustForBenefitOfEmployeesMember2019-12-310000895421us-gaap:TrustForBenefitOfEmployeesMember2018-12-310000895421us-gaap:TrustForBenefitOfEmployeesMember2021-01-012021-12-310000895421us-gaap:TrustForBenefitOfEmployeesMember2020-01-012020-12-310000895421us-gaap:TrustForBenefitOfEmployeesMember2019-01-012019-12-310000895421us-gaap:TrustForBenefitOfEmployeesMember2021-12-310000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-310000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-12-310000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310000895421us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-310000895421us-gaap:TreasuryStockMember2020-12-310000895421us-gaap:TreasuryStockMember2019-12-310000895421us-gaap:TreasuryStockMember2018-12-310000895421us-gaap:TreasuryStockMember2021-01-012021-12-310000895421us-gaap:TreasuryStockMember2020-01-012020-12-310000895421us-gaap:TreasuryStockMember2019-01-012019-12-310000895421ms:EatonVanceCorpMemberus-gaap:TreasuryStockMember2021-01-012021-12-310000895421ms:EatonVanceCorpMemberus-gaap:TreasuryStockMember2020-01-012020-12-310000895421ms:EatonVanceCorpMemberus-gaap:TreasuryStockMember2019-01-012019-12-310000895421us-gaap:TreasuryStockMemberms:ETRADEFinancialCorporationMember2021-01-012021-12-310000895421us-gaap:TreasuryStockMemberms:ETRADEFinancialCorporationMember2020-01-012020-12-310000895421us-gaap:TreasuryStockMemberms:ETRADEFinancialCorporationMember2019-01-012019-12-310000895421us-gaap:TreasuryStockMember2021-12-310000895421ms:CommonStockIssuedToEmployeeTrustMember2020-12-310000895421ms:CommonStockIssuedToEmployeeTrustMember2019-12-310000895421ms:CommonStockIssuedToEmployeeTrustMember2018-12-310000895421ms:CommonStockIssuedToEmployeeTrustMember2021-01-012021-12-310000895421ms:CommonStockIssuedToEmployeeTrustMember2020-01-012020-12-310000895421ms:CommonStockIssuedToEmployeeTrustMember2019-01-012019-12-310000895421ms:CommonStockIssuedToEmployeeTrustMember2021-12-310000895421us-gaap:NoncontrollingInterestMember2020-12-310000895421us-gaap:NoncontrollingInterestMember2019-12-310000895421us-gaap:NoncontrollingInterestMember2018-12-310000895421us-gaap:NoncontrollingInterestMember2021-01-012021-12-310000895421us-gaap:NoncontrollingInterestMember2020-01-012020-12-310000895421us-gaap:NoncontrollingInterestMember2019-01-012019-12-310000895421us-gaap:NoncontrollingInterestMember2021-12-3100008954212019-12-310000895421ms:EatonVanceCorpMember2021-01-012021-12-310000895421ms:EatonVanceCorpMember2020-01-012020-12-310000895421ms:EatonVanceCorpMember2019-01-012019-12-310000895421ms:ETRADEFinancialCorporationMember2021-01-012021-12-310000895421ms:ETRADEFinancialCorporationMember2020-01-012020-12-310000895421ms:ETRADEFinancialCorporationMember2019-01-012019-12-3100008954212018-12-310000895421srt:MinimumMember2021-01-012021-12-31xbrli:pure0000895421srt:MaximumMember2021-01-012021-12-310000895421us-gaap:BuildingMember2021-01-012021-12-310000895421ms:LeaseholdImprovementsBuildingMembersrt:MaximumMember2021-01-012021-12-310000895421ms:LeaseholdImprovementsOtherAssetsMembersrt:MaximumMember2021-01-012021-12-310000895421us-gaap:FurnitureAndFixturesMember2021-01-012021-12-310000895421us-gaap:EquipmentMembersrt:MinimumMember2021-01-012021-12-310000895421srt:MaximumMemberus-gaap:EquipmentMember2021-01-012021-12-310000895421us-gaap:ElectricityGenerationPlantNonNuclearMembersrt:MinimumMember2021-01-012021-12-310000895421us-gaap:ElectricityGenerationPlantNonNuclearMembersrt:MaximumMember2021-01-012021-12-310000895421srt:MinimumMemberus-gaap:ComputerSoftwareIntangibleAssetMember2021-01-012021-12-310000895421srt:MaximumMemberus-gaap:ComputerSoftwareIntangibleAssetMember2021-01-012021-12-310000895421srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberms:AllowanceforCreditLossesMemberus-gaap:AccountingStandardsUpdate201613Member2019-12-310000895421us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:AccountingStandardsUpdate201613Member2019-12-310000895421ms:AllowanceforCreditLossesonEmployeeLoansMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:AccountingStandardsUpdate201613Member2019-12-310000895421ms:EatonVanceCorpMember2021-03-010000895421ms:EatonVanceCorpMember2021-03-012021-03-010000895421ms:EatonVanceCorpMemberus-gaap:CommonClassAMember2021-03-012021-03-010000895421ms:EatonVanceCorpMemberms:ManagementContractsMember2021-03-010000895421ms:EatonVanceCorpMemberus-gaap:CustomerRelationshipsMember2021-03-012021-03-010000895421ms:EatonVanceCorpMemberus-gaap:CustomerRelationshipsMember2021-03-010000895421ms:EatonVanceCorpMemberus-gaap:TradeNamesMember2021-03-012021-03-010000895421ms:EatonVanceCorpMemberus-gaap:TradeNamesMember2021-03-010000895421ms:EatonVanceCorpMemberms:ManagementContractsMember2021-03-012021-03-010000895421ms:EatonVanceCorpMemberms:ManagementContractsMember2021-03-010000895421ms:EatonVanceCorpMember2021-03-012021-12-310000895421ms:ETRADEFinancialCorporationMember2020-10-020000895421ms:ETRADEFinancialCorporationMember2020-10-022020-10-020000895421us-gaap:CommonClassAMemberms:ETRADEFinancialCorporationMember2020-10-022020-10-020000895421ms:SeriesMPreferredStockandSeriesNPreferredStockMemberms:ETRADEFinancialCorporationMember2020-10-022020-10-020000895421us-gaap:CustomerRelationshipsMemberms:ETRADEFinancialCorporationMember2020-10-020000895421us-gaap:CustomerRelationshipsMemberms:ETRADEFinancialCorporationMember2020-10-022020-10-020000895421ms:ETRADEFinancialCorporationMember2020-10-022020-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-12-310000895421ms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel12And3Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel12And3Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2021-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2021-12-310000895421ms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel12And3Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421ms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel12And3Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel12And3Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000895421us-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000895421ms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel12And3Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel12And3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:CommercialPortfolioSegmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-12-310000895421us-gaap:CommercialPortfolioSegmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421ms:SecuredLendingFacilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-12-310000895421ms:SecuredLendingFacilitiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-12-310000895421us-gaap:CommercialRealEstatePortfolioSegmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-12-310000895421us-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FutureMemberus-gaap:FairValueMeasurementsRecurringMemberms:AccountsReceivableAndOtherReceivablesNetMember2021-12-310000895421us-gaap:FutureMemberus-gaap:FairValueMeasurementsRecurringMemberms:AccountsReceivableAndOtherReceivablesNetMember2020-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CorporateEquitiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InvestmentsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:DepositsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:DepositsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:DepositsMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:DepositsMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:DepositsMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:DepositsMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:DepositsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:NonderivativeTradingLiabilitiesMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:OtherSecuredFinancingsMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:OtherSecuredFinancingsMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:OtherSecuredFinancingsMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:OtherSecuredFinancingsMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:OtherSecuredFinancingsMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:OtherSecuredFinancingsMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberms:OtherSecuredFinancingsMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMember2018-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-01-012020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-01-012019-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2021-07-012021-09-300000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-01-012020-03-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMember2020-04-012020-06-300000895421us-gaap:FairValueInputsLevel3Memberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-04-012021-06-300000895421us-gaap:FairValueInputsLevel3Memberus-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-04-012021-06-300000895421us-gaap:FairValueInputsLevel3Memberus-gaap:BorrowingsMemberus-gaap:FairValueMeasurementsRecurringMember2021-04-012021-06-300000895421us-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-01-012021-03-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberus-gaap:ForeignGovernmentDebtSecuritiesMembersrt:MaximumMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberus-gaap:ForeignGovernmentDebtSecuritiesMembersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMembersrt:MaximumMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMembersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMembersrt:MaximumMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MortgageAndAssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMembersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueMarginLoanMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberms:MeasurementInputMarginLoanMemberus-gaap:SeniorDebtObligationsMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueMarginLoanMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputMarginLoanMemberus-gaap:SeniorDebtObligationsMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueMarginLoanMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputMarginLoanMemberus-gaap:SeniorDebtObligationsMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueMarginLoanMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberms:MeasurementInputMarginLoanMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueMarginLoanMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputMarginLoanMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueMarginLoanMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputMarginLoanMemberus-gaap:SeniorDebtObligationsMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:SeniorDebtObligationsMemberms:MeasurementInputLoanPriceMember2021-12-310000895421us-gaap:FairValueInputsLevel3Membersrt:MaximumMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberms:MeasurementInputLoanPriceMember2021-12-310000895421us-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberms:MeasurementInputLoanPriceMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:SeniorDebtObligationsMemberms:MeasurementInputLoanPriceMember2020-12-310000895421us-gaap:FairValueInputsLevel3Membersrt:MaximumMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberms:MeasurementInputLoanPriceMember2020-12-310000895421us-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:SeniorDebtObligationsMemberms:MeasurementInputLoanPriceMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:CorporateandOtherDebtSecuritiesMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMembersrt:MaximumMemberms:CorporateandOtherDebtSecuritiesMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:CorporateandOtherDebtSecuritiesMembersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:CorporateandOtherDebtSecuritiesMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMembersrt:MaximumMemberms:CorporateandOtherDebtSecuritiesMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:CorporateandOtherDebtSecuritiesMembersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MeasurementInputLossGivenDefaultMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421ms:MeasurementInputLossGivenDefaultMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MaximumMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputLossGivenDefaultMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2021-12-310000895421ms:MeasurementInputLossGivenDefaultMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:CorporateandOtherDebtSecuritiesMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputLossGivenDefaultMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421ms:MeasurementInputLossGivenDefaultMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MaximumMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MeasurementInputLossGivenDefaultMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:CorporateandOtherDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2020-12-310000895421ms:MeasurementInputLossGivenDefaultMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:CorporateandOtherDebtSecuritiesMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:CorporateandOtherDebtSecuritiesMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:CorporateandOtherDebtSecuritiesMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:CorporateandOtherDebtSecuritiesMembersrt:WeightedAverageMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MeasurementInputSharePriceMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MeasurementInputSharePriceMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MaximumMemberms:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputWeightedAverageCostOfCapitalMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MaximumMemberms:MeasurementInputWeightedAverageCostOfCapitalMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputWeightedAverageCostOfCapitalMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MeasurementInputExitMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421ms:MeasurementInputExitMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputExitMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputExitMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421ms:MeasurementInputExitMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MeasurementInputExitMultipleMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMembersrt:MaximumMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:MeasurementInputEbitdaMultipleMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMembersrt:MaximumMemberus-gaap:MeasurementInputEbitdaMultipleMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:MeasurementInputEbitdaMultipleMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:MeasurementInputSharePriceMember2021-12-310000895421us-gaap:FairValueInputsLevel3Membersrt:MaximumMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MeasurementInputSharePriceMember2021-12-310000895421us-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MeasurementInputSharePriceMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:MeasurementInputSharePriceMember2020-12-310000895421us-gaap:FairValueInputsLevel3Membersrt:MaximumMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MeasurementInputSharePriceMember2020-12-310000895421us-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MeasurementInputSharePriceMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMembersrt:MaximumMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMembersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMembersrt:MaximumMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMembersrt:MedianMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMembersrt:MaximumMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMembersrt:MedianMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveCorrelationMemberus-gaap:InterestRateContractMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MeasurementInputBondVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421ms:MeasurementInputBondVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputBondVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2021-12-310000895421ms:MeasurementInputBondVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputBondVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421ms:MeasurementInputBondVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MeasurementInputBondVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2020-12-310000895421ms:MeasurementInputBondVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MeasurementInputInflationVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421ms:MeasurementInputInflationVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputInflationVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2021-12-310000895421ms:MeasurementInputInflationVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputInflationVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421ms:MeasurementInputInflationVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MeasurementInputInflationVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2020-12-310000895421ms:MeasurementInputInflationVolatilityMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:InterestRateContractMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveMemberus-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2020-12-310000895421ms:MeasurementInputCashSyntheticBasisMemberus-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2021-12-310000895421ms:MeasurementInputCashSyntheticBasisMemberus-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberms:MeasurementInputBondPriceMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberms:MeasurementInputBondPriceMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberms:MeasurementInputBondPriceMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberms:MeasurementInputBondPriceMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberms:MeasurementInputBondPriceMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberms:MeasurementInputBondPriceMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMembersrt:MaximumMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberus-gaap:MeasurementInputCreditSpreadMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMembersrt:MaximumMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberus-gaap:MeasurementInputCreditSpreadMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberms:MeasurementInputFundingSpreadMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberms:MeasurementInputFundingSpreadMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberms:MeasurementInputFundingSpreadMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberms:MeasurementInputFundingSpreadMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberms:MeasurementInputFundingSpreadMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CreditDefaultSwapModelMemberms:MeasurementInputFundingSpreadMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2020-12-310000895421ms:ValuationTechniqueCorrelationModelMemberus-gaap:FairValueInputsLevel3Memberms:MeasurementInputCreditCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:CreditRiskContractMember2020-12-310000895421ms:ValuationTechniqueCorrelationModelMemberus-gaap:FairValueInputsLevel3Membersrt:MaximumMemberms:MeasurementInputCreditCorrelationMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2020-12-310000895421ms:ValuationTechniqueCorrelationModelMemberus-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberms:MeasurementInputCreditCorrelationMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MedianMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MedianMemberms:MeasurementInputInterestRateVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCurveMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputForeignExchangeVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputForeignExchangeVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputForeignExchangeVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MedianMemberms:MeasurementInputForeignExchangeVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputForeignExchangeVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputForeignExchangeVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputForeignExchangeVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MedianMemberms:MeasurementInputForeignExchangeVolatilitySkewMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputContingencyProbabilityMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputContingencyProbabilityMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputContingencyProbabilityMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputContingencyProbabilityMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputContingencyProbabilityMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputContingencyProbabilityMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputContingencyProbabilityMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputContingencyProbabilityMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:WeightedAverageMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:WeightedAverageMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2020-12-310000895421ms:MeasurementInputEquityVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:EquityContractMember2021-12-310000895421ms:MeasurementInputEquityVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2021-12-310000895421ms:MeasurementInputEquityVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2021-12-310000895421ms:MeasurementInputEquityVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:EquityContractMember2020-12-310000895421ms:MeasurementInputEquityVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2020-12-310000895421ms:MeasurementInputEquityVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityCorrelationMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityCorrelationMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityCorrelationMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityCorrelationMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberms:MeasurementInputForeignExchangeCorrelationMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputForeignExchangeCorrelationMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputForeignExchangeCorrelationMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberms:MeasurementInputForeignExchangeCorrelationMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputForeignExchangeCorrelationMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputForeignExchangeCorrelationMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputInterestRateCorrelationMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCorrelationMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMembersrt:ArithmeticAverageMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputInterestRateCorrelationMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateCorrelationMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMembersrt:ArithmeticAverageMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MedianMemberms:MeasurementInputInterestRateCorrelationMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputForwardPowerPriceMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-31iso4217:USDms:MWh0000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputForwardPowerPriceMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputForwardPowerPriceMembersrt:WeightedAverageMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputForwardPowerPriceMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputForwardPowerPriceMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputForwardPowerPriceMembersrt:WeightedAverageMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputCommodityVolatilityMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputCommodityVolatilityMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputCommodityVolatilityMembersrt:WeightedAverageMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputCommodityVolatilityMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputCommodityVolatilityMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputCommodityVolatilityMembersrt:WeightedAverageMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MeasurementInputCrossCommodityCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421ms:MeasurementInputCrossCommodityCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputCrossCommodityCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:WeightedAverageMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputCrossCommodityCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421ms:MeasurementInputCrossCommodityCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MeasurementInputCrossCommodityCorrelationMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:WeightedAverageMemberms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:WeightedAverageMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MeasurementInputSharePriceMember2021-12-310000895421ms:CorporateEquitiesMemberus-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MeasurementInputSharePriceMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputFundingSpreadMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputFundingSpreadMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputFundingSpreadMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputFundingSpreadMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputFundingSpreadMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMemberms:MeasurementInputFundingSpreadMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberms:MeasurementInputLoanPriceMember2021-12-310000895421us-gaap:FairValueInputsLevel3Membersrt:MaximumMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputLoanPriceMember2021-12-310000895421us-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputLoanPriceMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMemberms:MeasurementInputLoanPriceMember2020-12-310000895421us-gaap:FairValueInputsLevel3Membersrt:MaximumMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputLoanPriceMember2020-12-310000895421us-gaap:FairValueInputsLevel3Membersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsRecurringMemberms:MeasurementInputLoanPriceMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:WeightedAverageMemberms:MeasurementInputEquityVolatilityMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputEquityVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421ms:MeasurementInputEquityVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputEquityVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:MeasurementInputEquityVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421ms:MeasurementInputEquityVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:MeasurementInputEquityVolatilitySkewMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityCorrelationMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityCorrelationMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityCorrelationMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityCorrelationMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityForeignExchangeCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputEquityForeignExchangeCorrelationMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityForeignExchangeCorrelationMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityForeignExchangeCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMembersrt:MaximumMemberms:MeasurementInputEquityForeignExchangeCorrelationMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputEquityForeignExchangeCorrelationMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMembersrt:MaximumMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMemberus-gaap:FairValueMeasurementsRecurringMembersrt:ArithmeticAverageMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueOptionPricingModelMemberms:MeasurementInputInterestRateForeignExchangeCorrelationMembersrt:MedianMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueCorporateLoanModelMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsNonrecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueCorporateLoanModelMembersrt:MaximumMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueCorporateLoanModelMemberus-gaap:MeasurementInputCreditSpreadMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueCorporateLoanModelMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsNonrecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueCorporateLoanModelMembersrt:MaximumMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueCorporateLoanModelMemberus-gaap:MeasurementInputCreditSpreadMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueWarehouseModelMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsNonrecurringMembersrt:MinimumMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueWarehouseModelMembersrt:MaximumMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueWarehouseModelMemberus-gaap:MeasurementInputCreditSpreadMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueWarehouseModelMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsNonrecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueWarehouseModelMembersrt:MaximumMemberus-gaap:MeasurementInputCreditSpreadMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:ValuationTechniqueWarehouseModelMemberus-gaap:MeasurementInputCreditSpreadMembersrt:WeightedAverageMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsNonrecurringMembersrt:MinimumMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMembersrt:MaximumMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:MeasurementInputBondPriceMembersrt:WeightedAverageMemberms:ValuationTechniqueComparablePricingMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-12-310000895421us-gaap:PrivateEquityFundsMember2021-12-310000895421us-gaap:PrivateEquityFundsMember2020-12-310000895421us-gaap:RealEstateFundsMember2021-12-310000895421us-gaap:RealEstateFundsMember2020-12-310000895421us-gaap:HedgeFundsMember2021-12-310000895421us-gaap:HedgeFundsMember2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsNonrecurringMember2021-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMember2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsNonrecurringMember2020-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMember2020-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:LendingCommitmentMember2021-01-012021-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:LendingCommitmentMember2020-01-012020-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:LendingCommitmentMember2019-01-012019-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:GoodwillMember2021-01-012021-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:GoodwillMember2020-01-012020-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:GoodwillMember2019-01-012019-12-310000895421ms:IntangibleAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-01-012021-12-310000895421ms:IntangibleAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-01-012020-12-310000895421ms:IntangibleAssetsMemberus-gaap:FairValueMeasurementsNonrecurringMember2019-01-012019-12-310000895421us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-01-012021-12-310000895421us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-01-012020-12-310000895421us-gaap:OtherInvestmentsMemberus-gaap:FairValueMeasurementsNonrecurringMember2019-01-012019-12-310000895421ms:PropertyPlantAndEquipmentAndCapitalizedSoftwareCostsMemberus-gaap:FairValueMeasurementsNonrecurringMember2021-01-012021-12-310000895421ms:PropertyPlantAndEquipmentAndCapitalizedSoftwareCostsMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-01-012020-12-310000895421ms:PropertyPlantAndEquipmentAndCapitalizedSoftwareCostsMemberus-gaap:FairValueMeasurementsNonrecurringMember2019-01-012019-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:RightOfUseAssetsMember2021-01-012021-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:RightOfUseAssetsMember2020-01-012020-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberms:RightOfUseAssetsMember2019-01-012019-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:AssetsMember2021-01-012021-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:AssetsMember2020-01-012020-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:AssetsMember2019-01-012019-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:OtherLiabilitiesMember2021-01-012021-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:OtherLiabilitiesMember2020-01-012020-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:OtherLiabilitiesMember2019-01-012019-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LiabilityMember2021-01-012021-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LiabilityMember2020-01-012020-12-310000895421us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:LiabilityMember2019-01-012019-12-310000895421us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMember2021-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2021-12-310000895421us-gaap:EstimateOfFairValueFairValueDisclosureMember2021-12-310000895421us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMember2020-12-310000895421us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000895421us-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000895421us-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:EquityContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:InterestRateContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421ms:CommodityAndOtherContractsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000895421us-gaap:ForeignExchangeContractMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000895421us-gaap:TradingRevenueMemberus-gaap:DebtMember2021-01-012021-12-310000895421us-gaap:TradingRevenueMemberus-gaap:DebtMember2020-01-012020-12-310000895421us-gaap:TradingRevenueMemberus-gaap:DebtMember2019-01-012019-12-310000895421us-gaap:DebtMemberus-gaap:InterestExpenseMember2021-01-012021-12-310000895421us-gaap:DebtMemberus-gaap:InterestExpenseMember2020-01-012020-12-310000895421us-gaap:DebtMemberus-gaap:InterestExpenseMember2019-01-012019-12-310000895421us-gaap:DebtMember2021-01-012021-12-310000895421us-gaap:DebtMember2020-01-012020-12-310000895421us-gaap:DebtMember2019-01-012019-12-310000895421us-gaap:TradingRevenueMemberms:LoansAndOtherReceivablesMember2021-01-012021-12-310000895421us-gaap:OtherComprehensiveIncomeMemberms:LoansAndOtherReceivablesMember2021-01-012021-12-310000895421us-gaap:WrittenLoanCommitmentFairValueOptionMemberus-gaap:TradingRevenueMember2021-01-012021-12-310000895421us-gaap:WrittenLoanCommitmentFairValueOptionMemberus-gaap:OtherComprehensiveIncomeMember2021-01-012021-12-310000895421us-gaap:TradingRevenueMemberus-gaap:DepositsMember2021-01-012021-12-310000895421us-gaap:OtherComprehensiveIncomeMemberus-gaap:DepositsMember2021-01-012021-12-310000895421us-gaap:OtherComprehensiveIncomeMemberus-gaap:DebtMember2021-01-012021-12-310000895421us-gaap:TradingRevenueMemberms:LoansAndOtherReceivablesMember2020-01-012020-12-310000895421us-gaap:OtherComprehensiveIncomeMemberms:LoansAndOtherReceivablesMember2020-01-012020-12-310000895421us-gaap:WrittenLoanCommitmentFairValueOptionMemberus-gaap:TradingRevenueMember2020-01-012020-12-310000895421us-gaap:WrittenLoanCommitmentFairValueOptionMemberus-gaap:OtherComprehensiveIncomeMember2020-01-012020-12-310000895421us-gaap:TradingRevenueMemberus-gaap:DepositsMember2020-01-012020-12-310000895421us-gaap:OtherComprehensiveIncomeMemberus-gaap:DepositsMember2020-01-012020-12-310000895421us-gaap:OtherComprehensiveIncomeMemberus-gaap:DebtMember2020-01-012020-12-310000895421us-gaap:TradingRevenueMemberms:LoansAndOtherReceivablesMember2019-01-012019-12-310000895421us-gaap:OtherComprehensiveIncomeMemberms:LoansAndOtherReceivablesMember2019-01-012019-12-310000895421us-gaap:WrittenLoanCommitmentFairValueOptionMemberus-gaap:TradingRevenueMember2019-01-012019-12-310000895421us-gaap:WrittenLoanCommitmentFairValueOptionMemberus-gaap:OtherComprehensiveIncomeMember2019-01-012019-12-310000895421us-gaap:TradingRevenueMemberus-gaap:DepositsMember2019-01-012019-12-310000895421us-gaap:OtherComprehensiveIncomeMemberus-gaap:DepositsMember2019-01-012019-12-310000895421us-gaap:OtherComprehensiveIncomeMemberus-gaap:DebtMember2019-01-012019-12-310000895421us-gaap:TradingRevenueMemberus-gaap:OtherDebtSecuritiesMember2019-01-012019-12-310000895421us-gaap:OtherComprehensiveIncomeMemberus-gaap:OtherDebtSecuritiesMember2019-01-012019-12-310000895421us-gaap:OverTheCounterMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMember2021-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMemberus-gaap:ExchangeClearedMember2021-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMember2021-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMember2021-12-310000895421us-gaap:OverTheCounterMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMember2021-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMemberus-gaap:ExchangeClearedMember2021-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMember2021-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMember2021-12-310000895421us-gaap:OverTheCounterMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ExchangeClearedMember2021-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMember2021-12-310000895421us-gaap:OverTheCounterMemberus-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2021-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberus-gaap:ExchangeClearedMember2021-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2021-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:OverTheCounterMemberus-gaap:InterestRateContractMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:InterestRateContractMemberus-gaap:ExchangeClearedMember2021-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:InterestRateContractMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:InterestRateContractMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:OverTheCounterMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:CreditRiskContractMemberus-gaap:ExchangeClearedMember2021-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:CreditRiskContractMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:OverTheCounterMemberus-gaap:ForeignExchangeContractMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ForeignExchangeContractMemberus-gaap:ExchangeClearedMember2021-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ForeignExchangeContractMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ForeignExchangeContractMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:OverTheCounterMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:EquityContractMemberus-gaap:ExchangeClearedMember2021-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:OverTheCounterMemberms:CommodityAndOtherContractsMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberms:CommodityAndOtherContractsMemberus-gaap:ExchangeClearedMember2021-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberms:CommodityAndOtherContractsMember2021-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberms:CommodityAndOtherContractsMember2021-12-310000895421us-gaap:OverTheCounterMemberus-gaap:NondesignatedMember2021-12-310000895421us-gaap:NondesignatedMemberus-gaap:ExchangeClearedMember2021-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:NondesignatedMember2021-12-310000895421us-gaap:NondesignatedMember2021-12-310000895421us-gaap:OverTheCounterMember2021-12-310000895421us-gaap:ExchangeClearedMember2021-12-310000895421us-gaap:ExchangeTradedMember2021-12-310000895421us-gaap:OverTheCounterMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMember2020-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMember2020-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMember2020-12-310000895421us-gaap:OverTheCounterMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMember2020-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMember2020-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMember2020-12-310000895421us-gaap:OverTheCounterMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000895421us-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000895421us-gaap:OverTheCounterMemberus-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:OverTheCounterMemberus-gaap:InterestRateContractMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:InterestRateContractMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:InterestRateContractMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:InterestRateContractMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:OverTheCounterMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:CreditRiskContractMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:CreditRiskContractMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:OverTheCounterMemberus-gaap:ForeignExchangeContractMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ForeignExchangeContractMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ForeignExchangeContractMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:ForeignExchangeContractMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:OverTheCounterMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:EquityContractMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:EquityContractMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberus-gaap:OverTheCounterMemberms:CommodityAndOtherContractsMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberms:CommodityAndOtherContractsMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:NotDesignatedAsHedgingInstrumentTradingMemberms:CommodityAndOtherContractsMember2020-12-310000895421us-gaap:NotDesignatedAsHedgingInstrumentTradingMemberms:CommodityAndOtherContractsMember2020-12-310000895421us-gaap:OverTheCounterMemberus-gaap:NondesignatedMember2020-12-310000895421us-gaap:NondesignatedMemberus-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMemberus-gaap:NondesignatedMember2020-12-310000895421us-gaap:NondesignatedMember2020-12-310000895421us-gaap:OverTheCounterMember2020-12-310000895421us-gaap:ExchangeClearedMember2020-12-310000895421us-gaap:ExchangeTradedMember2020-12-310000895421us-gaap:InterestIncomeMemberus-gaap:InterestRateContractMemberus-gaap:FairValueHedgingMember2021-01-012021-12-310000895421us-gaap:InterestIncomeMemberus-gaap:InterestRateContractMemberus-gaap:FairValueHedgingMember2020-01-012020-12-310000895421us-gaap:InterestIncomeMemberus-gaap:InterestRateContractMemberus-gaap:FairValueHedgingMember2019-01-012019-12-310000895421us-gaap:InterestIncomeMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueHedgingMember2021-01-012021-12-310000895421us-gaap:InterestIncomeMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueHedgingMember2020-01-012020-12-310000895421us-gaap:InterestIncomeMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:FairValueHedgingMember2019-01-012019-12-310000895421us-gaap:InterestRateContractMemberus-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMember2021-01-012021-12-310000895421us-gaap:InterestRateContractMemberus-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMember2020-01-012020-12-310000895421us-gaap:InterestRateContractMemberus-gaap:InterestExpenseMemberus-gaap:FairValueHedgingMember2019-01-012019-12-310000895421us-gaap:InterestExpenseMemberus-gaap:DepositsMemberus-gaap:FairValueHedgingMember2021-01-012021-12-310000895421us-gaap:InterestExpenseMemberus-gaap:DepositsMemberus-gaap:FairValueHedgingMember2020-01-012020-12-310000895421us-gaap:InterestExpenseMemberus-gaap:DepositsMemberus-gaap:FairValueHedgingMember2019-01-012019-12-310000895421us-gaap:InterestExpenseMemberus-gaap:BorrowingsMemberus-gaap:FairValueHedgingMember2021-01-012021-12-310000895421us-gaap:InterestExpenseMemberus-gaap:BorrowingsMemberus-gaap:FairValueHedgingMember2020-01-012020-12-310000895421us-gaap:InterestExpenseMemberus-gaap:BorrowingsMemberus-gaap:FairValueHedgingMember2019-01-012019-12-310000895421us-gaap:NetInvestmentHedgingMemberus-gaap:ForeignExchangeContractMember2021-01-012021-12-310000895421us-gaap:NetInvestmentHedgingMemberus-gaap:ForeignExchangeContractMember2020-01-012020-12-310000895421us-gaap:NetInvestmentHedgingMemberus-gaap:ForeignExchangeContractMember2019-01-012019-12-310000895421us-gaap:AvailableforsaleSecuritiesMember2021-12-310000895421us-gaap:AvailableforsaleSecuritiesMember2020-12-310000895421us-gaap:DepositsMember2021-12-310000895421us-gaap:DepositsMember2020-12-310000895421us-gaap:BorrowingsMember2021-12-310000895421us-gaap:BorrowingsMember2020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2021-01-012021-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2020-01-012020-12-310000895421us-gaap:CreditRiskContractMemberus-gaap:NotDesignatedAsHedgingInstrumentEconomicHedgeMember2019-01-012019-12-310000895421ms:DerivativeCreditRiskRelatedContingentFeaturesTriggeringCircumstancesOneNotchCreditRatingDowngradeMember2021-12-310000895421ms:DerivativeCreditRiskRelatedContingentFeaturestriggeringCircumstancesTwoNotchCreditRatingDowngradeMember2021-12-310000895421us-gaap:CollaborativeArrangementMember2021-12-310000895421ms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:SingleNameCreditDefaultSwapMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:SingleNameCreditDefaultSwapMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:SingleNameCreditDefaultSwapMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:SingleNameCreditDefaultSwapMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:SingleNameCreditDefaultSwapMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:SingleNameCreditDefaultSwapMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:SingleNameCreditDefaultSwapMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:SingleNameCreditDefaultSwapMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:SingleNameCreditDefaultSwapMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:SingleNameCreditDefaultSwapMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421us-gaap:InternalInvestmentGradeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421us-gaap:InternalInvestmentGradeMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421us-gaap:InternalInvestmentGradeMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421us-gaap:InternalInvestmentGradeMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421us-gaap:InternalInvestmentGradeMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421ms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2021-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:CreditDefaultSwapMember2021-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:CreditDefaultSwapMember2021-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:CreditDefaultSwapMember2021-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:CreditDefaultSwapMember2021-12-310000895421ms:CreditDerivativesSellingProtectionMemberus-gaap:CreditDefaultSwapMember2021-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2021-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2021-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2021-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2021-12-310000895421ms:CreditDerivativesSellingProtectionMemberus-gaap:OtherCreditDerivativesMember2021-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:CreditDerivativesSellingProtectionMember2021-12-310000895421ms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:SingleNameCreditDefaultSwapMemberus-gaap:InternalInvestmentGradeMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:SingleNameCreditDefaultSwapMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:SingleNameCreditDefaultSwapMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:SingleNameCreditDefaultSwapMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:SingleNameCreditDefaultSwapMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:SingleNameCreditDefaultSwapMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:SingleNameCreditDefaultSwapMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:SingleNameCreditDefaultSwapMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:SingleNameCreditDefaultSwapMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:SingleNameCreditDefaultSwapMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:SingleNameCreditDefaultSwapMemberms:CreditDerivativesSellingProtectionMember2020-12-310000895421us-gaap:InternalInvestmentGradeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421us-gaap:InternalInvestmentGradeMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421us-gaap:InternalInvestmentGradeMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421us-gaap:InternalInvestmentGradeMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421us-gaap:InternalInvestmentGradeMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421us-gaap:InternalNoninvestmentGradeMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421ms:CreditDerivativesSellingProtectionMemberms:TotalIndexAndBasketCreditDefaultSwapsMember2020-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:CreditDefaultSwapMember2020-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:CreditDefaultSwapMember2020-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:CreditDefaultSwapMember2020-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:CreditDerivativesSellingProtectionMemberus-gaap:CreditDefaultSwapMember2020-12-310000895421ms:CreditDerivativesSellingProtectionMemberus-gaap:CreditDefaultSwapMember2020-12-310000895421ms: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:CreditDerivativesSellingProtectionMember2020-12-310000895421ms:SingleNameCreditDefaultSwapMemberus-gaap:CreditDefaultSwapBuyingProtectionMember2021-12-310000895421ms:SingleNameCreditDefaultSwapMemberus-gaap:CreditDefaultSwapBuyingProtectionMember2020-12-310000895421us-gaap:CreditDefaultSwapBuyingProtectionMemberms:IndexAndBasketCreditDefaultSwapMember2021-12-310000895421us-gaap:CreditDefaultSwapBuyingProtectionMemberms:IndexAndBasketCreditDefaultSwapMember2020-12-310000895421us-gaap:CreditDefaultSwapBuyingProtectionMemberms:TranchedIndexAndBasketCreditDefaultSwapMember2021-12-310000895421us-gaap:CreditDefaultSwapBuyingProtectionMemberms:TranchedIndexAndBasketCreditDefaultSwapMember2020-12-310000895421us-gaap:CreditDefaultSwapBuyingProtectionMemberus-gaap:CreditDefaultSwapMember2021-12-310000895421us-gaap:CreditDefaultSwapBuyingProtectionMemberus-gaap:CreditDefaultSwapMember2020-12-310000895421us-gaap:USTreasurySecuritiesMember2021-12-310000895421us-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-12-310000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2021-12-310000895421us-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000895421ms:AssetBackedSecuritiesFederalFamilyEducationLoanProgramMember2021-12-310000895421us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2021-12-310000895421us-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:USTreasurySecuritiesMember2021-01-012021-12-310000895421us-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-01-012021-12-310000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2021-01-012021-12-310000895421us-gaap:USStatesAndPoliticalSubdivisionsMember2021-01-012021-12-310000895421ms:AssetBackedSecuritiesFederalFamilyEducationLoanProgramMember2021-01-012021-12-310000895421us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember2021-01-012021-12-310000895421us-gaap:MaturityOvernightMember2021-12-310000895421us-gaap:MaturityUpTo30DaysMember2021-12-310000895421us-gaap:Maturity30To90DaysMember2021-12-310000895421us-gaap:MaturityOver90DaysMember2021-12-310000895421us-gaap:MaturityOvernightMember2020-12-310000895421us-gaap:MaturityUpTo30DaysMember2020-12-310000895421us-gaap:Maturity30To90DaysMember2020-12-310000895421us-gaap:MaturityOver90DaysMember2020-12-310000895421us-gaap:USTreasuryAndGovernmentMember2021-12-310000895421us-gaap:USTreasuryAndGovernmentMember2020-12-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMember2021-12-310000895421us-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000895421ms:CorporateEquitiesMember2021-12-310000895421ms:CorporateEquitiesMember2020-12-310000895421us-gaap:CollateralizedSecuritiesOtherMember2021-12-310000895421us-gaap:CollateralizedSecuritiesOtherMember2020-12-310000895421ms:TradingAssetsToTotalAssetsRatioMemberms:UsTreasuryAndGovernmentAndForeignGovernmentDebtSecuritiesMemberus-gaap:ProductConcentrationRiskMember2021-01-012021-12-310000895421ms:TradingAssetsToTotalAssetsRatioMemberms:UsTreasuryAndGovernmentAndForeignGovernmentDebtSecuritiesMemberus-gaap:ProductConcentrationRiskMember2020-01-012020-12-310000895421ms:UsTreasuryAndGovernmentAndForeignGovernmentDebtSecuritiesMemberms:CollateralReceivedToTotalAssetsRatioMemberus-gaap:ProductConcentrationRiskMember2021-01-012021-12-310000895421ms:UsTreasuryAndGovernmentAndForeignGovernmentDebtSecuritiesMemberms:CollateralReceivedToTotalAssetsRatioMemberus-gaap:ProductConcentrationRiskMember2020-01-012020-12-310000895421us-gaap:CommercialPortfolioSegmentMember2021-12-310000895421ms:SecuredLendingFacilitiesMember2021-12-310000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2021-12-310000895421us-gaap:ResidentialPortfolioSegmentMember2021-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMember2021-12-310000895421us-gaap:CommercialPortfolioSegmentMember2020-12-310000895421ms:SecuredLendingFacilitiesMember2020-12-310000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2020-12-310000895421us-gaap:ResidentialPortfolioSegmentMember2020-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMember2020-12-310000895421ms:InvestmentGradeMemberus-gaap:CommercialPortfolioSegmentMember2021-12-310000895421ms:NoninvestmentGradeMemberus-gaap:CommercialPortfolioSegmentMember2021-12-310000895421ms:InvestmentGradeMemberus-gaap:CommercialPortfolioSegmentMember2020-12-310000895421ms:NoninvestmentGradeMemberus-gaap:CommercialPortfolioSegmentMember2020-12-310000895421ms:InvestmentGradeMemberms:SecuredLendingFacilitiesMember2021-12-310000895421ms:NoninvestmentGradeMemberms:SecuredLendingFacilitiesMember2021-12-310000895421ms:InvestmentGradeMemberms:SecuredLendingFacilitiesMember2020-12-310000895421ms:NoninvestmentGradeMemberms:SecuredLendingFacilitiesMember2020-12-310000895421ms:InvestmentGradeMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2021-12-310000895421ms:NoninvestmentGradeMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2021-12-310000895421ms:InvestmentGradeMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2020-12-310000895421ms:NoninvestmentGradeMemberus-gaap:CommercialRealEstatePortfolioSegmentMember2020-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberms:FICOScoreGreaterthanorEqualto740Member2021-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberms:FICOScoreBetween680and739Member2021-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberms:FICOScoreLessthan680Member2021-12-310000895421ms:DebttoValueRatioLessthanorEqualto80PercentMemberus-gaap:ResidentialPortfolioSegmentMember2021-12-310000895421ms:DebttoValueRatioGreaterthan80PercentMemberus-gaap:ResidentialPortfolioSegmentMember2021-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberms:FICOScoreGreaterthanorEqualto740Member2020-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberms:FICOScoreBetween680and739Member2020-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberms:FICOScoreLessthan680Member2020-12-310000895421ms:DebttoValueRatioLessthanorEqualto80PercentMemberus-gaap:ResidentialPortfolioSegmentMember2020-12-310000895421ms:DebttoValueRatioGreaterthan80PercentMemberus-gaap:ResidentialPortfolioSegmentMember2020-12-310000895421ms:SecuritiesBasedLendingMember2021-12-310000895421ms:InvestmentGradeMemberms:OtherLoansMember2021-12-310000895421ms:NoninvestmentGradeMemberms:OtherLoansMember2021-12-310000895421ms:SecuritiesBasedLendingMember2020-12-310000895421ms:InvestmentGradeMemberms:OtherLoansMember2020-12-310000895421ms:NoninvestmentGradeMemberms:OtherLoansMember2020-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberms:FinancialAssetPastDueMinusCurrentMember2021-12-310000895421us-gaap:ResidentialPortfolioSegmentMemberms:FinancialAssetPastDueMinusCurrentMember2020-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMemberms:FinancialAssetPastDueMinusCurrentMember2021-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMemberms:FinancialAssetPastDueMinusCurrentMember2020-12-310000895421ms:FinancialAssetPastDueMinusCurrentMember2021-12-310000895421ms:FinancialAssetPastDueMinusCurrentMember2020-12-310000895421us-gaap:CommercialPortfolioSegmentMember2021-01-012021-12-310000895421ms:SecuredLendingFacilitiesMember2021-01-012021-12-310000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2021-01-012021-12-310000895421us-gaap:ResidentialPortfolioSegmentMember2021-01-012021-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMember2021-01-012021-12-310000895421us-gaap:CommercialPortfolioSegmentMember2019-12-310000895421ms:SecuredLendingFacilitiesMember2019-12-310000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2019-12-310000895421us-gaap:ResidentialPortfolioSegmentMember2019-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMember2019-12-310000895421us-gaap:CommercialPortfolioSegmentMember2020-01-012020-12-310000895421ms:SecuredLendingFacilitiesMember2020-01-012020-12-310000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2020-01-012020-12-310000895421us-gaap:ResidentialPortfolioSegmentMember2020-01-012020-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMember2020-01-012020-12-310000895421us-gaap:CommercialPortfolioSegmentMember2018-12-310000895421ms:SecuredLendingFacilitiesMember2018-12-310000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2018-12-310000895421us-gaap:ResidentialPortfolioSegmentMember2018-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMember2018-12-310000895421us-gaap:CommercialPortfolioSegmentMember2019-01-012019-12-310000895421ms:SecuredLendingFacilitiesMember2019-01-012019-12-310000895421us-gaap:CommercialRealEstatePortfolioSegmentMember2019-01-012019-12-310000895421us-gaap:ResidentialPortfolioSegmentMember2019-01-012019-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMember2019-01-012019-12-310000895421ms:CurrentlyEmployedbytheFirmMember2021-12-310000895421ms:CurrentlyEmployedbytheFirmMember2020-12-310000895421ms:NoLongerEmployedbytheFirmMember2021-12-310000895421ms:NoLongerEmployedbytheFirmMember2020-12-310000895421ms:InstitutionalSecuritiesSegmentMember2019-12-310000895421ms:GlobalWealthManagementGroupMember2019-12-310000895421ms:AssetManagementSegmentMember2019-12-310000895421ms:InstitutionalSecuritiesSegmentMember2020-01-012020-12-310000895421ms:GlobalWealthManagementGroupMember2020-01-012020-12-310000895421ms:AssetManagementSegmentMember2020-01-012020-12-310000895421ms:InstitutionalSecuritiesSegmentMember2020-12-310000895421ms:GlobalWealthManagementGroupMember2020-12-310000895421ms:AssetManagementSegmentMember2020-12-310000895421ms:InstitutionalSecuritiesSegmentMember2021-01-012021-12-310000895421ms:GlobalWealthManagementGroupMember2021-01-012021-12-310000895421ms:AssetManagementSegmentMember2021-01-012021-12-310000895421ms:InstitutionalSecuritiesSegmentMember2021-12-310000895421ms:GlobalWealthManagementGroupMember2021-12-310000895421ms:AssetManagementSegmentMember2021-12-310000895421ms:EatonVanceCorpMemberms:GlobalWealthManagementGroupAndAssetManagementSegmentMember2021-03-010000895421us-gaap:EmploymentContractsMember2021-12-310000895421us-gaap:CustomerRelationshipsMember2021-12-310000895421us-gaap:TradeNamesMember2021-12-310000895421us-gaap:OtherIntangibleAssetsMember2021-12-310000895421us-gaap:EmploymentContractsMember2020-12-310000895421us-gaap:CustomerRelationshipsMember2020-12-310000895421us-gaap:TradeNamesMember2020-12-310000895421us-gaap:OtherIntangibleAssetsMember2020-12-310000895421ms:InvestmentManagementSegmentMember2021-12-310000895421ms:InvestmentManagementSegmentMember2020-12-310000895421ms:InvestmentManagementSegmentMember2021-01-012021-12-310000895421ms:InvestmentManagementSegmentMember2020-01-012020-12-310000895421ms:InvestmentManagementSegmentMember2019-01-012019-12-310000895421ms:InvestmentManagementSegmentMember2019-10-012019-12-310000895421ms:MitsubishiUfjMorganStanleySecuritiesCoLtdMember2021-01-012021-12-310000895421ms:MitsubishiUfjMorganStanleySecuritiesCoLtdMember2020-01-012020-12-310000895421ms:MitsubishiUfjMorganStanleySecuritiesCoLtdMember2019-01-012019-12-310000895421ms:MorganStanleyMufgSecuritiesCoLtdMember2021-12-310000895421ms:MorganStanleyMufgSecuritiesCoLtdMemberms:MitsubishiUfjFinancialGroupIncMember2021-12-310000895421ms:MitsubishiUfjMorganStanleySecuritiesCoLtdMember2021-12-310000895421ms:MorganStanleyMufgSecuritiesCoLtdMemberms:InstitutionalSecuritiesSegmentMember2021-12-310000895421us-gaap:NonUsMember2021-12-310000895421srt:ParentCompanyMemberms:LongTermDebtFixedRateMember2021-12-310000895421srt:ParentCompanyMemberms:LongTermDebtVariableRateMember2021-12-310000895421srt:SubsidiariesMemberms:LongTermDebtFixedRateMember2021-12-310000895421srt:SubsidiariesMemberms:LongTermDebtVariableRateMember2021-12-310000895421us-gaap:SeniorNotesMember2021-12-310000895421us-gaap:SeniorNotesMember2020-12-310000895421us-gaap:SubordinatedDebtMember2021-01-012021-12-310000895421us-gaap:SubordinatedDebtMember2020-01-012020-12-310000895421ms:FixedRateDebtMemberus-gaap:SecuredDebtMember2021-12-310000895421ms:VariableRateMemberus-gaap:SecuredDebtMember2021-12-310000895421us-gaap:SecuredDebtMember2021-12-310000895421us-gaap:SecuredDebtMember2020-12-310000895421ms:LongTermDebtFixedRateMember2021-12-310000895421ms:LongTermDebtVariableRateMember2021-12-310000895421us-gaap:CommercialLoanMember2021-12-310000895421ms:SecuredLendingFacilitiesMember2021-12-310000895421us-gaap:RealEstateMember2021-12-310000895421ms:SecuritiesBasedLendingandOtherLoansMember2021-12-310000895421ms:CommitmentsForwardStartingReverseRepurchaseAgreementsMember2021-12-310000895421ms:CentralCounterpartyCommitmentMember2021-12-310000895421ms:CommitmentsInvestmentActivitiesMember2021-12-310000895421ms:CommitmentsLettersOfCreditAndOtherFinancialGuaranteesObtainedToSatisfyCollateralRequirementsMember2021-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberus-gaap:DerivativeMember2021-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberus-gaap:DerivativeMember2021-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberus-gaap:DerivativeMember2021-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberus-gaap:DerivativeMember2021-12-310000895421us-gaap:DerivativeMember2021-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberus-gaap:StandbyLettersOfCreditMember2021-12-310000895421us-gaap:StandbyLettersOfCreditMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMember2021-12-310000895421us-gaap:StandbyLettersOfCreditMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMember2021-12-310000895421us-gaap:StandbyLettersOfCreditMemberms:MoreThanFiveYearsFromBalanceSheetDateMember2021-12-310000895421us-gaap:StandbyLettersOfCreditMember2021-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberus-gaap:MarketValueGuaranteeMember2021-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberus-gaap:MarketValueGuaranteeMember2021-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberus-gaap:MarketValueGuaranteeMember2021-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberus-gaap:MarketValueGuaranteeMember2021-12-310000895421us-gaap:MarketValueGuaranteeMember2021-12-310000895421ms:LiquidityFacilitiesGuaranteeMemberms:LessThanTwelveMonthsFromBalanceSheetDateMember2021-12-310000895421ms:LiquidityFacilitiesGuaranteeMemberms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMember2021-12-310000895421ms:LiquidityFacilitiesGuaranteeMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMember2021-12-310000895421ms:LiquidityFacilitiesGuaranteeMemberms:MoreThanFiveYearsFromBalanceSheetDateMember2021-12-310000895421ms:LiquidityFacilitiesGuaranteeMember2021-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:WholeLoanSalesRepresentationsAndWarrantiesMember2021-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:WholeLoanSalesRepresentationsAndWarrantiesMember2021-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:WholeLoanSalesRepresentationsAndWarrantiesMember2021-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:WholeLoanSalesRepresentationsAndWarrantiesMember2021-12-310000895421ms:WholeLoanSalesRepresentationsAndWarrantiesMember2021-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:SecuritizationsRepresentationsAndGuaranteesMember2021-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:SecuritizationsRepresentationsAndGuaranteesMember2021-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:SecuritizationsRepresentationsAndGuaranteesMember2021-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:SecuritizationsRepresentationsAndGuaranteesMember2021-12-310000895421ms:SecuritizationsRepresentationsAndGuaranteesMember2021-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:GeneralPartnerGuaranteeMember2021-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:GeneralPartnerGuaranteeMember2021-12-310000895421ms:GeneralPartnerGuaranteeMemberms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMember2021-12-310000895421ms:GeneralPartnerGuaranteeMemberms:MoreThanFiveYearsFromBalanceSheetDateMember2021-12-310000895421ms:GeneralPartnerGuaranteeMember2021-12-310000895421ms:LessThanTwelveMonthsFromBalanceSheetDateMemberms:ClearingMemberGuaranteeMember2021-12-310000895421ms:MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMemberms:ClearingMemberGuaranteeMember2021-12-310000895421ms:MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMemberms:ClearingMemberGuaranteeMember2021-12-310000895421ms:MoreThanFiveYearsFromBalanceSheetDateMemberms:ClearingMemberGuaranteeMember2021-12-310000895421ms:ClearingMemberGuaranteeMember2021-12-310000895421us-gaap:PendingLitigationMemberms:FinancialGuarantyInsuranceCompanyVMorganStanleyAbsCapitalIIncEtAlTrust2007Nc4Member2021-12-310000895421srt:MaximumMemberus-gaap:PendingLitigationMemberms:DeutscheBankNationalTrustCompany2007Nc4VMorganStanleyMortgageCapitalHoldingsLlcMember2021-12-310000895421us-gaap:PendingLitigationMemberms:UsBankNationalAssociation20072axVMorganStanleyMortgageCapitalHoldingsLlcMember2021-12-310000895421ms:CaseNumber153637AndCaseNumber154353Memberus-gaap:PendingLitigationMember2021-12-31iso4217:EUR0000895421us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberms:MortgageAndAssetBackedSecuritiesMember2021-12-310000895421us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421ms:InvestmentVehiclesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2021-12-310000895421ms:InvestmentVehiclesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-12-310000895421ms:OperatingEntitiesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2021-12-310000895421ms:OperatingEntitiesMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-12-310000895421us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberms:OtherVariableInterestsMember2021-12-310000895421us-gaap:VariableInterestEntityPrimaryBeneficiaryMemberms:OtherVariableInterestsMember2020-12-310000895421us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2021-12-310000895421us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2020-12-310000895421ms:MortgageAndAssetBackedSecuritiesMember2021-12-310000895421us-gaap:CollateralizedDebtObligationsMember2021-12-310000895421ms:MunicipalTenderOptionBondsMember2021-12-310000895421us-gaap:StructuredFinanceMember2021-12-310000895421ms:OtherVariableInterestsMember2021-12-310000895421ms:DebtandEquityInterestsMemberms:MortgageAndAssetBackedSecuritiesMember2021-12-310000895421ms:DebtandEquityInterestsMemberus-gaap:CollateralizedDebtObligationsMember2021-12-310000895421ms:MunicipalTenderOptionBondsMemberms:DebtandEquityInterestsMember2021-12-310000895421ms:DebtandEquityInterestsMemberus-gaap:StructuredFinanceMember2021-12-310000895421ms:OtherVariableInterestsMemberms:DebtandEquityInterestsMember2021-12-310000895421us-gaap:DerivativeFinancialInstrumentsAssetsMemberms:MortgageAndAssetBackedSecuritiesMember2021-12-310000895421us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:CollateralizedDebtObligationsMember2021-12-310000895421ms:MunicipalTenderOptionBondsMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2021-12-310000895421us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:StructuredFinanceMember2021-12-310000895421us-gaap:DerivativeFinancialInstrumentsAssetsMemberms:OtherVariableInterestsMember2021-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberms:MortgageAndAssetBackedSecuritiesMember2021-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberus-gaap:CollateralizedDebtObligationsMember2021-12-310000895421ms:MunicipalTenderOptionBondsMemberms:CommitmentsGuaranteesAndOtherMember2021-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberus-gaap:StructuredFinanceMember2021-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberms:OtherVariableInterestsMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:DebtandEquityInterestsMemberms:MortgageAndAssetBackedSecuritiesMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:DebtandEquityInterestsMemberus-gaap:CollateralizedDebtObligationsMember2021-12-310000895421ms:MunicipalTenderOptionBondsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:DebtandEquityInterestsMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:DebtandEquityInterestsMemberus-gaap:StructuredFinanceMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:OtherVariableInterestsMemberms:DebtandEquityInterestsMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberms:MortgageAndAssetBackedSecuritiesMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:CollateralizedDebtObligationsMember2021-12-310000895421ms:MunicipalTenderOptionBondsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:StructuredFinanceMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberms:OtherVariableInterestsMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MortgageAndAssetBackedSecuritiesMemberus-gaap:AssetsMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:AssetsMemberus-gaap:CollateralizedDebtObligationsMember2021-12-310000895421ms:MunicipalTenderOptionBondsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:AssetsMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:AssetsMemberus-gaap:StructuredFinanceMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:OtherVariableInterestsMemberus-gaap:AssetsMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MortgageAndAssetBackedSecuritiesMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:CollateralizedDebtObligationsMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2021-12-310000895421ms:MunicipalTenderOptionBondsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:StructuredFinanceMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:OtherVariableInterestsMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2021-12-310000895421ms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:CollateralizedDebtObligationsMember2020-12-310000895421ms:MunicipalTenderOptionBondsMember2020-12-310000895421us-gaap:StructuredFinanceMember2020-12-310000895421ms:OtherVariableInterestsMember2020-12-310000895421ms:DebtandEquityInterestsMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421ms:DebtandEquityInterestsMemberus-gaap:CollateralizedDebtObligationsMember2020-12-310000895421ms:MunicipalTenderOptionBondsMemberms:DebtandEquityInterestsMember2020-12-310000895421ms:DebtandEquityInterestsMemberus-gaap:StructuredFinanceMember2020-12-310000895421ms:OtherVariableInterestsMemberms:DebtandEquityInterestsMember2020-12-310000895421us-gaap:DerivativeFinancialInstrumentsAssetsMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:CollateralizedDebtObligationsMember2020-12-310000895421ms:MunicipalTenderOptionBondsMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2020-12-310000895421us-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:StructuredFinanceMember2020-12-310000895421us-gaap:DerivativeFinancialInstrumentsAssetsMemberms:OtherVariableInterestsMember2020-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberus-gaap:CollateralizedDebtObligationsMember2020-12-310000895421ms:MunicipalTenderOptionBondsMemberms:CommitmentsGuaranteesAndOtherMember2020-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberus-gaap:StructuredFinanceMember2020-12-310000895421ms:CommitmentsGuaranteesAndOtherMemberms:OtherVariableInterestsMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:DebtandEquityInterestsMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:DebtandEquityInterestsMemberus-gaap:CollateralizedDebtObligationsMember2020-12-310000895421ms:MunicipalTenderOptionBondsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:DebtandEquityInterestsMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:DebtandEquityInterestsMemberus-gaap:StructuredFinanceMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:OtherVariableInterestsMemberms:DebtandEquityInterestsMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberms:MortgageAndAssetBackedSecuritiesMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:CollateralizedDebtObligationsMember2020-12-310000895421ms:MunicipalTenderOptionBondsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberus-gaap:StructuredFinanceMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsAssetsMemberms:OtherVariableInterestsMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MortgageAndAssetBackedSecuritiesMemberus-gaap:AssetsMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:AssetsMemberus-gaap:CollateralizedDebtObligationsMember2020-12-310000895421ms:MunicipalTenderOptionBondsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:AssetsMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:AssetsMemberus-gaap:StructuredFinanceMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:OtherVariableInterestsMemberus-gaap:AssetsMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:MortgageAndAssetBackedSecuritiesMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:CollateralizedDebtObligationsMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2020-12-310000895421ms:MunicipalTenderOptionBondsMemberus-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:StructuredFinanceMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:OtherVariableInterestsMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:SecuritiesAssetsMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:SecuritiesAssetsMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:CommercialMortgageBackedSecuritiesMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:SecuritiesAssetsMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:CommercialMortgageBackedSecuritiesMemberus-gaap:SecuritiesAssetsMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:SecuritiesAssetsMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberus-gaap:SecuritiesAssetsMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:OtherConsumerAndCommercialLoansMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:SecuritiesAssetsMemberms:OtherConsumerAndCommercialLoansMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberms:OtherConsumerAndCommercialLoansMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:SecuritiesAssetsMemberms:OtherConsumerAndCommercialLoansMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:SecuritiesAssetsMember2021-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000895421us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:SecuritiesAssetsMember2020-12-310000895421us-gaap:ResidentialMortgageMemberms:SpecialPurposeEntitiesMember2021-12-310000895421us-gaap:CommercialMortgageBackedSecuritiesMemberms:SpecialPurposeEntitiesMember2021-12-310000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberms:SpecialPurposeEntitiesMember2021-12-310000895421ms:CreditLinkedNotesAndOtherMemberms:SpecialPurposeEntitiesMember2021-12-310000895421us-gaap:ResidentialMortgageMemberms:InvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-12-310000895421ms:InvestmentGradeMemberus-gaap:CommercialMortgageBackedSecuritiesMemberms:SpecialPurposeEntitiesMember2021-12-310000895421ms:InvestmentGradeMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberms:SpecialPurposeEntitiesMember2021-12-310000895421ms:CreditLinkedNotesAndOtherMemberms:InvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-12-310000895421us-gaap:ResidentialMortgageMemberms:NoninvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-12-310000895421ms:NoninvestmentGradeMemberus-gaap:CommercialMortgageBackedSecuritiesMemberms:SpecialPurposeEntitiesMember2021-12-310000895421ms:NoninvestmentGradeMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberms:SpecialPurposeEntitiesMember2021-12-310000895421ms:NoninvestmentGradeMemberms:CreditLinkedNotesAndOtherMemberms:SpecialPurposeEntitiesMember2021-12-310000895421us-gaap:ResidentialMortgageMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:CommercialMortgageBackedSecuritiesMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:CreditLinkedNotesAndOtherMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:ResidentialMortgageMemberms:InvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:InvestmentGradeMemberus-gaap:CommercialMortgageBackedSecuritiesMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:InvestmentGradeMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:CreditLinkedNotesAndOtherMemberms:InvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:ResidentialMortgageMemberms:NoninvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:NoninvestmentGradeMemberus-gaap:CommercialMortgageBackedSecuritiesMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:NoninvestmentGradeMemberus-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:NoninvestmentGradeMemberms:CreditLinkedNotesAndOtherMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:FairValueInputsLevel2Memberms:InvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:InvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-12-310000895421ms:InvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-12-310000895421us-gaap:FairValueInputsLevel2Memberms:NoninvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:NoninvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-12-310000895421ms:NoninvestmentGradeMemberms:SpecialPurposeEntitiesMember2021-12-310000895421us-gaap:FairValueInputsLevel2Memberms:SpecialPurposeEntitiesMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:SpecialPurposeEntitiesMember2021-12-310000895421ms:SpecialPurposeEntitiesMember2021-12-310000895421us-gaap:FairValueInputsLevel2Memberms:InvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:InvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:InvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:FairValueInputsLevel2Memberms:NoninvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:NoninvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:NoninvestmentGradeMemberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:FairValueInputsLevel2Memberms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:SpecialPurposeEntitiesMember2020-12-310000895421ms:SpecialPurposeEntitiesMember2020-12-310000895421us-gaap:CommercialLoanMemberms:CollateralizedLoanObligationsEntitiesSponsoredByNonAffiliatesMember2021-01-012021-12-310000895421us-gaap:CommercialLoanMemberms:CollateralizedLoanObligationsEntitiesSponsoredByNonAffiliatesMember2020-01-012020-12-310000895421us-gaap:CommercialLoanMemberms:CollateralizedLoanObligationsEntitiesSponsoredByNonAffiliatesMember2019-01-012019-12-310000895421us-gaap:OverTheCounterMemberus-gaap:EquityContractMember2021-12-310000895421us-gaap:OverTheCounterMemberus-gaap:EquityContractMember2020-12-310000895421srt:MaximumMember2021-12-310000895421ms:MorganStanleyBankNationalAssociationMember2021-01-012021-12-310000895421ms:MorganStanleyBankNationalAssociationMember2021-12-310000895421ms:MorganStanleyBankNationalAssociationMember2020-12-310000895421ms:MorganStanleyPrivateBankNationalAssociationMember2021-01-012021-12-310000895421ms:MorganStanleyPrivateBankNationalAssociationMember2021-12-310000895421ms:MorganStanleyPrivateBankNationalAssociationMember2020-12-310000895421ms:MSAndCoMember2021-01-012021-12-310000895421ms:MSAndCoMember2021-12-310000895421ms:MSAndCoMember2020-12-310000895421us-gaap:SeriesAPreferredStockMember2021-12-310000895421us-gaap:SeriesAPreferredStockMember2020-12-310000895421us-gaap:SeriesCPreferredStockMember2021-12-310000895421us-gaap:SeriesCPreferredStockMember2020-12-310000895421us-gaap:SeriesEPreferredStockMember2021-12-310000895421us-gaap:SeriesEPreferredStockMember2020-12-310000895421us-gaap:SeriesFPreferredStockMember2021-12-310000895421us-gaap:SeriesFPreferredStockMember2020-12-310000895421us-gaap:SeriesHPreferredStockMember2021-12-310000895421us-gaap:SeriesHPreferredStockMember2020-12-310000895421ms:SeriesIPreferredStockMember2021-12-310000895421ms:SeriesIPreferredStockMember2020-12-310000895421ms:SeriesJPreferredStockMember2021-12-310000895421ms:SeriesJPreferredStockMember2020-12-310000895421ms:SeriesKPreferredStockMember2021-12-310000895421ms:SeriesKPreferredStockMember2020-12-310000895421ms:SeriesLPreferredStockMember2021-12-310000895421ms:SeriesLPreferredStockMember2020-12-310000895421ms:SeriesMPreferredStockMember2021-12-310000895421ms:SeriesMPreferredStockMember2020-12-310000895421ms:SeriesNPreferredStockMember2021-12-310000895421ms:SeriesNPreferredStockMember2020-12-310000895421ms:SeriesOPreferredStockMember2021-12-310000895421ms:SeriesOPreferredStockMember2020-12-310000895421us-gaap:SeriesHPreferredStockMember2021-11-192021-11-190000895421ms:SeriesJPreferredStockMember2021-03-152021-03-150000895421us-gaap:SeriesGPreferredStockMember2020-01-1500008954212021-06-280000895421us-gaap:SeriesAPreferredStockMember2020-01-012020-12-310000895421us-gaap:SeriesAPreferredStockMember2019-01-012019-12-310000895421us-gaap:SeriesCPreferredStockMember2021-01-012021-12-310000895421us-gaap:SeriesCPreferredStockMember2020-01-012020-12-310000895421us-gaap:SeriesCPreferredStockMember2019-01-012019-12-310000895421us-gaap:SeriesEPreferredStockMember2020-01-012020-12-310000895421us-gaap:SeriesEPreferredStockMember2019-01-012019-12-310000895421us-gaap:SeriesFPreferredStockMember2020-01-012020-12-310000895421us-gaap:SeriesFPreferredStockMember2019-01-012019-12-310000895421us-gaap:SeriesGPreferredStockMember2021-01-012021-12-310000895421us-gaap:SeriesGPreferredStockMember2020-01-012020-12-310000895421us-gaap:SeriesGPreferredStockMember2019-01-012019-12-310000895421us-gaap:SeriesHPreferredStockMember2021-01-012021-12-310000895421us-gaap:SeriesHPreferredStockMember2020-01-012020-12-310000895421us-gaap:SeriesHPreferredStockMember2019-01-012019-12-310000895421ms:SeriesIPreferredStockMember2020-01-012020-12-310000895421ms:SeriesIPreferredStockMember2019-01-012019-12-310000895421ms:SeriesJPreferredStockMember2021-01-012021-12-310000895421ms:SeriesJPreferredStockMember2020-01-012020-12-310000895421ms:SeriesJPreferredStockMember2019-01-012019-12-310000895421ms:SeriesKPreferredStockMember2020-01-012020-12-310000895421ms:SeriesKPreferredStockMember2019-01-012019-12-310000895421ms:SeriesLPreferredStockMember2020-01-012020-12-310000895421ms:SeriesLPreferredStockMember2019-01-012019-12-310000895421ms:SeriesMPreferredStockMember2021-01-012021-12-310000895421ms:SeriesMPreferredStockMember2020-01-012020-12-310000895421ms:SeriesMPreferredStockMember2019-01-012019-12-310000895421ms:SeriesNPreferredStockMember2021-01-012021-12-310000895421ms:SeriesNPreferredStockMember2020-01-012020-12-310000895421ms:SeriesNPreferredStockMember2019-01-012019-12-310000895421ms:SeriesOPreferredStockMember2020-01-012020-12-310000895421ms:SeriesOPreferredStockMember2019-01-012019-12-310000895421us-gaap:AccumulatedTranslationAdjustmentMember2018-12-310000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2018-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2018-12-310000895421ms:AOCIDebtValuationAdjustmentParentMember2018-12-310000895421us-gaap:AccumulatedTranslationAdjustmentMember2019-01-012019-12-310000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2019-01-012019-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-01-012019-12-310000895421ms:AOCIDebtValuationAdjustmentParentMember2019-01-012019-12-310000895421us-gaap:AccumulatedTranslationAdjustmentMember2019-12-310000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2019-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-310000895421ms:AOCIDebtValuationAdjustmentParentMember2019-12-310000895421us-gaap:AccumulatedTranslationAdjustmentMember2020-01-012020-12-310000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-01-012020-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-01-012020-12-310000895421ms:AOCIDebtValuationAdjustmentParentMember2020-01-012020-12-310000895421us-gaap:AccumulatedTranslationAdjustmentMember2020-12-310000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310000895421ms:AOCIDebtValuationAdjustmentParentMember2020-12-310000895421us-gaap:AccumulatedTranslationAdjustmentMember2021-01-012021-12-310000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-01-012021-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-01-012021-12-310000895421ms:AOCIDebtValuationAdjustmentParentMember2021-01-012021-12-310000895421us-gaap:AccumulatedTranslationAdjustmentMember2021-12-310000895421us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-12-310000895421ms:AOCIDebtValuationAdjustmentParentMember2021-12-310000895421us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2021-01-012021-12-310000895421us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember2021-01-012021-12-310000895421us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2021-01-012021-12-310000895421us-gaap:AccumulatedNetInvestmentGainLossAttributableToNoncontrollingInterestMember2021-01-012021-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2021-01-012021-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember2021-01-012021-12-310000895421ms:AOCIDebtValuationAdjustmentIncludingNoncontrollingInterestMember2021-01-012021-12-310000895421ms:AOCIDebtValuationAdjustmentNoncontrollingInterestMember2021-01-012021-12-310000895421us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2020-01-012020-12-310000895421us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember2020-01-012020-12-310000895421us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2020-01-012020-12-310000895421us-gaap:AccumulatedNetInvestmentGainLossAttributableToNoncontrollingInterestMember2020-01-012020-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2020-01-012020-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember2020-01-012020-12-310000895421ms:AOCIDebtValuationAdjustmentIncludingNoncontrollingInterestMember2020-01-012020-12-310000895421ms:AOCIDebtValuationAdjustmentNoncontrollingInterestMember2020-01-012020-12-310000895421us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2019-01-012019-12-310000895421us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember2019-01-012019-12-310000895421us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2019-01-012019-12-310000895421us-gaap:AccumulatedNetInvestmentGainLossAttributableToNoncontrollingInterestMember2019-01-012019-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2019-01-012019-12-310000895421us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember2019-01-012019-12-310000895421ms:AOCIDebtValuationAdjustmentIncludingNoncontrollingInterestMember2019-01-012019-12-310000895421ms:AOCIDebtValuationAdjustmentNoncontrollingInterestMember2019-01-012019-12-310000895421us-gaap:RestrictedStockUnitsRSUMember2021-01-012021-12-310000895421us-gaap:RestrictedStockUnitsRSUMember2020-01-012020-12-310000895421us-gaap:RestrictedStockUnitsRSUMember2019-01-012019-12-310000895421us-gaap:PerformanceSharesMember2021-01-012021-12-310000895421us-gaap:PerformanceSharesMember2020-01-012020-12-310000895421us-gaap:PerformanceSharesMember2019-01-012019-12-310000895421us-gaap:RestrictedStockUnitsRSUMembersrt:MinimumMember2021-01-012021-12-310000895421srt:MaximumMemberus-gaap:RestrictedStockUnitsRSUMember2021-01-012021-12-310000895421us-gaap:RestrictedStockUnitsRSUMember2020-12-310000895421us-gaap:RestrictedStockUnitsRSUMember2021-12-310000895421us-gaap:PerformanceSharesMembersrt:MinimumMember2021-01-012021-12-310000895421us-gaap:PerformanceSharesMembersrt:MaximumMember2021-01-012021-12-310000895421us-gaap:PerformanceSharesMember2021-12-310000895421us-gaap:PerformanceSharesMemberms:MorganStanleyAverageReturnOnEquityExcludingCertainAdjustmentsMember2021-01-012021-12-310000895421us-gaap:PerformanceSharesMemberms:MorganStanleyAverageReturnOnEquityExcludingCertainAdjustmentsMember2020-01-012020-12-310000895421us-gaap:PerformanceSharesMemberms:MorganStanleyAverageReturnOnEquityExcludingCertainAdjustmentsMember2019-01-012019-12-310000895421us-gaap:PerformanceSharesMemberms:MorganStanleyTotalShareholderReturnRelativeToTotalShareholderReturnOfStandardPoors500FinancialsSectorIndexMember2021-01-012021-12-310000895421us-gaap:PerformanceSharesMemberms:MorganStanleyTotalShareholderReturnRelativeToTotalShareholderReturnOfStandardPoors500FinancialsSectorIndexMember2020-01-012020-12-310000895421us-gaap:PerformanceSharesMemberms:MorganStanleyTotalShareholderReturnRelativeToTotalShareholderReturnOfStandardPoors500FinancialsSectorIndexMember2019-01-012019-12-310000895421ms:CurrentPerformanceYearDeferredCompensationAwardsMember2021-01-012021-12-310000895421ms:PriorPerformanceYearDeferredCompensationAwardsMember2021-01-012021-12-310000895421ms:PriorPriorPerformanceYearDeferredCompensationAwardsMember2021-01-012021-12-310000895421us-gaap:PensionPlansDefinedBenefitMember2021-01-012021-12-310000895421us-gaap:PensionPlansDefinedBenefitMember2020-01-012020-12-310000895421us-gaap:PensionPlansDefinedBenefitMember2019-01-012019-12-310000895421us-gaap:PensionPlansDefinedBenefitMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMember2019-12-310000895421us-gaap:PensionPlansDefinedBenefitMember2018-12-310000895421us-gaap:PensionPlansDefinedBenefitMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2021-12-310000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000895421us-gaap:DerivativeMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:DerivativeMemberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000895421us-gaap:DerivativeMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000895421us-gaap:DerivativeMemberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberms:OtherReceivablesMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberms:OtherReceivablesMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberms:OtherReceivablesMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberms:OtherReceivablesMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetsMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetsMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetsMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetsMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:MoneyMarketFundsMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberms:ForeignFixedIncomeFundsMember2021-12-310000895421ms:ForeignMoneyMarketFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberms:ForeignTargetedCashFlowFundsMember2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-12-310000895421ms:OtherPayablesMemberus-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Memberms:OtherPayablesMember2021-12-310000895421us-gaap:FairValueInputsLevel3Memberms:OtherPayablesMember2021-12-310000895421ms:OtherPayablesMember2021-12-310000895421us-gaap:FairValueInputsLevel1Member2021-12-310000895421us-gaap:FairValueInputsLevel2Member2021-12-310000895421us-gaap:FairValueInputsLevel3Member2021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:CashAndCashEquivalentsMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2020-12-310000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000895421us-gaap:CollateralizedDebtObligationsMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000895421us-gaap:DerivativeMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:DerivativeMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000895421us-gaap:DerivativeMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000895421us-gaap:DerivativeMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberms:OtherReceivablesMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberms:OtherReceivablesMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberms:OtherReceivablesMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberms:OtherReceivablesMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetsMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetsMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetsMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:AssetsMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:MoneyMarketFundsMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberms:ForeignFixedIncomeFundsMember2020-12-310000895421ms:ForeignMoneyMarketFundsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberms:ForeignTargetedCashFlowFundsMember2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000895421ms:OtherPayablesMemberus-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Memberms:OtherPayablesMember2020-12-310000895421us-gaap:FairValueInputsLevel3Memberms:OtherPayablesMember2020-12-310000895421ms:OtherPayablesMember2020-12-310000895421us-gaap:FairValueInputsLevel1Member2020-12-310000895421us-gaap:FairValueInputsLevel2Member2020-12-310000895421us-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2019-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-12-310000895421us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2021-12-310000895421us-gaap:QualifiedPlanMember2021-12-310000895421ms:MorganStanley401kPlanMember2021-01-012021-12-310000895421ms:MorganStanley401kPlanMember2020-01-012020-12-310000895421ms:MorganStanley401kPlanMember2019-01-012019-12-310000895421ms:ParticipantsOfACertainCompensationLevelMemberms:MorganStanley401kPlanMember2021-01-012021-12-310000895421ms:MorganStanley401kPlanMemberms:EligibleUsEmployeesWithEligiblePayLessThanOrEqualToOneHundredThousandsDollarsMember2021-01-012021-12-310000895421us-gaap:ForeignPlanMember2021-01-012021-12-310000895421us-gaap:ForeignPlanMember2020-01-012020-12-310000895421us-gaap:ForeignPlanMember2019-01-012019-12-310000895421country:GB2021-01-012021-12-310000895421country:GB2020-01-012020-12-310000895421country:GB2019-01-012019-12-310000895421country:JP2021-01-012021-12-310000895421country:JP2020-01-012020-12-310000895421country:JP2019-01-012019-12-310000895421country:HK2021-01-012021-12-310000895421country:HK2020-01-012020-12-310000895421country:HK2019-01-012019-12-310000895421ms:OtherCountriesMember2021-01-012021-12-310000895421ms:OtherCountriesMember2020-01-012020-12-310000895421ms:OtherCountriesMember2019-01-012019-12-310000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-12-310000895421us-gaap:OperatingSegmentsMemberms:WealthManagementSegmentMember2021-01-012021-12-310000895421us-gaap:OperatingSegmentsMemberms:InvestmentManagementSegmentMember2021-01-012021-12-310000895421us-gaap:IntersegmentEliminationMember2021-01-012021-12-310000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMember2020-01-012020-12-310000895421us-gaap:OperatingSegmentsMemberms:WealthManagementSegmentMember2020-01-012020-12-310000895421us-gaap:OperatingSegmentsMemberms:InvestmentManagementSegmentMember2020-01-012020-12-310000895421us-gaap:IntersegmentEliminationMember2020-01-012020-12-310000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMember2019-01-012019-12-310000895421us-gaap:OperatingSegmentsMemberms:WealthManagementSegmentMember2019-01-012019-12-310000895421us-gaap:OperatingSegmentsMemberms:InvestmentManagementSegmentMember2019-01-012019-12-310000895421us-gaap:IntersegmentEliminationMember2019-01-012019-12-3100008954212019-10-012019-12-310000895421ms:InstitutionalSecuritiesSegmentMember2019-10-012019-12-310000895421ms:WealthManagementSegmentMember2019-10-012019-12-310000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:InvestmentAdviceMemberus-gaap:OperatingSegmentsMember2021-01-012021-12-310000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:InvestmentAdviceMemberus-gaap:OperatingSegmentsMember2020-01-012020-12-310000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:InvestmentAdviceMemberus-gaap:OperatingSegmentsMember2019-01-012019-12-310000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMemberms:UnderwritingMember2021-01-012021-12-310000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMemberms:UnderwritingMember2020-01-012020-12-310000895421ms:InstitutionalSecuritiesSegmentMemberus-gaap:OperatingSegmentsMemberms:UnderwritingMember2019-01-012019-12-310000895421us-gaap:InterestRateContractMember2021-01-012021-12-310000895421us-gaap:InterestRateContractMember2020-01-012020-12-310000895421us-gaap:InterestRateContractMember2019-01-012019-12-310000895421us-gaap:ForeignExchangeContractMember2021-01-012021-12-310000895421us-gaap:ForeignExchangeContractMember2020-01-012020-12-310000895421us-gaap:ForeignExchangeContractMember2019-01-012019-12-310000895421ms:EquityAndIndexContractMember2021-01-012021-12-310000895421ms:EquityAndIndexContractMember2020-01-012020-12-310000895421ms:EquityAndIndexContractMember2019-01-012019-12-310000895421ms:CommodityAndOtherContractsMember2021-01-012021-12-310000895421ms:CommodityAndOtherContractsMember2020-01-012020-12-310000895421ms:CommodityAndOtherContractsMember2019-01-012019-12-310000895421us-gaap:CreditRiskContractMember2021-01-012021-12-310000895421us-gaap:CreditRiskContractMember2020-01-012020-12-310000895421us-gaap:CreditRiskContractMember2019-01-012019-12-310000895421srt:AmericasMember2021-01-012021-12-310000895421srt:AmericasMember2020-01-012020-12-310000895421srt:AmericasMember2019-01-012019-12-310000895421us-gaap:EMEAMember2021-01-012021-12-310000895421us-gaap:EMEAMember2020-01-012020-12-310000895421us-gaap:EMEAMember2019-01-012019-12-310000895421srt:AsiaMember2021-01-012021-12-310000895421srt:AsiaMember2020-01-012020-12-310000895421srt:AsiaMember2019-01-012019-12-310000895421country:US2021-01-012021-12-310000895421country:US2020-01-012020-12-310000895421country:US2019-01-012019-12-310000895421us-gaap:NonUsMember2021-01-012021-12-310000895421us-gaap:NonUsMember2020-01-012020-12-310000895421us-gaap:NonUsMember2019-01-012019-12-310000895421ms:WealthManagementSegmentMember2021-12-310000895421ms:WealthManagementSegmentMember2020-12-310000895421srt:AmericasMember2021-12-310000895421srt:AmericasMember2020-12-310000895421us-gaap:EMEAMember2021-12-310000895421us-gaap:EMEAMember2020-12-310000895421srt:AsiaMember2021-12-310000895421srt:AsiaMember2020-12-310000895421srt:ParentCompanyMember2021-01-012021-12-310000895421srt:ParentCompanyMember2020-01-012020-12-310000895421srt:ParentCompanyMember2019-01-012019-12-310000895421srt:ParentCompanyMember2021-12-310000895421srt:ParentCompanyMember2020-12-310000895421srt:ParentCompanyMember2019-12-310000895421srt:ParentCompanyMember2018-12-310000895421us-gaap:WarrantMembersrt:ParentCompanyMember2021-12-310000895421us-gaap:WarrantMembersrt:ParentCompanyMember2020-12-310000895421srt:ParentCompanyMemberus-gaap:CapitalLeaseObligationsMember2021-12-310000895421srt:ParentCompanyMemberus-gaap:CapitalLeaseObligationsMember2020-12-31