false2021FY0000896159December 31P1Y0M0DP10Y0M0DP3Y0M0D1.09.033http://fasb.org/us-gaap/2021-01-31#OtherLiabilitieshttp://fasb.org/us-gaap/2021-01-31#OtherLiabilities121200008961592021-01-012021-12-310000896159us-gaap:CommonClassAMember2021-01-012021-12-310000896159cb:INASeniorNotesDueDecember2024Member2021-01-012021-12-310000896159cb:INASeniorNotesDueJune2027Member2021-01-012021-12-310000896159cb:INASeniorNotesDueMarch2028Member2021-01-012021-12-310000896159cb:INASeniorNotesDueDecember2029Member2021-01-012021-12-310000896159cb:INASeniorNotesDueJune2031Member2021-01-012021-12-310000896159cb:INASeniorNotesDueMarch2038Member2021-01-012021-12-3100008961592021-06-30iso4217:USD00008961592022-02-10xbrli:shares00008961592021-12-31iso4217:CHFxbrli:shares00008961592020-12-3100008961592020-01-012020-12-3100008961592019-01-012019-12-31iso4217:USDxbrli:shares0000896159us-gaap:CommonStockMember2020-12-310000896159us-gaap:CommonStockMember2019-12-310000896159us-gaap:CommonStockMember2018-12-310000896159us-gaap:CommonStockMember2021-01-012021-12-310000896159us-gaap:CommonStockMember2020-01-012020-12-310000896159us-gaap:CommonStockMember2019-01-012019-12-310000896159us-gaap:CommonStockMember2021-12-310000896159us-gaap:TreasuryStockMember2020-12-310000896159us-gaap:TreasuryStockMember2019-12-310000896159us-gaap:TreasuryStockMember2018-12-310000896159us-gaap:TreasuryStockMember2021-01-012021-12-310000896159us-gaap:TreasuryStockMember2020-01-012020-12-310000896159us-gaap:TreasuryStockMember2019-01-012019-12-310000896159us-gaap:TreasuryStockMember2021-12-310000896159us-gaap:AdditionalPaidInCapitalMember2020-12-310000896159us-gaap:AdditionalPaidInCapitalMember2019-12-310000896159us-gaap:AdditionalPaidInCapitalMember2018-12-310000896159us-gaap:AdditionalPaidInCapitalMember2021-01-012021-12-310000896159us-gaap:AdditionalPaidInCapitalMember2020-01-012020-12-310000896159us-gaap:AdditionalPaidInCapitalMember2019-01-012019-12-310000896159us-gaap:AdditionalPaidInCapitalMember2021-12-310000896159us-gaap:RetainedEarningsMember2020-12-310000896159us-gaap:RetainedEarningsMember2019-12-310000896159us-gaap:RetainedEarningsMember2018-12-310000896159us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2020-12-310000896159us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310000896159us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2018-12-310000896159us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2020-12-310000896159us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2019-12-310000896159us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember2018-12-310000896159us-gaap:RetainedEarningsMember2021-01-012021-12-310000896159us-gaap:RetainedEarningsMember2020-01-012020-12-310000896159us-gaap:RetainedEarningsMember2019-01-012019-12-310000896159us-gaap:RetainedEarningsMember2021-12-310000896159us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-12-310000896159us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2019-12-310000896159us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2018-12-310000896159us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-01-012021-12-310000896159us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-01-012020-12-310000896159us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2019-01-012019-12-310000896159us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-12-310000896159us-gaap:AccumulatedTranslationAdjustmentMember2020-12-310000896159us-gaap:AccumulatedTranslationAdjustmentMember2019-12-310000896159us-gaap:AccumulatedTranslationAdjustmentMember2018-12-310000896159us-gaap:AccumulatedTranslationAdjustmentMember2021-01-012021-12-310000896159us-gaap:AccumulatedTranslationAdjustmentMember2020-01-012020-12-310000896159us-gaap:AccumulatedTranslationAdjustmentMember2019-01-012019-12-310000896159us-gaap:AccumulatedTranslationAdjustmentMember2021-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2018-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-01-012021-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-01-012020-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-01-012019-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-12-310000896159us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-310000896159us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000896159us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-3100008961592019-12-3100008961592018-12-310000896159srt:MinimumMember2021-01-012021-12-310000896159srt:MaximumMember2021-01-012021-12-310000896159us-gaap:SellingAndMarketingExpenseMember2021-01-012021-12-310000896159us-gaap:SellingAndMarketingExpenseMember2020-01-012020-12-310000896159us-gaap:SellingAndMarketingExpenseMember2019-01-012019-12-31xbrli:pure0000896159cb:TheChubbCorporationMemberus-gaap:DebtSecuritiesMember2021-01-012021-12-310000896159srt:MinimumMember2021-12-310000896159srt:MaximumMember2021-12-310000896159cb:FairValueAdjustmenttoAcquiredLossReservesMembercb:TheChubbCorporationMember2021-12-310000896159cb:FairValueAdjustmenttoAcquiredLossReservesMembercb:TheChubbCorporationMember2020-12-310000896159us-gaap:SoftwareDevelopmentMember2021-12-310000896159us-gaap:BuildingMember2021-12-310000896159srt:MinimumMemberus-gaap:SoftwareDevelopmentMember2021-01-012021-12-310000896159srt:MaximumMemberus-gaap:SoftwareDevelopmentMember2021-01-012021-12-310000896159us-gaap:SoftwareDevelopmentMember2021-01-012021-12-310000896159srt:MaximumMemberus-gaap:BuildingMember2021-01-012021-12-310000896159srt:MinimumMember2020-12-310000896159srt:MaximumMember2020-12-310000896159srt:AsiaPacificMembercb:CignasLifeInsuranceBusinessInAsiaPacificMarketsMember2021-10-070000896159cb:DirectOwnershipMembercountry:CNcb:HuataiGroupMember2021-12-310000896159country:CNcb:HuataiGroupMember2021-01-012021-12-310000896159country:CNcb:HuataiGroupMember2021-12-310000896159us-gaap:SubsequentEventMembercountry:CNcb:HuataiGroupMember2022-01-012022-03-310000896159country:CNcb:HuataiGroupMember2020-01-012020-12-310000896159us-gaap:USTreasuryAndGovernmentMember2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMember2021-12-310000896159us-gaap:CorporateDebtSecuritiesMember2021-12-310000896159us-gaap:MortgageBackedSecuritiesMember2021-12-310000896159us-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000896159us-gaap:USTreasuryAndGovernmentMember2020-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000896159us-gaap:CorporateDebtSecuritiesMember2020-12-310000896159us-gaap:MortgageBackedSecuritiesMember2020-12-310000896159us-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000896159srt:StandardPoorsAAARatingMember2021-12-310000896159srt:StandardPoorsAAARatingMember2020-12-310000896159srt:StandardPoorsAARatingMember2021-12-310000896159srt:StandardPoorsAARatingMember2020-12-310000896159srt:StandardPoorsARatingMember2021-12-310000896159srt:StandardPoorsARatingMember2020-12-310000896159srt:StandardPoorsBBBRatingMember2021-12-310000896159srt:StandardPoorsBBBRatingMember2020-12-310000896159srt:StandardPoorsBBRatingMember2021-12-310000896159srt:StandardPoorsBBRatingMember2020-12-310000896159cb:OtherMember2021-12-310000896159cb:OtherMember2020-12-310000896159us-gaap:FixedMaturitiesMemberus-gaap:USTreasuryAndGovernmentMember2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FixedMaturitiesMember2021-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FixedMaturitiesMember2021-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FixedMaturitiesMember2021-12-310000896159us-gaap:FixedMaturitiesMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000896159us-gaap:FixedMaturitiesMember2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FixedMaturitiesMember2020-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FixedMaturitiesMember2020-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FixedMaturitiesMember2020-12-310000896159us-gaap:FixedMaturitiesMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000896159us-gaap:FixedMaturitiesMember2020-12-310000896159us-gaap:DebtSecuritiesMember2019-01-012019-12-310000896159us-gaap:DebtSecuritiesMember2021-01-012021-12-310000896159us-gaap:DebtSecuritiesMember2020-01-012020-12-310000896159us-gaap:FixedMaturitiesMember2021-01-012021-12-310000896159us-gaap:FixedMaturitiesMember2020-01-012020-12-310000896159us-gaap:FixedMaturitiesMember2019-01-012019-12-310000896159us-gaap:AccountingStandardsUpdate201613Member2021-01-012021-12-310000896159us-gaap:AccountingStandardsUpdate201613Member2020-01-012020-12-310000896159us-gaap:AccountingStandardsUpdate201613Member2019-01-012019-12-310000896159us-gaap:EquitySecuritiesMember2021-01-012021-12-310000896159us-gaap:EquitySecuritiesMember2020-01-012020-12-310000896159us-gaap:EquitySecuritiesMember2019-01-012019-12-310000896159us-gaap:OtherInvestmentsMember2021-01-012021-12-310000896159us-gaap:OtherInvestmentsMember2020-01-012020-12-310000896159us-gaap:OtherInvestmentsMember2019-01-012019-12-310000896159us-gaap:ForeignExchangeContractMember2021-01-012021-12-310000896159us-gaap:ForeignExchangeContractMember2020-01-012020-12-310000896159us-gaap:ForeignExchangeContractMember2019-01-012019-12-310000896159us-gaap:EquityContractMember2021-01-012021-12-310000896159us-gaap:EquityContractMember2020-01-012020-12-310000896159us-gaap:EquityContractMember2019-01-012019-12-310000896159us-gaap:OtherContractMember2021-01-012021-12-310000896159us-gaap:OtherContractMember2020-01-012020-12-310000896159us-gaap:OtherContractMember2019-01-012019-12-310000896159cb:OtherMember2021-01-012021-12-310000896159cb:OtherMember2020-01-012020-12-310000896159cb:OtherMember2019-01-012019-12-310000896159us-gaap:AvailableforsaleSecuritiesMember2021-01-012021-12-310000896159us-gaap:AvailableforsaleSecuritiesMember2020-01-012020-12-310000896159us-gaap:AvailableforsaleSecuritiesMember2019-01-012019-12-310000896159us-gaap:HeldtomaturitySecuritiesMember2021-01-012021-12-310000896159us-gaap:HeldtomaturitySecuritiesMember2020-01-012020-12-310000896159us-gaap:HeldtomaturitySecuritiesMember2019-01-012019-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:AccountingStandardsUpdate201601Member2021-01-012021-12-310000896159us-gaap:OtherInvestmentsMemberus-gaap:AccountingStandardsUpdate201601Member2021-01-012021-12-310000896159cb:EquitysecuritiesandotherinvestmentsMemberus-gaap:AccountingStandardsUpdate201601Member2021-01-012021-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:AccountingStandardsUpdate201601Member2020-01-012020-12-310000896159us-gaap:OtherInvestmentsMemberus-gaap:AccountingStandardsUpdate201601Member2020-01-012020-12-310000896159cb:EquitysecuritiesandotherinvestmentsMemberus-gaap:AccountingStandardsUpdate201601Member2020-01-012020-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:AccountingStandardsUpdate201601Member2019-01-012019-12-310000896159us-gaap:OtherInvestmentsMemberus-gaap:AccountingStandardsUpdate201601Member2019-01-012019-12-310000896159cb:EquitysecuritiesandotherinvestmentsMemberus-gaap:AccountingStandardsUpdate201601Member2019-01-012019-12-310000896159us-gaap:AccountingStandardsUpdate201613Member2020-12-310000896159us-gaap:AccountingStandardsUpdate201613Member2020-01-012020-01-010000896159us-gaap:AccountingStandardsUpdate201613Member2020-01-010000896159cb:PartiallyownedInvestmentCompaniesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:EquityMethodInvestmentsMember2021-12-310000896159cb:PartiallyownedInvestmentCompaniesMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:EquityMethodInvestmentsMember2020-12-310000896159us-gaap:CostmethodInvestmentsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:LimitedPartnerMember2021-12-310000896159us-gaap:CostmethodInvestmentsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:LimitedPartnerMember2020-12-310000896159cb:InvestmentFundsMemberus-gaap:CostmethodInvestmentsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2021-12-310000896159cb:InvestmentFundsMemberus-gaap:CostmethodInvestmentsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000896159us-gaap:EstimateOfFairValueFairValueDisclosureMember2021-12-310000896159us-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000896159us-gaap:LifeInsuranceSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMembercb:OtherAccountingMethodMember2021-12-310000896159us-gaap:LifeInsuranceSegmentMemberus-gaap:EstimateOfFairValueFairValueDisclosureMembercb:OtherAccountingMethodMember2020-12-310000896159us-gaap:PolicyLoansMemberus-gaap:EstimateOfFairValueFairValueDisclosureMembercb:OtherAccountingMethodMember2021-12-310000896159us-gaap:PolicyLoansMemberus-gaap:EstimateOfFairValueFairValueDisclosureMembercb:OtherAccountingMethodMember2020-12-310000896159us-gaap:EstimateOfFairValueFairValueDisclosureMembercb:OtherAccountingMethodMembercb:NonqualifiedseparateaccountassetsMember2021-12-310000896159us-gaap:EstimateOfFairValueFairValueDisclosureMembercb:OtherAccountingMethodMembercb:NonqualifiedseparateaccountassetsMember2020-12-310000896159cb:OtherMemberus-gaap:EstimateOfFairValueFairValueDisclosureMembercb:OtherAccountingMethodMember2021-12-310000896159cb:OtherMemberus-gaap:EstimateOfFairValueFairValueDisclosureMembercb:OtherAccountingMethodMember2020-12-310000896159cb:FinancialMembersrt:MinimumMember2020-01-012020-12-310000896159cb:FinancialMembersrt:MinimumMember2021-01-012021-12-310000896159cb:FinancialMembersrt:MaximumMember2021-01-012021-12-310000896159cb:FinancialMembersrt:MaximumMember2020-01-012020-12-310000896159cb:FinancialMember2021-12-310000896159cb:FinancialMember2020-12-310000896159srt:MinimumMemberus-gaap:RealEstateFundsMember2021-01-012021-12-310000896159srt:MinimumMemberus-gaap:RealEstateFundsMember2020-01-012020-12-310000896159srt:MaximumMemberus-gaap:RealEstateFundsMember2021-01-012021-12-310000896159srt:MaximumMemberus-gaap:RealEstateFundsMember2020-01-012020-12-310000896159us-gaap:RealEstateFundsMember2021-12-310000896159us-gaap:RealEstateFundsMember2020-12-310000896159srt:MinimumMembercb:DistressedAlternativeInvestmentsMember2020-01-012020-12-310000896159srt:MinimumMembercb:DistressedAlternativeInvestmentsMember2021-01-012021-12-310000896159srt:MaximumMembercb:DistressedAlternativeInvestmentsMember2021-01-012021-12-310000896159srt:MaximumMembercb:DistressedAlternativeInvestmentsMember2020-01-012020-12-310000896159cb:DistressedAlternativeInvestmentsMember2021-12-310000896159cb:DistressedAlternativeInvestmentsMember2020-12-310000896159srt:MinimumMembercb:PrivateCreditAlternativeInvestmentsMember2020-01-012020-12-310000896159srt:MinimumMembercb:PrivateCreditAlternativeInvestmentsMember2021-01-012021-12-310000896159srt:MaximumMembercb:PrivateCreditAlternativeInvestmentsMember2020-01-012020-12-310000896159srt:MaximumMembercb:PrivateCreditAlternativeInvestmentsMember2021-01-012021-12-310000896159cb:PrivateCreditAlternativeInvestmentsMember2021-12-310000896159cb:PrivateCreditAlternativeInvestmentsMember2020-12-310000896159us-gaap:PrivateEquityFundsMembersrt:MinimumMember2021-01-012021-12-310000896159us-gaap:PrivateEquityFundsMembersrt:MinimumMember2020-01-012020-12-310000896159srt:MaximumMemberus-gaap:PrivateEquityFundsMember2021-01-012021-12-310000896159srt:MaximumMemberus-gaap:PrivateEquityFundsMember2020-01-012020-12-310000896159us-gaap:PrivateEquityFundsMember2021-12-310000896159us-gaap:PrivateEquityFundsMember2020-12-310000896159srt:MinimumMembercb:VintageAlternativeInvestmentsMember2021-01-012021-12-310000896159srt:MinimumMembercb:VintageAlternativeInvestmentsMember2020-01-012020-12-310000896159srt:MaximumMembercb:VintageAlternativeInvestmentsMember2020-01-012020-12-310000896159srt:MaximumMembercb:VintageAlternativeInvestmentsMember2021-01-012021-12-310000896159cb:VintageAlternativeInvestmentsMember2021-12-310000896159cb:VintageAlternativeInvestmentsMember2020-12-310000896159cb:InvestmentFundsAlternativeInvestmentsMember2021-12-310000896159cb:InvestmentFundsAlternativeInvestmentsMember2020-12-31cb:partnerships0000896159country:CNcb:HuataiGroupMember2020-12-310000896159country:CNcb:HuataiLifeInsuranceCo.Member2021-12-310000896159country:CNcb:HuataiLifeInsuranceCo.Member2020-12-310000896159country:BMcb:FreisenbruchMeyerMember2021-12-310000896159country:BMcb:FreisenbruchMeyerMember2020-12-310000896159cb:ChubbArabiaCooperativeInsuranceCompanyMembercountry:SA2021-12-310000896159cb:ChubbArabiaCooperativeInsuranceCompanyMembercountry:SA2020-12-310000896159cb:RussianReinsuranceCompanyMembercountry:RU2021-12-310000896159cb:RussianReinsuranceCompanyMembercountry:RU2020-12-310000896159country:BMcb:ABRReinsuranceCapitalHoldingsLtd.Member2021-12-310000896159country:BMcb:ABRReinsuranceCapitalHoldingsLtd.Member2020-12-310000896159cb:TotalDirectandIndirectMembercountry:CNcb:HuataiLifeInsuranceCo.Member2021-12-310000896159cb:DirectOwnershipMembercountry:CNcb:HuataiLifeInsuranceCo.Member2021-12-310000896159cb:IndirectOwnershipMembercountry:CNcb:HuataiLifeInsuranceCo.Member2021-12-310000896159us-gaap:SubsequentEventMembercountry:CNcb:HuataiGroupMember2022-01-012022-12-310000896159us-gaap:ShortTermInvestmentsMember2021-01-012021-12-310000896159us-gaap:ShortTermInvestmentsMember2020-01-012020-12-310000896159us-gaap:ShortTermInvestmentsMember2019-01-012019-12-310000896159cb:OtherinterestincomeMember2021-01-012021-12-310000896159cb:OtherinterestincomeMember2020-01-012020-12-310000896159cb:OtherinterestincomeMember2019-01-012019-12-310000896159cb:TheChubbCorporationMember2021-01-012021-12-310000896159cb:TheChubbCorporationMember2020-01-012020-12-310000896159cb:TheChubbCorporationMember2019-01-012019-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USTreasuryAndGovernmentMember2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMember2021-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMember2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesMember2021-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesMember2021-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:FairValueMeasurementsRecurringMember2021-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000896159cb:InvestmentFundsLimitedPartnershipsPartiallyOwnedInvestmentCompaniesFairValueMember2021-12-310000896159us-gaap:PolicyLoansMember2021-12-310000896159us-gaap:OtherInvestmentsMember2021-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USTreasuryAndGovernmentMember2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMember2020-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USTreasuryAndGovernmentMember2020-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:FairValueMeasurementsRecurringMember2020-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000896159cb:InvestmentFundsLimitedPartnershipsPartiallyOwnedInvestmentCompaniesFairValueMember2020-12-310000896159us-gaap:PolicyLoansMember2020-12-310000896159us-gaap:OtherInvestmentsMember2020-12-310000896159srt:WeightedAverageMember2021-12-310000896159srt:WeightedAverageMember2021-01-012021-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:OtherLongTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-12-310000896159us-gaap:OtherLongTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueInputsLevel3Member2021-01-012021-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:OtherLongTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2019-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2019-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2019-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2019-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2019-12-310000896159us-gaap:OtherLongTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2019-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueInputsLevel3Member2019-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-12-310000896159us-gaap:OtherLongTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueInputsLevel3Member2020-01-012020-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2018-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2018-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2018-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2018-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2018-12-310000896159us-gaap:OtherLongTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2018-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueInputsLevel3Member2018-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2019-01-012019-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2019-01-012019-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2019-01-012019-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2019-01-012019-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2019-01-012019-12-310000896159us-gaap:OtherLongTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2019-01-012019-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMemberus-gaap:FairValueInputsLevel3Member2019-01-012019-12-310000896159us-gaap:FairValueInputsLevel1Memberus-gaap:USTreasuryAndGovernmentMember2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:USTreasuryAndGovernmentMember2021-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:CorporateDebtSecuritiesMember2021-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2021-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-12-310000896159us-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000896159us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2021-12-310000896159us-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:FairValueInputsLevel2Member2021-12-310000896159us-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:CarryingReportedAmountFairValueDisclosureMember2021-12-310000896159us-gaap:FairValueInputsLevel1Memberus-gaap:USTreasuryAndGovernmentMember2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:USTreasuryAndGovernmentMember2020-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:CorporateDebtSecuritiesMember2020-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:MortgageBackedSecuritiesMember2020-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000896159us-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000896159us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000896159us-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:FairValueInputsLevel2Member2020-12-310000896159us-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000896159cb:ReinsuranceLargestReinsurersMember2021-12-310000896159cb:ReinsuranceOtherReinsurersBalancesRatedMinusOrBetterMember2021-12-310000896159cb:ReinsuranceOtherReinsurersBalancesWithRatingsLowerThanMinusOrNotRatedMember2021-12-310000896159cb:ReinsuranceOtherPoolsAndGovernmentAgenciesMember2021-12-310000896159cb:ReinsuranceStructuredSettlementsMember2021-12-310000896159cb:ReinsuranceOtherCaptivesMember2021-12-310000896159cb:ReinsuranceOtherMember2021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMember2019-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2019-12-310000896159cb:SegmentInsuranceNorthAmericanAgricultureMember2019-12-310000896159cb:SegmentInsuranceOverseasGeneralMember2019-12-310000896159cb:SegmentGlobalReinsuranceMember2019-12-310000896159cb:SegmentLifeMember2019-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:BanchileSegurosdeVidaMember2020-01-012020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:BanchileSegurosdeVidaMember2020-01-012020-12-310000896159cb:BanchileSegurosdeVidaMembercb:SegmentInsuranceNorthAmericanAgricultureMember2020-01-012020-12-310000896159cb:BanchileSegurosdeVidaMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:SegmentGlobalReinsuranceMembercb:BanchileSegurosdeVidaMember2020-01-012020-12-310000896159cb:BanchileSegurosdeVidaMembercb:SegmentLifeMember2020-01-012020-12-310000896159cb:BanchileSegurosdeVidaMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMember2020-01-012020-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2020-01-012020-12-310000896159cb:SegmentInsuranceNorthAmericanAgricultureMember2020-01-012020-12-310000896159cb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:SegmentGlobalReinsuranceMember2020-01-012020-12-310000896159cb:SegmentLifeMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMember2020-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2020-12-310000896159cb:SegmentInsuranceNorthAmericanAgricultureMember2020-12-310000896159cb:SegmentInsuranceOverseasGeneralMember2020-12-310000896159cb:SegmentGlobalReinsuranceMember2020-12-310000896159cb:SegmentLifeMember2020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMember2021-01-012021-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2021-01-012021-12-310000896159cb:SegmentInsuranceNorthAmericanAgricultureMember2021-01-012021-12-310000896159cb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:SegmentGlobalReinsuranceMember2021-01-012021-12-310000896159cb:SegmentLifeMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMember2021-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2021-12-310000896159cb:SegmentInsuranceNorthAmericanAgricultureMember2021-12-310000896159cb:SegmentInsuranceOverseasGeneralMember2021-12-310000896159cb:SegmentGlobalReinsuranceMember2021-12-310000896159cb:SegmentLifeMember2021-12-310000896159cb:AgencydistributionrelationshipsandrenewalrightsMembercb:TheChubbCorporationMember2021-12-310000896159cb:TheChubbCorporationMember2021-12-310000896159us-gaap:OtherIntangibleAssetsMember2021-12-310000896159cb:NorthAmericaWorkersCompensationMember2021-12-310000896159cb:NorthAmericaGeneralLiabilityMember2021-12-310000896159cb:NorthAmericaOtherCasualtyMember2021-12-310000896159cb:NorthAmericaNonCasualtyMember2021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMember2021-12-310000896159cb:OverseasGeneralCasualtyMember2021-12-310000896159cb:OverseasGeneralNonCasualtyMember2021-12-310000896159cb:GlobalReinsuranceCasualtyMember2021-12-310000896159cb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159us-gaap:AllOtherSegmentsMember2021-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2012-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2013-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2014-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2015-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2016-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2017-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2018-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2019-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2020-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaWorkersCompensationMember2013-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaWorkersCompensationMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaWorkersCompensationMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaWorkersCompensationMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaWorkersCompensationMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaWorkersCompensationMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaWorkersCompensationMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaWorkersCompensationMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaWorkersCompensationMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaWorkersCompensationMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaWorkersCompensationMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaWorkersCompensationMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaWorkersCompensationMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaWorkersCompensationMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaWorkersCompensationMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaWorkersCompensationMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaWorkersCompensationMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaWorkersCompensationMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaWorkersCompensationMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaWorkersCompensationMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaWorkersCompensationMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2016-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2017-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2018-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2019-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2020-12-310000896159cb:NorthAmericaWorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaWorkersCompensationMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaWorkersCompensationMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaWorkersCompensationMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaWorkersCompensationMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaWorkersCompensationMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaWorkersCompensationMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaWorkersCompensationMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaWorkersCompensationMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaWorkersCompensationMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaWorkersCompensationMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159cb:PriorTo2012Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159cb:A20122021Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159cb:PriorTo2012Membercb:NorthAmericaWorkersCompensationMember2021-01-012021-12-310000896159cb:A20122021Membercb:NorthAmericaWorkersCompensationMember2021-01-012021-12-310000896159cb:NorthAmericaWorkersCompensationMember2021-01-012021-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2012-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2013-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2014-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2015-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2016-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2017-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2018-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2019-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2020-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2021-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2013-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2014-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2015-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2016-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2017-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2018-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2019-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2020-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaGeneralLiabilityMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaGeneralLiabilityMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaGeneralLiabilityMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaGeneralLiabilityMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaGeneralLiabilityMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaGeneralLiabilityMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaGeneralLiabilityMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaGeneralLiabilityMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaGeneralLiabilityMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaGeneralLiabilityMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaGeneralLiabilityMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaGeneralLiabilityMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaGeneralLiabilityMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2016-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2017-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2018-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2019-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2020-12-310000896159cb:NorthAmericaGeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaGeneralLiabilityMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaGeneralLiabilityMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaGeneralLiabilityMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaGeneralLiabilityMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaGeneralLiabilityMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaGeneralLiabilityMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaGeneralLiabilityMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaGeneralLiabilityMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaGeneralLiabilityMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaGeneralLiabilityMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159cb:PriorTo2012Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159cb:A20122021Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159cb:PriorTo2012Membercb:NorthAmericaGeneralLiabilityMember2021-01-012021-12-310000896159cb:A20122021Membercb:NorthAmericaGeneralLiabilityMember2021-01-012021-12-310000896159cb:NorthAmericaGeneralLiabilityMember2021-01-012021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membercb:NorthAmericaOtherCasualtyMember2012-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membercb:NorthAmericaOtherCasualtyMember2013-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membercb:NorthAmericaOtherCasualtyMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membercb:NorthAmericaOtherCasualtyMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membercb:NorthAmericaOtherCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membercb:NorthAmericaOtherCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membercb:NorthAmericaOtherCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membercb:NorthAmericaOtherCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membercb:NorthAmericaOtherCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaOtherCasualtyMember2013-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaOtherCasualtyMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaOtherCasualtyMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaOtherCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaOtherCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaOtherCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaOtherCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaOtherCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaOtherCasualtyMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaOtherCasualtyMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaOtherCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaOtherCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaOtherCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaOtherCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaOtherCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaOtherCasualtyMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaOtherCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaOtherCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaOtherCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaOtherCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaOtherCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaOtherCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaOtherCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaOtherCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaOtherCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaOtherCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaOtherCasualtyMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaOtherCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaOtherCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaOtherCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaOtherCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaOtherCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaOtherCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaOtherCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaOtherCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaOtherCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159cb:PriorTo2012Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159cb:A20122021Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159cb:PriorTo2012Membercb:NorthAmericaOtherCasualtyMember2021-01-012021-12-310000896159cb:A20122021Membercb:NorthAmericaOtherCasualtyMember2021-01-012021-12-310000896159cb:NorthAmericaOtherCasualtyMember2021-01-012021-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2012-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2013-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2014-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2015-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2016-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2017-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2018-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2019-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2020-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaNonCasualtyMember2013-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaNonCasualtyMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaNonCasualtyMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaNonCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaNonCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaNonCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaNonCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaNonCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2013Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaNonCasualtyMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaNonCasualtyMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaNonCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaNonCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaNonCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaNonCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaNonCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaNonCasualtyMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaNonCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaNonCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaNonCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaNonCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaNonCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2016-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2017-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2018-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2019-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2020-12-310000896159cb:NorthAmericaNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaNonCasualtyMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaNonCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaNonCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159cb:PriorTo2012Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159cb:A20122021Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159cb:PriorTo2012Membercb:NorthAmericaNonCasualtyMember2021-01-012021-12-310000896159cb:A20122021Membercb:NorthAmericaNonCasualtyMember2021-01-012021-12-310000896159cb:NorthAmericaNonCasualtyMember2021-01-012021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2012-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2013-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2014-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2015-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2016-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2017-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2018-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2019-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2013-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2014-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2015-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2016-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2017-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2018-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2019-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaPersonalPCInsuranceMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaPersonalPCInsuranceMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaPersonalPCInsuranceMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaPersonalPCInsuranceMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaPersonalPCInsuranceMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaPersonalPCInsuranceMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaPersonalPCInsuranceMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:NorthAmericaPersonalPCInsuranceMember2021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2015-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2016-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2017-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2018-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2019-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2016-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2017-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2018-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2019-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2018-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2019-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2019-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2021Member2021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:PriorTo2012Member2021-12-310000896159cb:A20122021Membercb:NorthAmericaPersonalPCInsuranceMember2021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:PriorTo2012Member2021-01-012021-12-310000896159cb:A20122021Membercb:NorthAmericaPersonalPCInsuranceMember2021-01-012021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMember2021-01-012021-12-310000896159cb:OverseasGeneralCasualtyMembersrt:EuropeMember2021-01-012021-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2012-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2013-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2014-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2015-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2016-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2017-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2018-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2019-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2020-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2021-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2013-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2014-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2015-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2016-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2017-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2018-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2019-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2020-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralCasualtyMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralCasualtyMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralCasualtyMember2021-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2015-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2016-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2017-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2018-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2019-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2020-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2021-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2016-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2017-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2018-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2019-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2020-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2021-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2018-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2019-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2020-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2021-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2019-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2020-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2021-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2020-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2021-12-310000896159cb:OverseasGeneralCasualtyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2021Member2021-12-310000896159cb:OverseasGeneralCasualtyMembercb:PriorTo2012Member2021-12-310000896159cb:A20122021Membercb:OverseasGeneralCasualtyMember2021-12-310000896159cb:OverseasGeneralCasualtyMembercb:PriorTo2012Member2021-01-012021-12-310000896159cb:A20122021Membercb:OverseasGeneralCasualtyMember2021-01-012021-12-310000896159cb:OverseasGeneralCasualtyMember2021-01-012021-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2012-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2013-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2014-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2015-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2016-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2017-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2018-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2019-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2020-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2021-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2013-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2014-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2015-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2016-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2017-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2018-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2019-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2020-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralNonCasualtyMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralNonCasualtyMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralNonCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralNonCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralNonCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralNonCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralNonCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:OverseasGeneralNonCasualtyMember2021-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2015-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2016-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2017-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2018-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2019-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2020-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2021-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2016-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2017-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2018-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2019-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2020-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2021-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2018-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2019-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2020-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralNonCasualtyMember2021-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2020-12-310000896159cb:OverseasGeneralNonCasualtyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:OverseasGeneralNonCasualtyMember2021-12-310000896159cb:OverseasGeneralNonCasualtyMembercb:PriorTo2012Member2021-12-310000896159cb:A20122021Membercb:OverseasGeneralNonCasualtyMember2021-12-310000896159cb:OverseasGeneralNonCasualtyMembercb:PriorTo2012Member2021-01-012021-12-310000896159cb:A20122021Membercb:OverseasGeneralNonCasualtyMember2021-01-012021-12-310000896159cb:OverseasGeneralNonCasualtyMember2021-01-012021-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2012-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2013-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2014-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2015-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2016-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2017-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2018-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2019-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2020-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2021-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2013-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2014-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2015-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2016-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2017-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2018-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2019-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2020-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceCasualtyMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceCasualtyMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceCasualtyMember2021-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2015-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2016-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2017-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2018-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2019-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2020-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2021-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2016-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2017-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2018-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2019-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2020-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2021-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2018-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2019-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2020-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceCasualtyMember2021-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2020-12-310000896159cb:GlobalReinsuranceCasualtyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:GlobalReinsuranceCasualtyMember2021-12-310000896159cb:GlobalReinsuranceCasualtyMembercb:PriorTo2012Member2021-12-310000896159cb:A20122021Membercb:GlobalReinsuranceCasualtyMember2021-12-310000896159cb:GlobalReinsuranceCasualtyMembercb:PriorTo2012Member2021-01-012021-12-310000896159cb:A20122021Membercb:GlobalReinsuranceCasualtyMember2021-01-012021-12-310000896159cb:GlobalReinsuranceCasualtyMember2021-01-012021-12-310000896159cb:AccidentYear2012AndAfterMembercb:GlobalReinsuranceNonCasualtyMember2021-01-012021-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2021-01-012021-12-310000896159cb:GlobalReinsuranceNonCasualtyMembercb:AccidentYear2013To2021Member2021-01-012021-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2012-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2013-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2014-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2015-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2016-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2017-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2018-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2019-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2020-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Member2021-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2013-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2014-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2015-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2016-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2017-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2018-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2019-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2020-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceNonCasualtyMember2014-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceNonCasualtyMember2015-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceNonCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceNonCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceNonCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceNonCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceNonCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2014Membercb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2015-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2016-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2017-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2018-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2019-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2020-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2015Member2021-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2016-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2017-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2018-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2019-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2020-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2018-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2019-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2020-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2020-12-310000896159cb:GlobalReinsuranceNonCasualtyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159cb:PriorTo2012Membercb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159cb:A20122021Membercb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159cb:PriorTo2012Membercb:GlobalReinsuranceNonCasualtyMember2021-01-012021-12-310000896159cb:A20122021Membercb:GlobalReinsuranceNonCasualtyMember2021-01-012021-12-310000896159cb:GlobalReinsuranceNonCasualtyMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:A20122020Membercb:LongTailMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:PriorTo2012Membercb:LongTailMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:LongTailMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:ShortTailMembercb:A20122020Member2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:PriorTo2012Membercb:ShortTailMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:ShortTailMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:A20122020Member2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:PriorTo2012Member2021-01-012021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:ShortTailMembercb:A20122020Member2021-01-012021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:PriorTo2012Membercb:ShortTailMember2021-01-012021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:ShortTailMember2021-01-012021-12-310000896159cb:A20122020Membercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:PriorTo2012Membercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:ShortTailMembercb:A20122020Membercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:PriorTo2012Membercb:ShortTailMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:ShortTailMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:A20122020Membercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:PriorTo2012Membercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:SegmentGlobalReinsuranceMembercb:A20122020Membercb:LongTailMember2021-01-012021-12-310000896159cb:PriorTo2012Membercb:SegmentGlobalReinsuranceMembercb:LongTailMember2021-01-012021-12-310000896159cb:SegmentGlobalReinsuranceMembercb:LongTailMember2021-01-012021-12-310000896159cb:ShortTailMembercb:SegmentGlobalReinsuranceMembercb:A20122020Member2021-01-012021-12-310000896159cb:PriorTo2012Membercb:ShortTailMembercb:SegmentGlobalReinsuranceMember2021-01-012021-12-310000896159cb:ShortTailMembercb:SegmentGlobalReinsuranceMember2021-01-012021-12-310000896159cb:SegmentGlobalReinsuranceMembercb:A20122020Member2021-01-012021-12-310000896159cb:PriorTo2012Membercb:SegmentGlobalReinsuranceMember2021-01-012021-12-310000896159cb:SegmentsincludedinlosstrianglesDomaincb:A20122020Member2021-01-012021-12-310000896159cb:SegmentsincludedinlosstrianglesDomaincb:PriorTo2012Member2021-01-012021-12-310000896159cb:SegmentsincludedinlosstrianglesDomain2021-01-012021-12-310000896159cb:ShortTailMembercb:SegmentInsuranceNorthAmericanAgricultureMember2021-01-012021-12-310000896159us-gaap:CorporateMembercb:LongTailMember2021-01-012021-12-310000896159us-gaap:CorporateMember2021-01-012021-12-310000896159cb:AlternativeRiskSolutionsMember2021-01-012021-12-310000896159cb:NorthAmericaWorkersCompensationMember2021-01-012021-12-310000896159cb:InternationalAHMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:LongTailMember2021-01-012021-12-310000896159cb:LongTailMembercb:SegmentInsuranceNorthAmericanAgricultureMember2021-01-012021-12-310000896159us-gaap:CorporateMembercb:ShortTailMember2021-01-012021-12-310000896159us-gaap:CorporateMember2021-12-310000896159cb:LongTailMember2021-01-012021-12-310000896159cb:ShortTailMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:LongTailMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:ShortTailMember2020-01-012020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:LongTailMember2020-01-012020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:ShortTailMember2020-01-012020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMember2020-01-012020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMember2020-12-310000896159cb:LongTailMembercb:SegmentInsuranceNorthAmericanAgricultureMember2020-01-012020-12-310000896159cb:ShortTailMembercb:SegmentInsuranceNorthAmericanAgricultureMember2020-01-012020-12-310000896159cb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:ShortTailMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:SegmentGlobalReinsuranceMembercb:LongTailMember2020-01-012020-12-310000896159cb:ShortTailMembercb:SegmentGlobalReinsuranceMember2020-01-012020-12-310000896159us-gaap:CorporateMembercb:LongTailMember2020-01-012020-12-310000896159us-gaap:CorporateMembercb:ShortTailMember2020-01-012020-12-310000896159us-gaap:CorporateMember2020-01-012020-12-310000896159us-gaap:CorporateMember2020-12-310000896159cb:LongTailMember2020-01-012020-12-310000896159cb:ShortTailMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:LongTailMember2019-01-012019-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:ShortTailMember2019-01-012019-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMember2019-01-012019-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:LongTailMember2019-01-012019-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:ShortTailMember2019-01-012019-12-310000896159cb:NorthAmericaPersonalPCInsuranceMember2019-01-012019-12-310000896159cb:NorthAmericaPersonalPCInsuranceMember2019-12-310000896159cb:LongTailMembercb:SegmentInsuranceNorthAmericanAgricultureMember2019-01-012019-12-310000896159cb:ShortTailMembercb:SegmentInsuranceNorthAmericanAgricultureMember2019-01-012019-12-310000896159cb:SegmentInsuranceNorthAmericanAgricultureMember2019-01-012019-12-310000896159cb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2019-01-012019-12-310000896159cb:ShortTailMembercb:SegmentInsuranceOverseasGeneralMember2019-01-012019-12-310000896159cb:SegmentInsuranceOverseasGeneralMember2019-01-012019-12-310000896159cb:SegmentGlobalReinsuranceMembercb:LongTailMember2019-01-012019-12-310000896159cb:ShortTailMembercb:SegmentGlobalReinsuranceMember2019-01-012019-12-310000896159cb:SegmentGlobalReinsuranceMember2019-01-012019-12-310000896159us-gaap:CorporateMembercb:LongTailMember2019-01-012019-12-310000896159us-gaap:CorporateMembercb:ShortTailMember2019-01-012019-12-310000896159us-gaap:CorporateMember2019-01-012019-12-310000896159us-gaap:CorporateMember2019-12-310000896159cb:LongTailMember2019-01-012019-12-310000896159cb:ShortTailMember2019-01-012019-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:COVID19Membercb:ManagementLiabilityMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:LongTailMembercb:ManagementLiabilityMember2021-01-012021-12-310000896159cb:COVID19Membercb:SegmentNorthAmericaCommercialPCInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:LongTailMembercb:ManagementLiabilityMember2021-01-012021-12-310000896159cb:Accidentyears2016andpriorMembercb:SegmentNorthAmericaCommercialPCInsuranceMemberus-gaap:WorkersCompensationInsuranceMembercb:LongTailMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMemberus-gaap:WorkersCompensationInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:LongTailMember2021-01-012021-12-310000896159cb:AccidentYears20162017And2020Membercb:SegmentNorthAmericaCommercialPCInsuranceMemberus-gaap:ProfessionalMalpracticeLiabilityMembercb:LongTailMember2021-01-012021-12-310000896159cb:MultiLineMembercb:SegmentNorthAmericaCommercialPCInsuranceMembercb:Accidentyears2017andpriorMembercb:LongTailMember2021-01-012021-12-310000896159cb:MultiLineMembercb:SegmentNorthAmericaCommercialPCInsuranceMembercb:LongTailMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:Accidentyears2017andpriorMembercb:LongTailMembercb:EnvironmentallinesMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:OtherMembercb:AccidentYears2004AndPriorMembercb:LongTailMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:CommercialExcessandUmbrellaMembercb:LongTailMembercb:AccidentYears20162019Member2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:AccidentYears2017And2018Membercb:LongTailMembercb:MedicalPortfoliosMember2021-01-012021-12-310000896159cb:AutoLiabilityMembercb:AccidentYear2017To2019Membercb:SegmentNorthAmericaCommercialPCInsuranceMembercb:LongTailMember2021-01-012021-12-310000896159cb:PropertyAndInlandMarineMembercb:SegmentNorthAmericaCommercialPCInsuranceMembercb:ShortTailMembercb:AccidentYears2019And2020Member2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:ShortTailMemberus-gaap:SuretySegmentMembercb:AccidentYears20182020Member2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:ShortTailMemberus-gaap:SuretySegmentMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:ShortTailMemberus-gaap:AccidentAndHealthInsuranceSegmentMembercb:AccidentYears20192020Member2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:ShortTailMembercb:FirstPartyCyberRiskMembercb:AccidentYears20182020Member2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMemberus-gaap:WorkersCompensationInsuranceMembercb:LongTailMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Memberus-gaap:WorkersCompensationInsuranceMembercb:LongTailMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:AccidentYear2015andpriorMembercb:LongTailMembercb:ManagementLiabilityMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:Accidentyears2014andpriorMembercb:CommercialExcessandUmbrellaMembercb:LongTailMember2020-01-012020-12-310000896159cb:Accidentyears2016andpriorMembercb:SegmentNorthAmericaCommercialPCInsuranceMemberus-gaap:ProfessionalMalpracticeLiabilityMembercb:LongTailMember2020-01-012020-12-310000896159cb:Accidentyears2016andpriorMembercb:SegmentNorthAmericaCommercialPCInsuranceMembercb:LongTailMembercb:EnvironmentallinesMember2020-01-012020-12-310000896159cb:MultiLineMembercb:Accidentyears2016andpriorMembercb:SegmentNorthAmericaCommercialPCInsuranceMembercb:LongTailMember2020-01-012020-12-310000896159cb:MultiLineMembercb:SegmentNorthAmericaCommercialPCInsuranceMembercb:LongTailMember2020-01-012020-12-310000896159cb:ForeignCasualtyLineMembercb:SegmentNorthAmericaCommercialPCInsuranceMembercb:LongTailMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Member2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:AccidentYears20172019Membercb:GeneralLiabilityCoveragesMembercb:LongTailMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:LongTailMembercb:MedicalPortfoliosMembercb:AccidentYears20162019Member2020-01-012020-12-310000896159cb:AutoLiabilityMembercb:SegmentNorthAmericaCommercialPCInsuranceMembercb:LongTailMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:Accidentyears20182019Membercb:ShortTailMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:ShortTailMemberus-gaap:SuretySegmentMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Member2020-01-012020-12-310000896159cb:PropertyAndInlandMarineMembercb:SegmentNorthAmericaCommercialPCInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:ShortTailMember2020-01-012020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:HomeownersAndValuablesMembercb:ShortTailMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2021-01-012021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:AutoLiabilityMembercb:ShortTailMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Member2021-01-012021-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:AccidentYear2017To2019Membercb:HomeownersAndValuablesMembercb:ShortTailMember2020-01-012020-12-310000896159cb:NorthAmericaPersonalPCInsuranceMembercb:ShortTailMembercb:PersonalExcessMember2020-01-012020-12-310000896159cb:COVID19Membercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:CasualtyLinesMembercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:CasualtyLinesMembercb:Accidentyears2017andpriorMembercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:CasualtyLinesMembercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMembercb:AccidentYears20182020Member2021-01-012021-12-310000896159cb:FinancialMembercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:COVID19Membercb:FinancialMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:FinancialMembercb:AccidentYears20112020Membercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:ShortTailMemberus-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentInsuranceOverseasGeneralMembercb:AccidentYears20192020Member2021-01-012021-12-310000896159cb:COVID19Membercb:ShortTailMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Memberus-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:ShortTailMembercb:ConsumerMembercb:SegmentInsuranceOverseasGeneralMembercb:AccidentYears20192020Member2021-01-012021-12-310000896159cb:ShortTailMemberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercb:SegmentInsuranceOverseasGeneralMembercb:AccidentYears20192020Member2021-01-012021-12-310000896159cb:ShortTailMembercb:MarineMembercb:SegmentInsuranceOverseasGeneralMembercb:AccidentYears20182020Member2021-01-012021-12-310000896159cb:CasualtyLinesMembercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:Accidentyears2016andpriorMembercb:CasualtyLinesMembercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:AccidentYear2017To2019Membercb:CasualtyLinesMembercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:Accidentyears20182019Membercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMembercb:PoliticalRiskMember2020-01-012020-12-310000896159cb:FinancialMembercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:FinancialMembercb:AccidentYear2015andpriorMembercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:FinancialMembercb:LongTailMembercb:AccidentYears20162019Membercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:ShortTailMembercb:AccidentYears2012Through2019Membercb:MarineMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:Accidentyears20182019Membercb:ShortTailMemberus-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:ShortTailMembercb:SegmentGlobalReinsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:PropertycatastropheMember2021-01-012021-12-310000896159us-gaap:CorporateMembercb:OtherMembercb:LongTailMember2021-01-012021-12-310000896159us-gaap:CorporateMembercb:AsbestosEnvironmentalMembercb:LongTailMember2021-01-012021-12-310000896159us-gaap:CorporateMemberus-gaap:SegmentDiscontinuedOperationsMember2021-01-012021-12-310000896159us-gaap:CorporateMembercb:OtherMembercb:OtherMember2021-01-012021-12-310000896159us-gaap:CorporateMembercb:OtherMembercb:LongTailMember2020-01-012020-12-310000896159us-gaap:CorporateMembercb:AsbestosEnvironmentalMembercb:LongTailMember2020-01-012020-12-310000896159us-gaap:CorporateMemberus-gaap:SegmentDiscontinuedOperationsMember2020-01-012020-12-310000896159us-gaap:CorporateMembercb:OtherMembercb:OtherMember2020-01-012020-12-310000896159cb:BoyScoutsOfAmericaAgreementInPrincipleMember2021-12-310000896159us-gaap:AsbestosIssueMember2018-12-310000896159us-gaap:EnvironmentalIssueMember2018-12-310000896159us-gaap:AsbestosIssueMember2019-01-012019-12-310000896159us-gaap:EnvironmentalIssueMember2019-01-012019-12-310000896159us-gaap:AsbestosIssueMember2019-12-310000896159us-gaap:EnvironmentalIssueMember2019-12-310000896159us-gaap:AsbestosIssueMember2020-01-012020-12-310000896159us-gaap:EnvironmentalIssueMember2020-01-012020-12-310000896159us-gaap:AsbestosIssueMember2020-12-310000896159us-gaap:EnvironmentalIssueMember2020-12-310000896159us-gaap:AsbestosIssueMember2021-01-012021-12-310000896159us-gaap:EnvironmentalIssueMember2021-01-012021-12-310000896159us-gaap:AsbestosIssueMember2021-12-310000896159us-gaap:EnvironmentalIssueMember2021-12-310000896159cb:BrandywineMember2021-12-310000896159cb:BrandywineMember2020-12-310000896159cb:WestchesterSpecialtyMember2021-12-310000896159cb:WestchesterSpecialtyMember2020-12-310000896159cb:TheChubbCorporationMember2021-12-310000896159cb:TheChubbCorporationMember2020-12-310000896159us-gaap:AllOtherSegmentsMember2020-12-310000896159cb:BrandywineRunoffMember2021-12-310000896159cb:BrandywineRunoffMember2020-12-310000896159cb:BrandywineRunoffMember2004-12-310000896159cb:BrandywineRunoffMember2021-01-012021-12-310000896159cb:WestchesterandBrandywineRunoffMember2021-12-310000896159cb:OverseasGeneralNonCasualtyMembercb:EuropeAndAsiaMember2021-01-012021-12-310000896159country:CH2019-01-012019-12-310000896159country:CH2020-01-012020-12-310000896159country:CH2021-01-012021-12-310000896159us-gaap:DomesticCountryMember2021-01-012021-12-310000896159us-gaap:DomesticCountryMember2020-01-012020-12-310000896159us-gaap:DomesticCountryMember2019-01-012019-12-310000896159us-gaap:ForeignCountryMember2021-01-012021-12-310000896159us-gaap:ForeignCountryMember2020-01-012020-12-310000896159us-gaap:ForeignCountryMember2019-01-012019-12-310000896159country:US2021-01-012021-12-310000896159country:GB2021-01-012021-12-310000896159country:BM2021-01-012021-12-310000896159us-gaap:DomesticCountryMember2021-12-310000896159us-gaap:ForeignCountryMember2021-12-310000896159us-gaap:EarliestTaxYearMembercountry:AU2021-01-012021-12-310000896159us-gaap:LatestTaxYearMembercountry:AU2021-01-012021-12-310000896159country:CAus-gaap:EarliestTaxYearMember2021-01-012021-12-310000896159country:CAus-gaap:LatestTaxYearMember2021-01-012021-12-310000896159us-gaap:EarliestTaxYearMembercountry:FR2021-01-012021-12-310000896159us-gaap:LatestTaxYearMembercountry:FR2021-01-012021-12-310000896159us-gaap:EarliestTaxYearMembercountry:DE2021-01-012021-12-310000896159us-gaap:LatestTaxYearMembercountry:DE2021-01-012021-12-310000896159country:ITus-gaap:EarliestTaxYearMember2021-01-012021-12-310000896159us-gaap:LatestTaxYearMembercountry:IT2021-01-012021-12-310000896159us-gaap:EarliestTaxYearMembercountry:MX2021-01-012021-12-310000896159us-gaap:LatestTaxYearMembercountry:MX2021-01-012021-12-310000896159us-gaap:EarliestTaxYearMembercountry:ES2021-01-012021-12-310000896159us-gaap:LatestTaxYearMembercountry:ES2021-01-012021-12-310000896159us-gaap:EarliestTaxYearMembercountry:CH2021-01-012021-12-310000896159us-gaap:LatestTaxYearMembercountry:CH2021-01-012021-12-310000896159us-gaap:EarliestTaxYearMembercountry:GB2021-01-012021-12-310000896159us-gaap:LatestTaxYearMembercountry:GB2021-01-012021-12-310000896159us-gaap:EarliestTaxYearMembercountry:US2021-01-012021-12-310000896159us-gaap:LatestTaxYearMembercountry:US2021-01-012021-12-310000896159us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseMember2021-12-310000896159us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseMember2020-12-310000896159cb:INASeniorNotesDueNovember2022Memberus-gaap:SeniorNotesMember2021-12-310000896159cb:INASeniorNotesDueNovember2022Memberus-gaap:SeniorNotesMember2020-12-310000896159cb:INASeniorNotesDueNovember2022Memberus-gaap:SeniorNotesMember2021-12-310000896159cb:INASeniorNotesDueNovember2022Memberus-gaap:SeniorNotesMember2020-12-310000896159cb:INASeniorNotesDueMarch2023Memberus-gaap:SeniorNotesMember2021-12-310000896159cb:INASeniorNotesDueMarch2023Memberus-gaap:SeniorNotesMember2020-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueMay2024Member2021-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueMay2024Member2020-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueDecember2024Member2021-12-31iso4217:EUR0000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueDecember2024Member2020-12-310000896159cb:INASeniorNotesDueMarch2025Memberus-gaap:SeniorNotesMember2021-12-310000896159cb:INASeniorNotesDueMarch2025Memberus-gaap:SeniorNotesMember2020-12-310000896159cb:INASeniorNotesDueMay2026Memberus-gaap:SeniorNotesMember2021-12-310000896159cb:INASeniorNotesDueMay2026Memberus-gaap:SeniorNotesMember2020-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueJune2027Member2021-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueJune2027Member2020-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueMarch2028Member2021-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueMarch2028Member2020-12-310000896159cb:INADebenturesDueAugust2029Memberus-gaap:UnsecuredDebtMember2021-12-310000896159cb:INADebenturesDueAugust2029Memberus-gaap:UnsecuredDebtMember2020-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueDecember2029Member2021-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueDecember2029Member2020-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueSeptember2030Member2021-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueSeptember2030Member2020-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueJune2031Member2021-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueJune2031Member2020-12-310000896159us-gaap:UnsecuredDebtMembercb:INADebenturesDueNovember2031Member2021-12-310000896159us-gaap:UnsecuredDebtMembercb:INADebenturesDueNovember2031Member2020-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueMay2036Member2021-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueMay2036Member2020-12-310000896159cb:INASeniorNotesDueMay2037Memberus-gaap:SeniorNotesMember2021-12-310000896159cb:INASeniorNotesDueMay2037Memberus-gaap:SeniorNotesMember2020-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueMarch2038Member2021-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueMarch2038Member2020-12-310000896159cb:INASeniorNotesDueMay2038Memberus-gaap:SeniorNotesMember2021-12-310000896159cb:INASeniorNotesDueMay2038Memberus-gaap:SeniorNotesMember2020-12-310000896159cb:INASeniorNotesDueMarch2043Memberus-gaap:SeniorNotesMember2021-12-310000896159cb:INASeniorNotesDueMarch2043Memberus-gaap:SeniorNotesMember2020-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueNovember2045Member2021-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueNovember2045Member2020-12-310000896159cb:INASeniorNotesDueDecember2051Memberus-gaap:SeniorNotesMember2021-12-310000896159cb:INASeniorNotesDueDecember2051Memberus-gaap:SeniorNotesMember2020-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueDecember2061Member2021-12-310000896159us-gaap:SeniorNotesMembercb:INASeniorNotesDueDecember2061Member2020-12-310000896159us-gaap:SeniorNotesMember2021-12-310000896159us-gaap:SeniorNotesMember2020-12-310000896159us-gaap:TrustPreferredSecuritiesSubjectToMandatoryRedemptionMembercb:AceInaCapitalSecuritiesDue2030Member2021-12-310000896159us-gaap:TrustPreferredSecuritiesSubjectToMandatoryRedemptionMembercb:AceInaCapitalSecuritiesDue2030Member2020-12-310000896159us-gaap:TrustPreferredSecuritiesSubjectToMandatoryRedemptionMembercb:AceInaCapitalSecuritiesDue2030Member2000-03-310000896159us-gaap:ForeignExchangeFutureMemberus-gaap:OtherAssetsMember2021-12-310000896159us-gaap:ForeignExchangeFutureMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2021-12-310000896159us-gaap:ForeignExchangeFutureMember2021-12-310000896159us-gaap:ForeignExchangeFutureMemberus-gaap:OtherAssetsMember2020-12-310000896159us-gaap:ForeignExchangeFutureMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2020-12-310000896159us-gaap:ForeignExchangeFutureMember2020-12-310000896159us-gaap:OtherAssetsMemberus-gaap:FutureMember2021-12-310000896159us-gaap:AccountsPayableAndAccruedLiabilitiesMemberus-gaap:FutureMember2021-12-310000896159us-gaap:FutureMember2021-12-310000896159us-gaap:OtherAssetsMemberus-gaap:FutureMember2020-12-310000896159us-gaap:AccountsPayableAndAccruedLiabilitiesMemberus-gaap:FutureMember2020-12-310000896159us-gaap:FutureMember2020-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:ConvertiblesAndBondsWithWarrantsAttachedMember2021-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2021-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMember2021-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:ConvertiblesAndBondsWithWarrantsAttachedMember2020-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2020-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMember2020-12-310000896159us-gaap:OtherAssetsMember2021-12-310000896159us-gaap:AccountsPayableAndAccruedLiabilitiesMember2021-12-310000896159us-gaap:OtherAssetsMember2020-12-310000896159us-gaap:AccountsPayableAndAccruedLiabilitiesMember2020-12-310000896159us-gaap:OtherAssetsMemberus-gaap:SingleStockFutureMember2021-12-310000896159us-gaap:AccountsPayableAndAccruedLiabilitiesMemberus-gaap:SingleStockFutureMember2021-12-310000896159us-gaap:SingleStockFutureMember2021-12-310000896159us-gaap:OtherAssetsMemberus-gaap:SingleStockFutureMember2020-12-310000896159us-gaap:AccountsPayableAndAccruedLiabilitiesMemberus-gaap:SingleStockFutureMember2020-12-310000896159us-gaap:SingleStockFutureMember2020-12-310000896159cb:OtherDerivativesMemberus-gaap:OtherAssetsMember2021-12-310000896159cb:OtherDerivativesMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2021-12-310000896159cb:OtherDerivativesMember2021-12-310000896159cb:OtherDerivativesMemberus-gaap:OtherAssetsMember2020-12-310000896159cb:OtherDerivativesMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2020-12-310000896159cb:OtherDerivativesMember2020-12-310000896159us-gaap:OtherAssetsMembercb:OtherDerivativesTotalMember2021-12-310000896159cb:OtherDerivativesTotalMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2021-12-310000896159cb:OtherDerivativesTotalMember2021-12-310000896159us-gaap:OtherAssetsMembercb:OtherDerivativesTotalMember2020-12-310000896159cb:OtherDerivativesTotalMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2020-12-310000896159cb:OtherDerivativesTotalMember2020-12-310000896159us-gaap:OtherAssetsMemberus-gaap:GuaranteedMinimumIncomeBenefitMember2021-12-310000896159cb:BalanceSheetLocationAccountsPayableFuturePolicyBenefitsMemberus-gaap:GuaranteedMinimumIncomeBenefitMember2021-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMember2021-12-310000896159us-gaap:OtherAssetsMemberus-gaap:GuaranteedMinimumIncomeBenefitMember2020-12-310000896159cb:BalanceSheetLocationAccountsPayableFuturePolicyBenefitsMemberus-gaap:GuaranteedMinimumIncomeBenefitMember2020-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMember2020-12-310000896159us-gaap:ForeignExchangeFutureMember2021-01-012021-12-310000896159us-gaap:ForeignExchangeFutureMember2020-01-012020-12-310000896159us-gaap:ForeignExchangeFutureMember2019-01-012019-12-310000896159us-gaap:InterestRateSwapMember2021-01-012021-12-310000896159us-gaap:InterestRateSwapMember2020-01-012020-12-310000896159us-gaap:InterestRateSwapMember2019-01-012019-12-310000896159cb:OtherFuturesContractsAndOptionsMember2021-01-012021-12-310000896159cb:OtherFuturesContractsAndOptionsMember2020-01-012020-12-310000896159cb:OtherFuturesContractsAndOptionsMember2019-01-012019-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMember2021-01-012021-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMember2020-01-012020-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMember2019-01-012019-12-310000896159cb:InvestmentAndEmbeddedDerivativeInstrumentsMember2021-01-012021-12-310000896159cb:InvestmentAndEmbeddedDerivativeInstrumentsMember2020-01-012020-12-310000896159cb:InvestmentAndEmbeddedDerivativeInstrumentsMember2019-01-012019-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMember2021-01-012021-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMember2020-01-012020-12-310000896159us-gaap:GuaranteedMinimumIncomeBenefitMember2019-01-012019-12-310000896159us-gaap:SingleStockFutureMember2021-01-012021-12-310000896159us-gaap:SingleStockFutureMember2020-01-012020-12-310000896159us-gaap:SingleStockFutureMember2019-01-012019-12-310000896159cb:OtherDerivativesMember2021-01-012021-12-310000896159cb:OtherDerivativesMember2020-01-012020-12-310000896159cb:OtherDerivativesMember2019-01-012019-12-310000896159cb:GuaranteedLivingBenefitAndOtherDerivativeInstrumentsMember2021-01-012021-12-310000896159cb:GuaranteedLivingBenefitAndOtherDerivativeInstrumentsMember2020-01-012020-12-310000896159cb:GuaranteedLivingBenefitAndOtherDerivativeInstrumentsMember2019-01-012019-12-310000896159us-gaap:MaturityOvernightMemberus-gaap:CashAndCashEquivalentsMember2021-12-310000896159us-gaap:MaturityOvernightMemberus-gaap:CashAndCashEquivalentsMember2020-12-310000896159us-gaap:MaturityOvernightMemberus-gaap:USTreasuryAndGovernmentMember2021-12-310000896159us-gaap:MaturityOvernightMemberus-gaap:USTreasuryAndGovernmentMember2020-12-310000896159us-gaap:MaturityOvernightMemberus-gaap:ForeignGovernmentDebtMember2021-12-310000896159us-gaap:MaturityOvernightMemberus-gaap:ForeignGovernmentDebtMember2020-12-310000896159us-gaap:MaturityOvernightMemberus-gaap:CorporateDebtSecuritiesMember2021-12-310000896159us-gaap:MaturityOvernightMemberus-gaap:CorporateDebtSecuritiesMember2020-12-310000896159us-gaap:MaturityOvernightMemberus-gaap:MortgageBackedSecuritiesMember2021-12-310000896159us-gaap:MaturityOvernightMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000896159us-gaap:MaturityOvernightMemberus-gaap:EquitySecuritiesMember2021-12-310000896159us-gaap:MaturityOvernightMemberus-gaap:EquitySecuritiesMember2020-12-310000896159us-gaap:Maturity30To90DaysMemberus-gaap:CashAndCashEquivalentsMember2021-12-310000896159us-gaap:MaturityOver90DaysMemberus-gaap:CashAndCashEquivalentsMember2021-12-310000896159us-gaap:CashAndCashEquivalentsMember2021-12-310000896159us-gaap:Maturity30To90DaysMemberus-gaap:CashAndCashEquivalentsMember2020-12-310000896159us-gaap:MaturityOver90DaysMemberus-gaap:CashAndCashEquivalentsMember2020-12-310000896159us-gaap:CashAndCashEquivalentsMember2020-12-310000896159us-gaap:Maturity30To90DaysMemberus-gaap:USTreasuryAndGovernmentMember2021-12-310000896159us-gaap:MaturityOver90DaysMemberus-gaap:USTreasuryAndGovernmentMember2021-12-310000896159us-gaap:Maturity30To90DaysMemberus-gaap:USTreasuryAndGovernmentMember2020-12-310000896159us-gaap:MaturityOver90DaysMemberus-gaap:USTreasuryAndGovernmentMember2020-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:Maturity30To90DaysMember2021-12-310000896159us-gaap:MaturityOver90DaysMemberus-gaap:MortgageBackedSecuritiesMember2021-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:Maturity30To90DaysMember2020-12-310000896159us-gaap:MaturityOver90DaysMemberus-gaap:MortgageBackedSecuritiesMember2020-12-310000896159us-gaap:Maturity30To90DaysMember2021-12-310000896159us-gaap:MaturityOver90DaysMember2021-12-310000896159us-gaap:Maturity30To90DaysMember2020-12-310000896159us-gaap:MaturityOver90DaysMember2020-12-310000896159us-gaap:RepurchaseAgreementsMember2021-12-310000896159us-gaap:RepurchaseAgreementsMember2020-12-310000896159cb:CommitmentToPurchaseUnderlyingPortfolioInvestmentMember2021-12-310000896159us-gaap:LetterOfCreditMember2021-12-3100008961592021-05-3100008961592020-05-3100008961592019-05-310000896159currency:CHF2021-01-012021-12-310000896159currency:USD2021-01-012021-12-310000896159currency:CHF2020-01-012020-12-310000896159currency:USD2020-01-012020-12-310000896159currency:CHF2019-01-012019-12-310000896159currency:USD2019-01-012019-12-310000896159us-gaap:SubsequentEventMember2022-01-012022-12-310000896159cb:GeneralPurposeMember2021-12-310000896159cb:IssuanceofDebt1Member2021-12-310000896159cb:EmployeeBenefitPlansMember2021-12-310000896159cb:A2019StockRepurchasePlanMember2018-12-010000896159cb:Nov2019StockRepurchasePlanMember2019-11-210000896159cb:Nov2020StockRepurchasePlanMember2020-11-190000896159cb:Nov2020StockRepurchasePlanMember2021-02-010000896159cb:July2021StockRepurchasePlanMember2021-07-190000896159cb:Nov2020StockRepurchasePlanMember2021-01-012021-12-310000896159cb:Nov2019StockRepurchasePlanMember2020-01-012020-12-310000896159cb:A2019StockRepurchasePlanMember2019-01-012019-12-310000896159cb:July2021StockRepurchasePlanMemberus-gaap:SubsequentEventMember2022-01-012022-02-230000896159us-gaap:PerformanceSharesMember2021-01-012021-12-310000896159us-gaap:RestrictedStockMember2021-01-012021-12-310000896159cb:ChubbLimited2016LongTermIncentivePlanAmendedAndRestatedMemberus-gaap:CommonStockMember2021-12-310000896159us-gaap:EmployeeStockMemberus-gaap:CommonStockMember2021-12-310000896159us-gaap:EmployeeStockOptionMember2021-01-012021-12-310000896159us-gaap:EmployeeStockOptionMember2020-01-012020-12-310000896159us-gaap:EmployeeStockOptionMember2019-01-012019-12-310000896159us-gaap:RestrictedStockMember2020-01-012020-12-310000896159us-gaap:RestrictedStockMember2019-01-012019-12-310000896159cb:ChubbLimited2016LongTermIncentivePlanAmendedAndRestatedMemberus-gaap:RestrictedStockMember2021-01-012021-12-310000896159us-gaap:RestrictedStockMember2018-12-310000896159us-gaap:PerformanceSharesMember2018-12-310000896159us-gaap:PerformanceSharesMember2019-01-012019-12-310000896159us-gaap:RestrictedStockMember2019-12-310000896159us-gaap:PerformanceSharesMember2019-12-310000896159us-gaap:PerformanceSharesMember2020-01-012020-12-310000896159us-gaap:RestrictedStockMember2020-12-310000896159us-gaap:PerformanceSharesMember2020-12-310000896159us-gaap:RestrictedStockMember2021-12-310000896159us-gaap:PerformanceSharesMember2021-12-310000896159cb:AceLimited2004LongTermIncentivePlanMemberus-gaap:RestrictedStockUnitsRSUMember2021-01-012021-12-310000896159srt:MinimumMembercb:LegacyChubbCorpMemberus-gaap:RestrictedStockUnitsRSUMember2021-01-012021-12-310000896159srt:MaximumMembercb:LegacyChubbCorpMemberus-gaap:RestrictedStockUnitsRSUMember2021-01-012021-12-310000896159us-gaap:RestrictedStockUnitsRSUMember2021-12-310000896159us-gaap:DefinedBenefitPostretirementHealthCoverageMembercountry:US2016-10-312016-10-310000896159us-gaap:DefinedBenefitPostretirementHealthCoverageMembercb:SubjecttoAmortizationMembercountry:US2016-10-312016-10-310000896159us-gaap:DefinedBenefitPostretirementHealthCoverageMembercountry:US2021-01-012021-12-310000896159us-gaap:DefinedBenefitPostretirementHealthCoverageMembercountry:US2020-01-012020-12-310000896159us-gaap:DefinedBenefitPostretirementHealthCoverageMembercountry:US2019-01-012019-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:US2019-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2019-12-310000896159us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310000896159us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:US2021-01-012021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:US2020-01-012020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2020-01-012020-12-310000896159us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-12-310000896159us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:US2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000896159us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-12-310000896159us-gaap:PensionPlansDefinedBenefitMember2021-12-310000896159us-gaap:PensionPlansDefinedBenefitMember2020-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:US2019-01-012019-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2019-01-012019-12-310000896159us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercb:LossesandlossexpensesMember2021-01-012021-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercb:LossesandlossexpensesMember2020-01-012020-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercb:LossesandlossexpensesMember2019-01-012019-12-310000896159cb:LossesandlossexpensesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-12-310000896159cb:LossesandlossexpensesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310000896159cb:LossesandlossexpensesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310000896159us-gaap:GeneralAndAdministrativeExpenseMemberus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-12-310000896159us-gaap:GeneralAndAdministrativeExpenseMemberus-gaap:PensionPlansDefinedBenefitMember2020-01-012020-12-310000896159us-gaap:GeneralAndAdministrativeExpenseMemberus-gaap:PensionPlansDefinedBenefitMember2019-01-012019-12-310000896159us-gaap:GeneralAndAdministrativeExpenseMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-12-310000896159us-gaap:GeneralAndAdministrativeExpenseMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310000896159us-gaap:GeneralAndAdministrativeExpenseMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310000896159us-gaap:PensionPlansDefinedBenefitMember2021-01-012021-12-310000896159us-gaap:PensionPlansDefinedBenefitMember2020-01-012020-12-310000896159us-gaap:PensionPlansDefinedBenefitMember2019-01-012019-12-310000896159cb:ServiceCostMemberus-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-12-310000896159cb:ServiceCostMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:UScb:InterestCostMember2021-01-012021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMembercb:InterestCostMember2021-01-012021-12-310000896159cb:InterestCostMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-12-310000896159cb:ServiceCostMemberus-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2020-01-012020-12-310000896159cb:ServiceCostMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:UScb:InterestCostMember2020-01-012020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMembercb:InterestCostMember2020-01-012020-12-310000896159cb:InterestCostMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310000896159cb:ServiceCostMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2019-01-012019-12-310000896159cb:ServiceCostMemberus-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2019-01-012019-12-310000896159cb:ServiceCostMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:UScb:InterestCostMember2019-01-012019-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMembercb:InterestCostMember2019-01-012019-12-310000896159cb:InterestCostMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310000896159us-gaap:DefinedBenefitPlanEquitySecuritiesMembersrt:MinimumMember2021-12-310000896159srt:MaximumMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2021-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membercountry:US2021-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMembercountry:US2021-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2021-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membercountry:US2021-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMembercountry:US2021-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membercountry:US2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2021-12-310000896159us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membercountry:USus-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000896159us-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membercountry:US2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2021-12-310000896159us-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2021-12-310000896159us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanDerivativeMembercountry:US2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMembercountry:US2021-12-310000896159us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMembercountry:USus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMembercountry:US2021-12-310000896159us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membercountry:US2021-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMembercountry:US2021-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2021-12-310000896159us-gaap:OtherInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMember2021-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:UScb:InvestmentFundsLimitedPartnershipsPartiallyOwnedInvestmentCompaniesFairValueMember2021-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMembercb:InvestmentFundsLimitedPartnershipsPartiallyOwnedInvestmentCompaniesFairValueMember2021-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membercountry:US2020-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membercountry:US2020-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membercountry:US2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000896159us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membercountry:USus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000896159us-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membercountry:US2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000896159us-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000896159us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membercountry:US2020-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ShortTermInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel3Member2020-12-310000896159us-gaap:OtherInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:OtherInvestmentsMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000896159us-gaap:PensionPlansDefinedBenefitMembercountry:UScb:InvestmentFundsLimitedPartnershipsPartiallyOwnedInvestmentCompaniesFairValueMember2020-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMembercb:InvestmentFundsLimitedPartnershipsPartiallyOwnedInvestmentCompaniesFairValueMember2020-12-310000896159cb:HuataiGroupMember2021-01-012021-12-310000896159cb:HuataiGroupMember2020-01-012020-12-310000896159cb:HuataiGroupMember2019-01-012019-12-310000896159cb:SegmentCorporateAndOtherMember2021-01-012021-12-310000896159us-gaap:MaterialReconcilingItemsMember2021-01-012021-12-310000896159cb:SegmentCorporateAndOtherMember2020-01-012020-12-310000896159us-gaap:MaterialReconcilingItemsMember2020-01-012020-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2019-01-012019-12-310000896159cb:SegmentLifeMember2019-01-012019-12-310000896159cb:SegmentCorporateAndOtherMember2019-01-012019-12-310000896159us-gaap:MaterialReconcilingItemsMember2019-01-012019-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:PropertyandothershorttailMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:PropertyandothershorttailMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:PropertyandothershorttailMember2019-01-012019-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:CasualtyandallotherMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:CasualtyandallotherMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMembercb:CasualtyandallotherMember2019-01-012019-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2021-01-012021-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2020-01-012020-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2019-01-012019-12-310000896159us-gaap:AutomobilesMembercb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2021-01-012021-12-310000896159us-gaap:AutomobilesMembercb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2020-01-012020-12-310000896159us-gaap:AutomobilesMembercb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2019-01-012019-12-310000896159cb:PersonalhomeownerMembercb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2021-01-012021-12-310000896159cb:PersonalhomeownerMembercb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2020-01-012020-12-310000896159cb:PersonalhomeownerMembercb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2019-01-012019-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2021-01-012021-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2020-01-012020-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:SegmentInsuranceNorthAmericanPersonalPCMemberMember2019-01-012019-12-310000896159cb:PropertyandothershorttailMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:PropertyandothershorttailMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:PropertyandothershorttailMembercb:SegmentInsuranceOverseasGeneralMember2019-01-012019-12-310000896159cb:CasualtyandallotherMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:CasualtyandallotherMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:CasualtyandallotherMembercb:SegmentInsuranceOverseasGeneralMember2019-01-012019-12-310000896159cb:PersonalLinesMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159cb:PersonalLinesMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159cb:PersonalLinesMembercb:SegmentInsuranceOverseasGeneralMember2019-01-012019-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentInsuranceOverseasGeneralMember2021-01-012021-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentInsuranceOverseasGeneralMember2020-01-012020-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentInsuranceOverseasGeneralMember2019-01-012019-12-310000896159cb:PropertyandothershorttailMembercb:SegmentGlobalReinsuranceMember2021-01-012021-12-310000896159cb:PropertyandothershorttailMembercb:SegmentGlobalReinsuranceMember2020-01-012020-12-310000896159cb:PropertyandothershorttailMembercb:SegmentGlobalReinsuranceMember2019-01-012019-12-310000896159cb:SegmentGlobalReinsuranceMembercb:PropertycatastropheMember2021-01-012021-12-310000896159cb:SegmentGlobalReinsuranceMembercb:PropertycatastropheMember2020-01-012020-12-310000896159cb:SegmentGlobalReinsuranceMembercb:PropertycatastropheMember2019-01-012019-12-310000896159cb:CasualtyandallotherMembercb:SegmentGlobalReinsuranceMember2021-01-012021-12-310000896159cb:CasualtyandallotherMembercb:SegmentGlobalReinsuranceMember2020-01-012020-12-310000896159cb:CasualtyandallotherMembercb:SegmentGlobalReinsuranceMember2019-01-012019-12-310000896159us-gaap:LifeInsuranceSegmentMembercb:SegmentLifeMember2021-01-012021-12-310000896159us-gaap:LifeInsuranceSegmentMembercb:SegmentLifeMember2020-01-012020-12-310000896159us-gaap:LifeInsuranceSegmentMembercb:SegmentLifeMember2019-01-012019-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentLifeMember2021-01-012021-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentLifeMember2020-01-012020-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentLifeMember2019-01-012019-12-310000896159srt:NorthAmericaMember2021-01-012021-12-310000896159srt:EuropeMember2021-01-012021-12-310000896159srt:AsiaPacificMember2021-01-012021-12-310000896159srt:LatinAmericaMember2021-01-012021-12-310000896159srt:NorthAmericaMember2020-01-012020-12-310000896159srt:EuropeMember2020-01-012020-12-310000896159srt:AsiaPacificMember2020-01-012020-12-310000896159srt:LatinAmericaMember2020-01-012020-12-310000896159srt:NorthAmericaMember2019-01-012019-12-310000896159srt:EuropeMember2019-01-012019-12-310000896159srt:AsiaPacificMember2019-01-012019-12-310000896159srt:LatinAmericaMember2019-01-012019-12-310000896159cb:StarrTechnicalRiskAgencyandAffiliatesMember2021-01-012021-12-310000896159cb:StarrTechnicalRiskAgencyandAffiliatesMember2020-01-012020-12-310000896159cb:StarrTechnicalRiskAgencyandAffiliatesMember2019-01-012019-12-310000896159cb:StarrTechnicalRiskAgencyandAffiliatesMember2021-12-310000896159cb:StarrTechnicalRiskAgencyandAffiliatesMember2020-12-310000896159cb:ABRReinsuranceCapitalHoldingsLtd.Member2021-12-310000896159cb:BlackRockIncMember2021-01-012021-12-310000896159cb:ABRReinsuranceCapitalHoldingsLtd.Member2021-01-012021-12-310000896159cb:ABRReinsuranceCapitalHoldingsLtd.Member2020-01-012020-12-310000896159cb:ABRReinsuranceCapitalHoldingsLtd.Member2019-01-012019-12-310000896159cb:ABRReinsuranceCapitalHoldingsLtd.Member2020-12-310000896159cb:PropertyAndCasualtySubsidiariesMember2021-12-310000896159cb:PropertyAndCasualtySubsidiariesMember2020-12-310000896159cb:LifeSubsidiariesMemberMember2021-12-310000896159cb:LifeSubsidiariesMemberMember2020-12-310000896159cb:PropertyAndCasualtySubsidiariesMember2021-01-012021-12-310000896159cb:PropertyAndCasualtySubsidiariesMember2020-01-012020-12-310000896159cb:PropertyAndCasualtySubsidiariesMember2019-01-012019-12-310000896159cb:LifeSubsidiariesMemberMember2021-01-012021-12-310000896159cb:LifeSubsidiariesMemberMember2020-01-012020-12-310000896159cb:LifeSubsidiariesMemberMember2019-01-012019-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:USTreasuryAndGovernmentMember2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:AvailableforsaleSecuritiesMember2021-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:AvailableforsaleSecuritiesMember2021-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:AvailableforsaleSecuritiesMember2021-12-310000896159us-gaap:AvailableforsaleSecuritiesMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000896159us-gaap:AvailableforsaleSecuritiesMember2021-12-310000896159us-gaap:HeldtomaturitySecuritiesMemberus-gaap:USTreasuryAndGovernmentMember2021-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:HeldtomaturitySecuritiesMember2021-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:HeldtomaturitySecuritiesMember2021-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:HeldtomaturitySecuritiesMember2021-12-310000896159us-gaap:HeldtomaturitySecuritiesMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2021-12-310000896159us-gaap:HeldtomaturitySecuritiesMember2021-12-310000896159us-gaap:IndustrialMiscellaneousAndAllOthersMember2021-12-310000896159us-gaap:ShortTermInvestmentsMember2021-12-310000896159us-gaap:OtherLongTermInvestmentsMember2021-12-310000896159cb:AllRelatedPartyMember2021-12-310000896159srt:ParentCompanyMember2021-12-310000896159srt:ParentCompanyMember2020-12-310000896159srt:ParentCompanyMember2021-01-012021-12-310000896159srt:ParentCompanyMember2020-01-012020-12-310000896159srt:ParentCompanyMember2019-01-012019-12-310000896159srt:ParentCompanyMember2019-12-310000896159srt:ParentCompanyMember2018-12-310000896159us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2021-01-012021-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMember2021-01-012021-12-310000896159us-gaap:LifeInsuranceSegmentMember2021-01-012021-12-310000896159us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2020-01-012020-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMember2020-01-012020-12-310000896159us-gaap:LifeInsuranceSegmentMember2020-01-012020-12-310000896159us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2019-01-012019-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMember2019-01-012019-12-310000896159us-gaap:LifeInsuranceSegmentMember2019-01-012019-12-31