false2025FY0000896159http://fasb.org/us-gaap/2025#RealizedInvestmentGainsLosseshttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#OtherComprehensiveIncomeLossBeforeTaxhttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#Revenueshttp://fasb.org/us-gaap/2025#OtherAssetshttp://fasb.org/us-gaap/2025#OtherAssetshttp://fasb.org/us-gaap/2025#AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrenthttp://fasb.org/us-gaap/2025#AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentiso4217:USDxbrli:sharesiso4217:CHFxbrli:sharesiso4217:USDxbrli:sharesxbrli:purecb:partnershipsiso4217:EURiso4217:CNYiso4217:CHFiso4217:BNDiso4217:VND00008961592025-01-012025-12-310000896159us-gaap:CommonClassAMember2025-01-012025-12-310000896159cb:INASeniorNotesDueJune2027Member2025-01-012025-12-310000896159cb:INASeniorNotesDueMarch2028Member2025-01-012025-12-310000896159cb:INASeniorNotesDueDecember2029Member2025-01-012025-12-310000896159cb:INASeniorNotesDueJune2031Member2025-01-012025-12-310000896159cb:INASeniorNotesDueMarch2038Member2025-01-012025-12-3100008961592025-06-3000008961592026-02-2000008961592025-12-3100008961592025-10-012025-12-3100008961592024-12-310000896159us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2025-12-310000896159us-gaap:VariableInterestEntityPrimaryBeneficiaryMember2024-12-3100008961592024-01-012024-12-3100008961592023-01-012023-12-310000896159us-gaap:CommonStockMember2024-12-310000896159us-gaap:CommonStockMember2023-12-310000896159us-gaap:CommonStockMember2022-12-310000896159us-gaap:CommonStockMember2025-01-012025-12-310000896159us-gaap:CommonStockMember2024-01-012024-12-310000896159us-gaap:CommonStockMember2023-01-012023-12-310000896159us-gaap:CommonStockMember2025-12-310000896159us-gaap:TreasuryStockCommonMember2024-12-310000896159us-gaap:TreasuryStockCommonMember2023-12-310000896159us-gaap:TreasuryStockCommonMember2022-12-310000896159us-gaap:TreasuryStockCommonMember2025-01-012025-12-310000896159us-gaap:TreasuryStockCommonMember2024-01-012024-12-310000896159us-gaap:TreasuryStockCommonMember2023-01-012023-12-310000896159us-gaap:TreasuryStockCommonMember2025-12-310000896159us-gaap:AdditionalPaidInCapitalMember2024-12-310000896159us-gaap:AdditionalPaidInCapitalMember2023-12-310000896159us-gaap:AdditionalPaidInCapitalMember2022-12-310000896159us-gaap:AdditionalPaidInCapitalMember2025-01-012025-12-310000896159us-gaap:AdditionalPaidInCapitalMember2024-01-012024-12-310000896159us-gaap:AdditionalPaidInCapitalMember2023-01-012023-12-310000896159us-gaap:AdditionalPaidInCapitalMember2025-12-310000896159us-gaap:RetainedEarningsMember2024-12-310000896159us-gaap:RetainedEarningsMember2023-12-310000896159us-gaap:RetainedEarningsMember2022-12-310000896159us-gaap:RetainedEarningsMember2025-01-012025-12-310000896159us-gaap:RetainedEarningsMember2024-01-012024-12-310000896159us-gaap:RetainedEarningsMember2023-01-012023-12-310000896159us-gaap:RetainedEarningsMember2025-12-310000896159us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-12-310000896159us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-12-310000896159us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-12-310000896159us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-01-012025-12-310000896159us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-01-012024-12-310000896159us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-01-012023-12-310000896159us-gaap:AccumulatedOtherComprehensiveIncomeMember2025-12-310000896159us-gaap:ParentMember2025-12-310000896159us-gaap:ParentMember2024-12-310000896159us-gaap:ParentMember2023-12-310000896159us-gaap:NoncontrollingInterestMember2024-12-310000896159us-gaap:NoncontrollingInterestMember2023-12-310000896159us-gaap:NoncontrollingInterestMember2022-12-310000896159us-gaap:NoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:NoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:NoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:NoncontrollingInterestMember2025-12-3100008961592023-12-3100008961592022-12-310000896159cb:HuataiGroupMember2025-12-310000896159cb:HuataiGroupMember2024-12-310000896159srt:MinimumMember2025-01-012025-12-310000896159srt:MaximumMember2025-01-012025-12-310000896159srt:MinimumMember2025-12-310000896159srt:MaximumMember2025-12-310000896159cb:TheChubbCorporationMembercb:FairValueAdjustmenttoAcquiredLossReservesMember2025-12-310000896159cb:TheChubbCorporationMembercb:FairValueAdjustmenttoAcquiredLossReservesMember2024-12-310000896159us-gaap:SoftwareDevelopmentMember2025-12-310000896159us-gaap:BuildingMember2025-12-310000896159srt:MinimumMemberus-gaap:SoftwareDevelopmentMember2025-12-310000896159srt:MaximumMemberus-gaap:SoftwareDevelopmentMember2025-12-310000896159srt:MaximumMemberus-gaap:BuildingMember2025-12-310000896159cb:LMGInsuranceThailandMember2025-03-032025-03-030000896159cb:LibertyInsuranceVietnamMember2025-03-032025-03-030000896159cb:LMGInsuranceThailandMember2025-04-012025-04-010000896159cb:LMGInsuranceThailandMember2025-04-010000896159cb:HealthyPawsMember2024-05-312024-05-310000896159cb:HealthyPawsMember2024-05-310000896159cb:HuataiGroupMember2023-07-012023-07-010000896159cb:HuataiGroupMember2023-06-300000896159cb:HuataiGroupMember2023-07-010000896159cb:HuataiGroupMember2023-10-012023-12-310000896159cb:HuataiGroupMember2024-01-012024-03-310000896159cb:HuataiGroupMember2025-04-012025-06-300000896159cb:HuataiGroupMember2023-07-012023-12-310000896159srt:ProFormaMembercb:HuataiGroupMember2024-01-012024-12-310000896159us-gaap:USTreasuryAndGovernmentMember2025-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMember2025-12-310000896159us-gaap:CorporateDebtSecuritiesMember2025-12-310000896159us-gaap:MortgageBackedSecuritiesMember2025-12-310000896159us-gaap:USTreasuryAndGovernmentMember2024-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMember2024-12-310000896159us-gaap:CorporateDebtSecuritiesMember2024-12-310000896159us-gaap:MortgageBackedSecuritiesMember2024-12-310000896159us-gaap:FixedMaturitiesMember2025-01-012025-12-310000896159us-gaap:FixedMaturitiesMember2024-01-012024-12-310000896159us-gaap:FixedMaturitiesMember2023-01-012023-12-310000896159us-gaap:OtherInvestmentsMember2025-01-012025-12-310000896159us-gaap:OtherInvestmentsMember2024-01-012024-12-310000896159us-gaap:OtherInvestmentsMember2023-01-012023-12-310000896159us-gaap:EquitySecuritiesMember2025-01-012025-12-310000896159us-gaap:EquitySecuritiesMember2024-01-012024-12-310000896159us-gaap:EquitySecuritiesMember2023-01-012023-12-310000896159cb:AlternativeInvestmentMember2025-01-012025-12-310000896159cb:AlternativeInvestmentMember2024-01-012024-12-310000896159cb:AlternativeInvestmentMember2023-01-012023-12-310000896159us-gaap:ForeignExchangeContractMember2025-01-012025-12-310000896159us-gaap:ForeignExchangeContractMember2024-01-012024-12-310000896159us-gaap:ForeignExchangeContractMember2023-01-012023-12-310000896159us-gaap:OtherContractMember2025-01-012025-12-310000896159us-gaap:OtherContractMember2024-01-012024-12-310000896159us-gaap:OtherContractMember2023-01-012023-12-310000896159cb:OtherIncludingNonQualifiedSeparateAccountAssetsMember2025-01-012025-12-310000896159cb:OtherIncludingNonQualifiedSeparateAccountAssetsMember2024-01-012024-12-310000896159cb:OtherIncludingNonQualifiedSeparateAccountAssetsMember2023-01-012023-12-310000896159us-gaap:AvailableforsaleSecuritiesMember2025-01-012025-12-310000896159us-gaap:AvailableforsaleSecuritiesMember2024-01-012024-12-310000896159us-gaap:AvailableforsaleSecuritiesMember2023-01-012023-12-310000896159us-gaap:HeldtomaturitySecuritiesMember2025-01-012025-12-310000896159us-gaap:HeldtomaturitySecuritiesMember2024-01-012024-12-310000896159us-gaap:HeldtomaturitySecuritiesMember2023-01-012023-12-310000896159cb:OtherInvestmentsFixedMaturitiesMember2025-01-012025-12-310000896159cb:OtherInvestmentsFixedMaturitiesMember2024-01-012024-12-310000896159cb:ReservedAlternativeInvestmentFundMember2025-01-012025-12-310000896159cb:ReservedAlternativeInvestmentFundMember2024-01-012024-12-310000896159cb:EquitySecuritiesPrivateEquitiesAndOtherInvestmentsMember2025-01-012025-12-310000896159cb:EquitySecuritiesPrivateEquitiesAndOtherInvestmentsMember2024-01-012024-12-310000896159cb:EquitySecuritiesPrivateEquitiesAndOtherInvestmentsMember2023-01-012023-12-310000896159cb:OtherAccountingMethodMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FixedMaturitiesMember2025-12-310000896159cb:OtherAccountingMethodMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FixedMaturitiesMember2024-12-310000896159cb:OtherAccountingMethodMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:LifeInsuranceSegmentMember2025-12-310000896159cb:OtherAccountingMethodMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:LifeInsuranceSegmentMember2024-12-310000896159cb:OtherAccountingMethodMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:PolicyLoansMember2025-12-310000896159cb:OtherAccountingMethodMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:PolicyLoansMember2024-12-310000896159cb:OtherAccountingMethodMemberus-gaap:EstimateOfFairValueFairValueDisclosureMembercb:OtherIncludingNonQualifiedSeparateAccountAssetsMember2025-12-310000896159cb:OtherAccountingMethodMemberus-gaap:EstimateOfFairValueFairValueDisclosureMembercb:OtherIncludingNonQualifiedSeparateAccountAssetsMember2024-12-310000896159us-gaap:EstimateOfFairValueFairValueDisclosureMember2025-12-310000896159us-gaap:EstimateOfFairValueFairValueDisclosureMember2024-12-310000896159cb:OtherInvestmentsFixedMaturitiesMember2025-12-310000896159cb:OtherInvestmentsFixedMaturitiesMember2024-12-310000896159cb:FixedMaturitiesFairValueOptionMember2025-12-310000896159cb:FixedMaturitiesFairValueOptionMember2024-12-310000896159srt:MinimumMembercb:FinancialMember2025-01-012025-12-310000896159srt:MinimumMembercb:FinancialMember2024-01-012024-12-310000896159srt:MaximumMembercb:FinancialMember2024-01-012024-12-310000896159srt:MaximumMembercb:FinancialMember2025-01-012025-12-310000896159cb:FinancialMember2025-12-310000896159cb:FinancialMember2024-12-310000896159srt:MinimumMemberus-gaap:RealEstateFundsMember2025-01-012025-12-310000896159srt:MinimumMemberus-gaap:RealEstateFundsMember2024-01-012024-12-310000896159srt:MaximumMemberus-gaap:RealEstateFundsMember2024-01-012024-12-310000896159srt:MaximumMemberus-gaap:RealEstateFundsMember2025-01-012025-12-310000896159us-gaap:RealEstateFundsMember2025-12-310000896159us-gaap:RealEstateFundsMember2024-12-310000896159srt:MinimumMembercb:DistressedAlternativeInvestmentsMember2024-01-012024-12-310000896159srt:MinimumMembercb:DistressedAlternativeInvestmentsMember2025-01-012025-12-310000896159srt:MaximumMembercb:DistressedAlternativeInvestmentsMember2024-01-012024-12-310000896159srt:MaximumMembercb:DistressedAlternativeInvestmentsMember2025-01-012025-12-310000896159cb:DistressedAlternativeInvestmentsMember2025-12-310000896159cb:DistressedAlternativeInvestmentsMember2024-12-310000896159srt:MinimumMembercb:PrivateCreditAlternativeInvestmentsMember2024-01-012024-12-310000896159srt:MinimumMembercb:PrivateCreditAlternativeInvestmentsMember2025-01-012025-12-310000896159srt:MaximumMembercb:PrivateCreditAlternativeInvestmentsMember2025-01-012025-12-310000896159srt:MaximumMembercb:PrivateCreditAlternativeInvestmentsMember2024-01-012024-12-310000896159cb:PrivateCreditAlternativeInvestmentsMember2025-12-310000896159cb:PrivateCreditAlternativeInvestmentsMember2024-12-310000896159srt:MinimumMemberus-gaap:PrivateEquityFundsMember2025-01-012025-12-310000896159srt:MinimumMemberus-gaap:PrivateEquityFundsMember2024-01-012024-12-310000896159srt:MaximumMemberus-gaap:PrivateEquityFundsMember2025-01-012025-12-310000896159srt:MaximumMemberus-gaap:PrivateEquityFundsMember2024-01-012024-12-310000896159us-gaap:PrivateEquityFundsMember2025-12-310000896159us-gaap:PrivateEquityFundsMember2024-12-310000896159srt:MinimumMembercb:VintageAlternativeInvestmentsMember2024-01-012024-12-310000896159srt:MinimumMembercb:VintageAlternativeInvestmentsMember2025-01-012025-12-310000896159srt:MaximumMembercb:VintageAlternativeInvestmentsMember2025-01-012025-12-310000896159srt:MaximumMembercb:VintageAlternativeInvestmentsMember2024-01-012024-12-310000896159cb:VintageAlternativeInvestmentsMember2025-12-310000896159cb:VintageAlternativeInvestmentsMember2024-12-310000896159cb:InvestmentFundsAlternativeInvestmentsMember2025-12-310000896159cb:InvestmentFundsAlternativeInvestmentsMember2024-12-310000896159us-gaap:ShortTermInvestmentsMember2025-01-012025-12-310000896159us-gaap:ShortTermInvestmentsMember2024-01-012024-12-310000896159us-gaap:ShortTermInvestmentsMember2023-01-012023-12-310000896159cb:OtherinterestincomeMember2025-01-012025-12-310000896159cb:OtherinterestincomeMember2024-01-012024-12-310000896159cb:OtherinterestincomeMember2023-01-012023-12-310000896159us-gaap:AssetPledgedAsCollateralWithoutRightMember2025-12-310000896159us-gaap:AssetPledgedAsCollateralWithoutRightMember2024-12-310000896159cb:FixedMaturitiesTransferredToReservedAlternativeInvestmentFundMember2024-01-012024-12-310000896159cb:FixedMaturitiesTransferredToReservedAlternativeInvestmentFundMember2024-12-310000896159cb:FixedMaturitiesTransferredToReservedAlternativeInvestmentFundMember2024-01-012024-12-310000896159cb:ReservedAlternativeInvestmentFundMember2025-12-310000896159cb:ReservedAlternativeInvestmentFundMember2024-12-310000896159us-gaap:OtherInvestmentsMember2025-12-310000896159us-gaap:OtherInvestmentsMember2024-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2025-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2025-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2025-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2025-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2025-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2025-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2025-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2025-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2025-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2025-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2025-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2025-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2025-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2025-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2025-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2025-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2025-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2025-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2025-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2025-12-310000896159cb:ReservedAlternativeInvestmentFundMember2025-12-310000896159us-gaap:OtherInvestmentsMember2025-12-310000896159cb:InvestmentFundsLimitedPartnershipsPartiallyOwnedInvestmentCompaniesFairValueMember2025-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2024-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2024-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2024-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2024-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-12-310000896159us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel12And3Member2024-12-310000896159cb:ReservedAlternativeInvestmentFundMember2024-12-310000896159us-gaap:OtherInvestmentsMember2024-12-310000896159cb:InvestmentFundsLimitedPartnershipsPartiallyOwnedInvestmentCompaniesFairValueMember2024-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2024-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2024-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2024-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2024-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2024-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2025-01-012025-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2025-01-012025-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2025-01-012025-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2025-01-012025-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2025-01-012025-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2025-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2025-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2025-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2025-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2025-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2023-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2023-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2023-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2023-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2023-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2024-01-012024-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2024-01-012024-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2024-01-012024-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2024-01-012024-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2024-01-012024-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2022-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2022-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2022-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2022-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2022-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2023-01-012023-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2023-01-012023-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AvailableforsaleSecuritiesMember2023-01-012023-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel3Member2023-01-012023-12-310000896159us-gaap:ShortTermInvestmentsMemberus-gaap:FairValueInputsLevel3Member2023-01-012023-12-310000896159us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2025-12-310000896159us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2025-12-310000896159us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2025-12-310000896159us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel12And3Member2025-12-310000896159us-gaap:CarryingReportedAmountFairValueDisclosureMember2025-12-310000896159us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2024-12-310000896159us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel2Member2024-12-310000896159us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2024-12-310000896159us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel12And3Member2024-12-310000896159us-gaap:CarryingReportedAmountFairValueDisclosureMember2024-12-310000896159cb:ReinsuranceLargestReinsurersMember2025-12-310000896159cb:ReinsuranceOtherReinsurersBalancesRatedMinusOrBetterMember2025-12-310000896159cb:ReinsuranceOtherReinsurersBalancesWithRatingsLowerThanMinusOrNotRatedMember2025-12-310000896159cb:ReinsuranceOtherPoolsAndGovernmentAgenciesMember2025-12-310000896159cb:ReinsuranceStructuredSettlementsMember2025-12-310000896159cb:ReinsuranceOtherCaptivesMember2025-12-310000896159cb:ReinsuranceOtherMember2025-12-310000896159us-gaap:TermLifeInsuranceMembercb:SegmentLifeMember2024-12-310000896159us-gaap:UniversalLifeMembercb:SegmentLifeMember2024-12-310000896159us-gaap:WholeLifeInsuranceMembercb:SegmentLifeMember2024-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentLifeMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:SegmentLifeMember2024-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMembercb:SegmentLifeMember2024-12-310000896159us-gaap:TermLifeInsuranceMembercb:SegmentLifeMember2025-01-012025-12-310000896159us-gaap:UniversalLifeMembercb:SegmentLifeMember2025-01-012025-12-310000896159us-gaap:WholeLifeInsuranceMembercb:SegmentLifeMember2025-01-012025-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentLifeMember2025-01-012025-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:SegmentLifeMember2025-01-012025-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMembercb:SegmentLifeMember2025-01-012025-12-310000896159us-gaap:TermLifeInsuranceMembercb:SegmentLifeMember2025-12-310000896159us-gaap:UniversalLifeMembercb:SegmentLifeMember2025-12-310000896159us-gaap:WholeLifeInsuranceMembercb:SegmentLifeMember2025-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentLifeMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:SegmentLifeMember2025-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMembercb:SegmentLifeMember2025-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMembercb:SegmentInsuranceOverseasGeneralMember2025-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMember2025-12-310000896159us-gaap:OtherShortdurationInsuranceProductLineMember2025-12-310000896159us-gaap:TermLifeInsuranceMembercb:SegmentLifeMember2023-12-310000896159us-gaap:UniversalLifeMembercb:SegmentLifeMember2023-12-310000896159us-gaap:WholeLifeInsuranceMembercb:SegmentLifeMember2023-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentLifeMember2023-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:SegmentLifeMember2023-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMembercb:SegmentLifeMember2023-12-310000896159us-gaap:TermLifeInsuranceMembercb:SegmentLifeMember2024-01-012024-12-310000896159us-gaap:UniversalLifeMembercb:SegmentLifeMember2024-01-012024-12-310000896159us-gaap:WholeLifeInsuranceMembercb:SegmentLifeMember2024-01-012024-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentLifeMember2024-01-012024-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:SegmentLifeMember2024-01-012024-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMembercb:SegmentLifeMember2024-01-012024-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMembercb:SegmentInsuranceOverseasGeneralMember2024-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMember2024-12-310000896159us-gaap:OtherShortdurationInsuranceProductLineMember2024-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMember2023-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMember2023-12-310000896159cb:SegmentInsuranceNorthAmericanAgricultureMember2023-12-310000896159cb:SegmentInsuranceOverseasGeneralMember2023-12-310000896159cb:SegmentGlobalReinsuranceMember2023-12-310000896159cb:SegmentLifeMember2023-12-310000896159cb:HealthyPawsMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2024-01-012024-12-310000896159cb:HealthyPawsMembercb:SegmentInsuranceNorthAmericanPersonalPCMember2024-01-012024-12-310000896159cb:HealthyPawsMembercb:SegmentInsuranceNorthAmericanAgricultureMember2024-01-012024-12-310000896159cb:HealthyPawsMembercb:SegmentInsuranceOverseasGeneralMember2024-01-012024-12-310000896159cb:HealthyPawsMembercb:SegmentGlobalReinsuranceMember2024-01-012024-12-310000896159cb:HealthyPawsMembercb:SegmentLifeMember2024-01-012024-12-310000896159cb:HealthyPawsMember2024-01-012024-12-310000896159cb:HuataiGroupMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2024-01-012024-12-310000896159cb:HuataiGroupMembercb:SegmentInsuranceNorthAmericanPersonalPCMember2024-01-012024-12-310000896159cb:HuataiGroupMembercb:SegmentInsuranceNorthAmericanAgricultureMember2024-01-012024-12-310000896159cb:HuataiGroupMembercb:SegmentInsuranceOverseasGeneralMember2024-01-012024-12-310000896159cb:HuataiGroupMembercb:SegmentGlobalReinsuranceMember2024-01-012024-12-310000896159cb:HuataiGroupMembercb:SegmentLifeMember2024-01-012024-12-310000896159cb:HuataiGroupMember2024-01-012024-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMember2024-01-012024-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMember2024-01-012024-12-310000896159cb:SegmentInsuranceNorthAmericanAgricultureMember2024-01-012024-12-310000896159cb:SegmentInsuranceOverseasGeneralMember2024-01-012024-12-310000896159cb:SegmentGlobalReinsuranceMember2024-01-012024-12-310000896159cb:SegmentLifeMember2024-01-012024-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMember2024-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMember2024-12-310000896159cb:SegmentInsuranceNorthAmericanAgricultureMember2024-12-310000896159cb:SegmentInsuranceOverseasGeneralMember2024-12-310000896159cb:SegmentGlobalReinsuranceMember2024-12-310000896159cb:SegmentLifeMember2024-12-310000896159cb:LMGInsuranceThailandMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2025-01-012025-12-310000896159cb:LMGInsuranceThailandMembercb:SegmentInsuranceNorthAmericanPersonalPCMember2025-01-012025-12-310000896159cb:LMGInsuranceThailandMembercb:SegmentInsuranceNorthAmericanAgricultureMember2025-01-012025-12-310000896159cb:LMGInsuranceThailandMembercb:SegmentInsuranceOverseasGeneralMember2025-01-012025-12-310000896159cb:LMGInsuranceThailandMembercb:SegmentGlobalReinsuranceMember2025-01-012025-12-310000896159cb:LMGInsuranceThailandMembercb:SegmentLifeMember2025-01-012025-12-310000896159cb:LMGInsuranceThailandMember2025-01-012025-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMember2025-01-012025-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMember2025-01-012025-12-310000896159cb:SegmentInsuranceNorthAmericanAgricultureMember2025-01-012025-12-310000896159cb:SegmentInsuranceOverseasGeneralMember2025-01-012025-12-310000896159cb:SegmentGlobalReinsuranceMember2025-01-012025-12-310000896159cb:SegmentLifeMember2025-01-012025-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMember2025-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMember2025-12-310000896159cb:SegmentInsuranceNorthAmericanAgricultureMember2025-12-310000896159cb:SegmentInsuranceOverseasGeneralMember2025-12-310000896159cb:SegmentGlobalReinsuranceMember2025-12-310000896159cb:SegmentLifeMember2025-12-310000896159cb:HuataiGroupMember2025-01-012025-12-310000896159cb:HuataiGroupMember2023-01-012023-12-310000896159cb:ChubbAcquiredPurchasedIntangibleAssetsMember2025-12-310000896159cb:HuataiGroupMembercb:UnearnedPremiumReservesIntangibleAssetMember2025-12-310000896159cb:HuataiGroupMemberus-gaap:UseRightsMember2025-12-310000896159cb:HuataiGroupMember2025-12-310000896159cb:HuataiGroupMember2024-12-310000896159cb:HuataiGroupMember2023-12-310000896159cb:NorthAmericaWorkersCompensationMember2025-12-310000896159cb:NorthAmericaGeneralLiabilityMember2025-12-310000896159cb:NorthAmericaOtherCasualtyMember2025-12-310000896159cb:NorthAmericaNonCasualtyMember2025-12-310000896159cb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159cb:OverseasGeneralCasualtyMember2025-12-310000896159cb:OverseasGeneralNonCasualtyMember2025-12-310000896159cb:GlobalReinsuranceCasualtyMember2025-12-310000896159cb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159us-gaap:AllOtherSegmentsMember2025-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaWorkersCompensationMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaWorkersCompensationMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaWorkersCompensationMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaWorkersCompensationMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaWorkersCompensationMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaWorkersCompensationMember2022-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaWorkersCompensationMember2023-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaWorkersCompensationMember2024-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaWorkersCompensationMember2025-12-310000896159us-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:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaWorkersCompensationMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaWorkersCompensationMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaWorkersCompensationMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaWorkersCompensationMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaWorkersCompensationMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaWorkersCompensationMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaWorkersCompensationMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaWorkersCompensationMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaWorkersCompensationMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaWorkersCompensationMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaWorkersCompensationMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaWorkersCompensationMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaWorkersCompensationMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaWorkersCompensationMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaWorkersCompensationMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaWorkersCompensationMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaWorkersCompensationMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaWorkersCompensationMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaWorkersCompensationMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaWorkersCompensationMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaWorkersCompensationMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaWorkersCompensationMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaWorkersCompensationMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaWorkersCompensationMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaWorkersCompensationMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaWorkersCompensationMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaWorkersCompensationMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaWorkersCompensationMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaWorkersCompensationMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaWorkersCompensationMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaWorkersCompensationMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaWorkersCompensationMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaWorkersCompensationMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaWorkersCompensationMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:NorthAmericaWorkersCompensationMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:NorthAmericaWorkersCompensationMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2025Membercb:NorthAmericaWorkersCompensationMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:NorthAmericaWorkersCompensationMember2025-12-310000896159cb:AccidentYears20162025Membercb:NorthAmericaWorkersCompensationMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:NorthAmericaWorkersCompensationMember2025-01-012025-12-310000896159cb:AccidentYears20162025Membercb:NorthAmericaWorkersCompensationMember2025-01-012025-12-310000896159cb:NorthAmericaWorkersCompensationMember2025-01-012025-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaGeneralLiabilityMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaGeneralLiabilityMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaGeneralLiabilityMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaGeneralLiabilityMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaGeneralLiabilityMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaGeneralLiabilityMember2022-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaGeneralLiabilityMember2023-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaGeneralLiabilityMember2024-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaGeneralLiabilityMember2025-12-310000896159us-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:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaGeneralLiabilityMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaGeneralLiabilityMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaGeneralLiabilityMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaGeneralLiabilityMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaGeneralLiabilityMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaGeneralLiabilityMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaGeneralLiabilityMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaGeneralLiabilityMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaGeneralLiabilityMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaGeneralLiabilityMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaGeneralLiabilityMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaGeneralLiabilityMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaGeneralLiabilityMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaGeneralLiabilityMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaGeneralLiabilityMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaGeneralLiabilityMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaGeneralLiabilityMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaGeneralLiabilityMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaGeneralLiabilityMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaGeneralLiabilityMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaGeneralLiabilityMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaGeneralLiabilityMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaGeneralLiabilityMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaGeneralLiabilityMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaGeneralLiabilityMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaGeneralLiabilityMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaGeneralLiabilityMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaGeneralLiabilityMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaGeneralLiabilityMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaGeneralLiabilityMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaGeneralLiabilityMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaGeneralLiabilityMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaGeneralLiabilityMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaGeneralLiabilityMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:NorthAmericaGeneralLiabilityMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:NorthAmericaGeneralLiabilityMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2025Membercb:NorthAmericaGeneralLiabilityMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:NorthAmericaGeneralLiabilityMember2025-12-310000896159cb:AccidentYears20162025Membercb:NorthAmericaGeneralLiabilityMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:NorthAmericaGeneralLiabilityMember2025-01-012025-12-310000896159cb:AccidentYears20162025Membercb:NorthAmericaGeneralLiabilityMember2025-01-012025-12-310000896159cb:NorthAmericaGeneralLiabilityMember2025-01-012025-12-310000896159us-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:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaOtherCasualtyMember2022-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaOtherCasualtyMember2023-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaOtherCasualtyMember2024-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaOtherCasualtyMember2025-12-310000896159us-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:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaOtherCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaOtherCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaOtherCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaOtherCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaOtherCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaOtherCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaOtherCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaOtherCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaOtherCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaOtherCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaOtherCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaOtherCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaOtherCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaOtherCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaOtherCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaOtherCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaOtherCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaOtherCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaOtherCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaOtherCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaOtherCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaOtherCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaOtherCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaOtherCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaOtherCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaOtherCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaOtherCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaOtherCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaOtherCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaOtherCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaOtherCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaOtherCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaOtherCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaOtherCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:NorthAmericaOtherCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:NorthAmericaOtherCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2025Membercb:NorthAmericaOtherCasualtyMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:NorthAmericaOtherCasualtyMember2025-12-310000896159cb:AccidentYears20162025Membercb:NorthAmericaOtherCasualtyMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:NorthAmericaOtherCasualtyMember2025-01-012025-12-310000896159cb:AccidentYears20162025Membercb:NorthAmericaOtherCasualtyMember2025-01-012025-12-310000896159cb:NorthAmericaOtherCasualtyMember2025-01-012025-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaNonCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaNonCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaNonCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaNonCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaNonCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaNonCasualtyMember2022-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaNonCasualtyMember2023-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaNonCasualtyMember2024-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaNonCasualtyMember2025-12-310000896159us-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:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaNonCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:NorthAmericaNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:NorthAmericaNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2025Membercb:NorthAmericaNonCasualtyMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:NorthAmericaNonCasualtyMember2025-12-310000896159cb:AccidentYears20162025Membercb:NorthAmericaNonCasualtyMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:NorthAmericaNonCasualtyMember2025-01-012025-12-310000896159cb:AccidentYears20162025Membercb:NorthAmericaNonCasualtyMember2025-01-012025-12-310000896159cb:NorthAmericaNonCasualtyMember2025-01-012025-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaPersonalPCInsuranceMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaPersonalPCInsuranceMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaPersonalPCInsuranceMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaPersonalPCInsuranceMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaPersonalPCInsuranceMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaPersonalPCInsuranceMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaPersonalPCInsuranceMember2022-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaPersonalPCInsuranceMember2023-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaPersonalPCInsuranceMember2024-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaPersonalPCInsuranceMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaPersonalPCInsuranceMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaPersonalPCInsuranceMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaPersonalPCInsuranceMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaPersonalPCInsuranceMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaPersonalPCInsuranceMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaPersonalPCInsuranceMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaPersonalPCInsuranceMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaPersonalPCInsuranceMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaPersonalPCInsuranceMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaPersonalPCInsuranceMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaPersonalPCInsuranceMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaPersonalPCInsuranceMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaPersonalPCInsuranceMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaPersonalPCInsuranceMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaPersonalPCInsuranceMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaPersonalPCInsuranceMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaPersonalPCInsuranceMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaPersonalPCInsuranceMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaPersonalPCInsuranceMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaPersonalPCInsuranceMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaPersonalPCInsuranceMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaPersonalPCInsuranceMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaPersonalPCInsuranceMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaPersonalPCInsuranceMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaPersonalPCInsuranceMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaPersonalPCInsuranceMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:NorthAmericaPersonalPCInsuranceMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2025Membercb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159cb:AccidentYears20162025Membercb:NorthAmericaPersonalPCInsuranceMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:NorthAmericaPersonalPCInsuranceMember2025-01-012025-12-310000896159cb:AccidentYears20162025Membercb:NorthAmericaPersonalPCInsuranceMember2025-01-012025-12-310000896159cb:NorthAmericaPersonalPCInsuranceMember2025-01-012025-12-310000896159srt:EuropeMembercb:OverseasGeneralCasualtyMember2025-01-012025-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralCasualtyMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralCasualtyMember2022-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralCasualtyMember2023-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralCasualtyMember2024-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:OverseasGeneralCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:OverseasGeneralCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:OverseasGeneralCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:OverseasGeneralCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:OverseasGeneralCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:OverseasGeneralCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:OverseasGeneralCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:OverseasGeneralCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:OverseasGeneralCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:OverseasGeneralCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:OverseasGeneralCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:OverseasGeneralCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:OverseasGeneralCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:OverseasGeneralCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:OverseasGeneralCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:OverseasGeneralCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:OverseasGeneralCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:OverseasGeneralCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:OverseasGeneralCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:OverseasGeneralCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2025Membercb:OverseasGeneralCasualtyMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:OverseasGeneralCasualtyMember2025-12-310000896159cb:AccidentYears20162025Membercb:OverseasGeneralCasualtyMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:OverseasGeneralCasualtyMember2025-01-012025-12-310000896159cb:AccidentYears20162025Membercb:OverseasGeneralCasualtyMember2025-01-012025-12-310000896159cb:OverseasGeneralCasualtyMember2025-01-012025-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralNonCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralNonCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralNonCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralNonCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralNonCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralNonCasualtyMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralNonCasualtyMember2022-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralNonCasualtyMember2023-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralNonCasualtyMember2024-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:OverseasGeneralNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:OverseasGeneralNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralNonCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:OverseasGeneralNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:OverseasGeneralNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:OverseasGeneralNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:OverseasGeneralNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:OverseasGeneralNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:OverseasGeneralNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:OverseasGeneralNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:OverseasGeneralNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:OverseasGeneralNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:OverseasGeneralNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:OverseasGeneralNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:OverseasGeneralNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:OverseasGeneralNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:OverseasGeneralNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:OverseasGeneralNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:OverseasGeneralNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:OverseasGeneralNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:OverseasGeneralNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:OverseasGeneralNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:OverseasGeneralNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:OverseasGeneralNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:OverseasGeneralNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2025Membercb:OverseasGeneralNonCasualtyMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:OverseasGeneralNonCasualtyMember2025-12-310000896159cb:AccidentYears20162025Membercb:OverseasGeneralNonCasualtyMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:OverseasGeneralNonCasualtyMember2025-01-012025-12-310000896159cb:AccidentYears20162025Membercb:OverseasGeneralNonCasualtyMember2025-01-012025-12-310000896159cb:OverseasGeneralNonCasualtyMember2025-01-012025-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceCasualtyMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceCasualtyMember2022-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceCasualtyMember2023-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceCasualtyMember2024-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:GlobalReinsuranceCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:GlobalReinsuranceCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:GlobalReinsuranceCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:GlobalReinsuranceCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:GlobalReinsuranceCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:GlobalReinsuranceCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:GlobalReinsuranceCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:GlobalReinsuranceCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:GlobalReinsuranceCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:GlobalReinsuranceCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:GlobalReinsuranceCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:GlobalReinsuranceCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:GlobalReinsuranceCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:GlobalReinsuranceCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:GlobalReinsuranceCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:GlobalReinsuranceCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:GlobalReinsuranceCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:GlobalReinsuranceCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:GlobalReinsuranceCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:GlobalReinsuranceCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2025Membercb:GlobalReinsuranceCasualtyMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:GlobalReinsuranceCasualtyMember2025-12-310000896159cb:AccidentYears20162025Membercb:GlobalReinsuranceCasualtyMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:GlobalReinsuranceCasualtyMember2025-01-012025-12-310000896159cb:AccidentYears20162025Membercb:GlobalReinsuranceCasualtyMember2025-01-012025-12-310000896159cb:GlobalReinsuranceCasualtyMember2025-01-012025-12-310000896159cb:AccidentYear2016AndAfterMembercb:GlobalReinsuranceNonCasualtyMember2025-01-012025-12-310000896159cb:AccidentYears20162017Membercb:GlobalReinsuranceNonCasualtyMember2025-01-012025-12-310000896159cb:AccidentYear2018To2025Membercb:GlobalReinsuranceNonCasualtyMember2025-01-012025-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceNonCasualtyMember2016-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceNonCasualtyMember2017-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceNonCasualtyMember2018-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceNonCasualtyMember2019-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceNonCasualtyMember2020-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceNonCasualtyMember2022-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceNonCasualtyMember2023-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceNonCasualtyMember2024-12-310000896159us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membercb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2017-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membercb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceNonCasualtyMember2018-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membercb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceNonCasualtyMember2019-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2019Membercb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:GlobalReinsuranceNonCasualtyMember2020-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:GlobalReinsuranceNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:GlobalReinsuranceNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:GlobalReinsuranceNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2020Membercb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:GlobalReinsuranceNonCasualtyMember2021-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:GlobalReinsuranceNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:GlobalReinsuranceNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:GlobalReinsuranceNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2021Membercb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:GlobalReinsuranceNonCasualtyMember2022-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:GlobalReinsuranceNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:GlobalReinsuranceNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2022Membercb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:GlobalReinsuranceNonCasualtyMember2023-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:GlobalReinsuranceNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2023Membercb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:GlobalReinsuranceNonCasualtyMember2024-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2024Membercb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159us-gaap:ShortDurationInsuranceContractAccidentYear2025Membercb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159cb:AccidentYears20162025Membercb:GlobalReinsuranceNonCasualtyMember2025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:GlobalReinsuranceNonCasualtyMember2025-01-012025-12-310000896159cb:AccidentYears20162025Membercb:GlobalReinsuranceNonCasualtyMember2025-01-012025-12-310000896159cb:GlobalReinsuranceNonCasualtyMember2025-01-012025-12-310000896159cb:A20162024AccidentYearsMembercb:LongTailMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2025-01-012025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:LongTailMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2025-01-012025-12-310000896159cb:LongTailMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2025-01-012025-12-310000896159cb:A20162024AccidentYearsMembercb:ShortTailMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2025-01-012025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:ShortTailMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2025-01-012025-12-310000896159cb:ShortTailMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2025-01-012025-12-310000896159cb:A20162024AccidentYearsMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2025-01-012025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:SegmentNorthAmericaCommercialPCInsuranceMember2025-01-012025-12-310000896159cb:A20162024AccidentYearsMembercb:ShortTailMembercb:NorthAmericaPersonalPCInsuranceMember2025-01-012025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:ShortTailMembercb:NorthAmericaPersonalPCInsuranceMember2025-01-012025-12-310000896159cb:ShortTailMembercb:NorthAmericaPersonalPCInsuranceMember2025-01-012025-12-310000896159cb:A20162024AccidentYearsMembercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2025-01-012025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2025-01-012025-12-310000896159cb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2025-01-012025-12-310000896159cb:A20162024AccidentYearsMembercb:ShortTailMembercb:SegmentInsuranceOverseasGeneralMember2025-01-012025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:ShortTailMembercb:SegmentInsuranceOverseasGeneralMember2025-01-012025-12-310000896159cb:ShortTailMembercb:SegmentInsuranceOverseasGeneralMember2025-01-012025-12-310000896159cb:A20162024AccidentYearsMembercb:SegmentInsuranceOverseasGeneralMember2025-01-012025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:SegmentInsuranceOverseasGeneralMember2025-01-012025-12-310000896159cb:A20162024AccidentYearsMembercb:LongTailMembercb:SegmentGlobalReinsuranceMember2025-01-012025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:LongTailMembercb:SegmentGlobalReinsuranceMember2025-01-012025-12-310000896159cb:LongTailMembercb:SegmentGlobalReinsuranceMember2025-01-012025-12-310000896159cb:A20162024AccidentYearsMembercb:ShortTailMembercb:SegmentGlobalReinsuranceMember2025-01-012025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:ShortTailMembercb:SegmentGlobalReinsuranceMember2025-01-012025-12-310000896159cb:ShortTailMembercb:SegmentGlobalReinsuranceMember2025-01-012025-12-310000896159cb:A20162024AccidentYearsMembercb:SegmentGlobalReinsuranceMember2025-01-012025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:SegmentGlobalReinsuranceMember2025-01-012025-12-310000896159cb:A20162024AccidentYearsMembercb:SegmentsincludedinlosstrianglesDomain2025-01-012025-12-310000896159cb:AccidentYearsPriorTo2016Membercb:SegmentsincludedinlosstrianglesDomain2025-01-012025-12-310000896159cb:SegmentsincludedinlosstrianglesDomain2025-01-012025-12-310000896159cb:ShortTailMembercb:SegmentInsuranceNorthAmericanAgricultureMember2025-01-012025-12-310000896159cb:LongTailMemberus-gaap:CorporateMember2025-01-012025-12-310000896159cb:AlternativeRiskSolutionsMember2025-01-012025-12-310000896159cb:NorthAmericaWorkersCompensationMember2025-01-012025-12-310000896159cb:LongTailMembercb:NorthAmericaPersonalPCInsuranceMember2025-01-012025-12-310000896159cb:LongTailMembercb:SegmentInsuranceNorthAmericanAgricultureMember2025-01-012025-12-310000896159cb:ShortTailMemberus-gaap:CorporateMember2025-01-012025-12-310000896159us-gaap:CorporateMember2025-01-012025-12-310000896159us-gaap:CorporateMember2025-12-310000896159cb:LongTailMember2025-01-012025-12-310000896159cb:ShortTailMember2025-01-012025-12-310000896159cb:LongTailMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2024-01-012024-12-310000896159cb:ShortTailMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2024-01-012024-12-310000896159cb:LongTailMembercb:NorthAmericaPersonalPCInsuranceMember2024-01-012024-12-310000896159cb:ShortTailMembercb:NorthAmericaPersonalPCInsuranceMember2024-01-012024-12-310000896159cb:NorthAmericaPersonalPCInsuranceMember2024-01-012024-12-310000896159cb:NorthAmericaPersonalPCInsuranceMember2024-12-310000896159cb:LongTailMembercb:SegmentInsuranceNorthAmericanAgricultureMember2024-01-012024-12-310000896159cb:ShortTailMembercb:SegmentInsuranceNorthAmericanAgricultureMember2024-01-012024-12-310000896159cb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2024-01-012024-12-310000896159cb:ShortTailMembercb:SegmentInsuranceOverseasGeneralMember2024-01-012024-12-310000896159cb:LongTailMembercb:SegmentGlobalReinsuranceMember2024-01-012024-12-310000896159cb:ShortTailMembercb:SegmentGlobalReinsuranceMember2024-01-012024-12-310000896159cb:LongTailMemberus-gaap:CorporateMember2024-01-012024-12-310000896159cb:ShortTailMemberus-gaap:CorporateMember2024-01-012024-12-310000896159us-gaap:CorporateMember2024-01-012024-12-310000896159us-gaap:CorporateMember2024-12-310000896159cb:LongTailMember2024-01-012024-12-310000896159cb:ShortTailMember2024-01-012024-12-310000896159cb:LongTailMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2023-01-012023-12-310000896159cb:ShortTailMembercb:SegmentNorthAmericaCommercialPCInsuranceMember2023-01-012023-12-310000896159cb:SegmentNorthAmericaCommercialPCInsuranceMember2023-01-012023-12-310000896159cb:LongTailMembercb:NorthAmericaPersonalPCInsuranceMember2023-01-012023-12-310000896159cb:ShortTailMembercb:NorthAmericaPersonalPCInsuranceMember2023-01-012023-12-310000896159cb:NorthAmericaPersonalPCInsuranceMember2023-01-012023-12-310000896159cb:NorthAmericaPersonalPCInsuranceMember2023-12-310000896159cb:LongTailMembercb:SegmentInsuranceNorthAmericanAgricultureMember2023-01-012023-12-310000896159cb:ShortTailMembercb:SegmentInsuranceNorthAmericanAgricultureMember2023-01-012023-12-310000896159cb:SegmentInsuranceNorthAmericanAgricultureMember2023-01-012023-12-310000896159cb:LongTailMembercb:SegmentInsuranceOverseasGeneralMember2023-01-012023-12-310000896159cb:ShortTailMembercb:SegmentInsuranceOverseasGeneralMember2023-01-012023-12-310000896159cb:SegmentInsuranceOverseasGeneralMember2023-01-012023-12-310000896159cb:LongTailMembercb:SegmentGlobalReinsuranceMember2023-01-012023-12-310000896159cb:ShortTailMembercb:SegmentGlobalReinsuranceMember2023-01-012023-12-310000896159cb:SegmentGlobalReinsuranceMember2023-01-012023-12-310000896159cb:LongTailMemberus-gaap:CorporateMember2023-01-012023-12-310000896159cb:ShortTailMemberus-gaap:CorporateMember2023-01-012023-12-310000896159us-gaap:CorporateMember2023-01-012023-12-310000896159us-gaap:CorporateMember2023-12-310000896159cb:LongTailMember2023-01-012023-12-310000896159cb:ShortTailMember2023-01-012023-12-310000896159cb:BoyScoutsOfAmericaAgreementInPrincipleMember2023-12-310000896159cb:BoyScoutsOfAmericaAgreementInPrincipleMember2024-01-012024-12-310000896159cb:BoyScoutsOfAmericaAgreementInPrincipleMember2024-12-310000896159us-gaap:AsbestosIssueMember2022-12-310000896159us-gaap:EnvironmentalIssueMember2022-12-310000896159us-gaap:AsbestosIssueMember2023-01-012023-12-310000896159us-gaap:EnvironmentalIssueMember2023-01-012023-12-310000896159us-gaap:AsbestosIssueMember2023-12-310000896159us-gaap:EnvironmentalIssueMember2023-12-310000896159us-gaap:AsbestosIssueMember2024-01-012024-12-310000896159us-gaap:EnvironmentalIssueMember2024-01-012024-12-310000896159us-gaap:AsbestosIssueMember2024-12-310000896159us-gaap:EnvironmentalIssueMember2024-12-310000896159us-gaap:AsbestosIssueMember2025-01-012025-12-310000896159us-gaap:EnvironmentalIssueMember2025-01-012025-12-310000896159us-gaap:AsbestosIssueMember2025-12-310000896159us-gaap:EnvironmentalIssueMember2025-12-310000896159cb:BrandywineMember2025-12-310000896159cb:BrandywineMember2024-12-310000896159cb:WestchesterSpecialtyMember2025-12-310000896159cb:WestchesterSpecialtyMember2024-12-310000896159cb:TheChubbCorporationMember2025-12-310000896159cb:TheChubbCorporationMember2024-12-310000896159us-gaap:AllOtherSegmentsMember2024-12-310000896159cb:BrandywineRunoffMember2025-12-310000896159cb:BrandywineRunoffMember2024-12-310000896159cb:BrandywineRunoffMember2004-12-310000896159cb:BrandywineRunoffMember2025-01-012025-12-310000896159cb:WestchesterandBrandywineRunoffMember2025-12-310000896159us-gaap:TermLifeInsuranceMembercb:SegmentLifeMember2023-01-012023-12-310000896159us-gaap:WholeLifeInsuranceMembercb:SegmentLifeMember2023-01-012023-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMembercb:SegmentLifeMember2023-01-012023-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:SegmentLifeMember2023-01-012023-12-310000896159cb:SegmentLifeMember2023-01-012023-12-310000896159us-gaap:UniversalLifeMember2024-12-310000896159cb:AnnuitiesMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMember2024-12-310000896159us-gaap:UniversalLifeMember2025-01-012025-12-310000896159cb:AnnuitiesMember2025-01-012025-12-310000896159us-gaap:OtherInsuranceProductLineMember2025-01-012025-12-310000896159us-gaap:UniversalLifeMember2025-12-310000896159cb:AnnuitiesMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMember2025-12-310000896159us-gaap:UniversalLifeMember2023-12-310000896159cb:AnnuitiesMember2023-12-310000896159us-gaap:OtherInsuranceProductLineMember2023-12-310000896159us-gaap:UniversalLifeMember2024-01-012024-12-310000896159cb:AnnuitiesMember2024-01-012024-12-310000896159us-gaap:OtherInsuranceProductLineMember2024-01-012024-12-310000896159us-gaap:UniversalLifeMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Membersrt:MaximumMember2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2025-12-310000896159us-gaap:UniversalLifeMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2025-12-310000896159us-gaap:UniversalLifeMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Membersrt:MinimumMember2025-12-310000896159us-gaap:UniversalLifeMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Membersrt:MaximumMember2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2025-12-310000896159us-gaap:UniversalLifeMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMembersrt:MinimumMember2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Memberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Memberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2025-12-310000896159us-gaap:UniversalLifeMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateFixedRateOrNoGuaranteeMember2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Member2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Member2025-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMember2025-12-310000896159us-gaap:UniversalLifeMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Membersrt:MaximumMember2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2024-12-310000896159us-gaap:UniversalLifeMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2024-12-310000896159us-gaap:UniversalLifeMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Membersrt:MinimumMember2024-12-310000896159us-gaap:UniversalLifeMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Membersrt:MaximumMember2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2024-12-310000896159us-gaap:UniversalLifeMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMembersrt:MinimumMember2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Memberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Memberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2024-12-310000896159us-gaap:UniversalLifeMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateFixedRateOrNoGuaranteeMember2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Member2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Member2024-12-310000896159us-gaap:UniversalLifeMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Membersrt:MaximumMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2025-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2025-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Membersrt:MinimumMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Membersrt:MaximumMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2025-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMembersrt:MinimumMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Memberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Memberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateFixedRateOrNoGuaranteeMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Member2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Member2025-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMember2025-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Membersrt:MaximumMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2024-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeUpTo0200Member2024-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Membersrt:MinimumMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Membersrt:MaximumMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Membercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2024-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditRatingRangeFrom0201To0400Member2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMembersrt:MinimumMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Memberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Memberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400AndGreaterMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMembercb:PolicyholderAccountBalanceGuaranteedMinimumCreditingRateFixedRateOrNoGuaranteeMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Member2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Member2024-12-310000896159us-gaap:OtherInsuranceProductLineMemberus-gaap:PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0151AndGreaterMember2024-12-310000896159us-gaap:SeparateAccountCashAndCashEquivalentsMember2025-12-310000896159us-gaap:SeparateAccountCashAndCashEquivalentsMember2024-12-310000896159us-gaap:SeparateAccountEquitySecurityMember2025-12-310000896159us-gaap:SeparateAccountEquitySecurityMember2024-12-310000896159us-gaap:SeparateAccountDebtSecurityMember2025-12-310000896159us-gaap:SeparateAccountDebtSecurityMember2024-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMemberus-gaap:VariableAnnuityMember2024-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMemberus-gaap:VariableAnnuityMember2023-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMemberus-gaap:VariableAnnuityMember2025-01-012025-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMemberus-gaap:VariableAnnuityMember2024-01-012024-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMemberus-gaap:VariableAnnuityMember2025-12-310000896159us-gaap:OtherLongdurationInsuranceProductLineMemberus-gaap:VariableAnnuityMember2025-07-012025-09-300000896159srt:WeightedAverageMember2025-12-310000896159srt:MinimumMember2024-12-310000896159srt:MaximumMember2024-12-310000896159srt:WeightedAverageMember2024-12-310000896159us-gaap:DomesticCountryMember2025-01-012025-12-310000896159us-gaap:DomesticCountryMember2024-01-012024-12-310000896159us-gaap:DomesticCountryMember2023-01-012023-12-310000896159us-gaap:ForeignCountryMember2025-01-012025-12-310000896159us-gaap:ForeignCountryMember2024-01-012024-12-310000896159us-gaap:ForeignCountryMember2023-01-012023-12-310000896159country:CH2025-01-012025-12-310000896159country:BM2025-01-012025-12-310000896159country:US2025-01-012025-12-310000896159us-gaap:ForeignTaxJurisdictionOtherMember2025-01-012025-12-310000896159country:KR2025-01-012025-12-310000896159country:GB2025-01-012025-12-310000896159us-gaap:InvestmentsMember2025-12-310000896159us-gaap:DomesticCountryMember2025-12-310000896159srt:MinimumMembercountry:AU2025-01-012025-12-310000896159srt:MaximumMembercountry:AU2025-01-012025-12-310000896159srt:MinimumMembercountry:BR2025-01-012025-12-310000896159srt:MaximumMembercountry:BR2025-01-012025-12-310000896159srt:MinimumMembercountry:CA2025-01-012025-12-310000896159srt:MaximumMembercountry:CA2025-01-012025-12-310000896159srt:MinimumMembercountry:CN2025-01-012025-12-310000896159srt:MaximumMembercountry:CN2025-01-012025-12-310000896159srt:MinimumMembercountry:FR2025-01-012025-12-310000896159srt:MaximumMembercountry:FR2025-01-012025-12-310000896159srt:MinimumMembercountry:DE2025-01-012025-12-310000896159srt:MaximumMembercountry:DE2025-01-012025-12-310000896159srt:MinimumMembercountry:IT2025-01-012025-12-310000896159srt:MaximumMembercountry:IT2025-01-012025-12-310000896159srt:MinimumMembercountry:KR2025-01-012025-12-310000896159srt:MaximumMembercountry:KR2025-01-012025-12-310000896159srt:MinimumMembercountry:MX2025-01-012025-12-310000896159srt:MaximumMembercountry:MX2025-01-012025-12-310000896159srt:MinimumMembercountry:ES2025-01-012025-12-310000896159srt:MaximumMembercountry:ES2025-01-012025-12-310000896159srt:MinimumMembercountry:CH2025-01-012025-12-310000896159srt:MaximumMembercountry:CH2025-01-012025-12-310000896159srt:MinimumMembercountry:GB2025-01-012025-12-310000896159srt:MaximumMembercountry:GB2025-01-012025-12-310000896159srt:MinimumMembercountry:US2025-01-012025-12-310000896159srt:MaximumMembercountry:US2025-01-012025-12-310000896159cb:INASeniorNotesDueMarch2025Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueMarch2025Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueMay2026Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueMay2026Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueMay2026Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueMay2026Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueJune2027Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueJune2027Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueMarch2028Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueMarch2028Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INACNHTermLoanDueApril2028Memberus-gaap:LoansMember2025-12-310000896159cb:INACNHTermLoanDueApril2028Memberus-gaap:LoansMember2024-12-310000896159cb:INACNHTermLoanDueJuly2028Memberus-gaap:LoansMember2025-12-310000896159cb:INACNHTermLoanDueJuly2028Memberus-gaap:LoansMember2024-12-310000896159cb:INADebenturesDueAugust2029Memberus-gaap:UnsecuredDebtMember2025-12-310000896159cb:INADebenturesDueAugust2029Memberus-gaap:UnsecuredDebtMember2024-12-310000896159cb:INASeniorNotesDueAugust2029Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueAugust2029Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueDecember2029Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueDecember2029Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INACNYBondDue2030Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INACNYBondDue2030Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueSeptember2030Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueSeptember2030Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueJune2031Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueJune2031Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INADebenturesDueNovember2031Memberus-gaap:UnsecuredDebtMember2025-12-310000896159cb:INADebenturesDueNovember2031Memberus-gaap:UnsecuredDebtMember2024-12-310000896159cb:INASeniorNotesDueMarch2034Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueMarch2034Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INACNYBondDue2035Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INACNYBondDue2035Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueAugust2035Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueAugust2035Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueMay2036Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueMay2036Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueMay2037Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueMay2037Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueMarch2038Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueMarch2038Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueMay2038Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueMay2038Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueMarch2043Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueMarch2043Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueNovember2045Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueNovember2045Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueDecember2051Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueDecember2051Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INACNYBondDue2055Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INACNYBondDue2055Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:INASeniorNotesDueDecember2061Memberus-gaap:SeniorNotesMember2025-12-310000896159cb:INASeniorNotesDueDecember2061Memberus-gaap:SeniorNotesMember2024-12-310000896159cb:AceInaCapitalSecuritiesDue2030Memberus-gaap:TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember2025-12-310000896159cb:AceInaCapitalSecuritiesDue2030Memberus-gaap:TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember2024-12-310000896159cb:HuataiSupplementaryBondsDueNovember2034Member2025-12-310000896159cb:HuataiSupplementaryBondsDueNovember2034Member2024-12-310000896159cb:CommercialPaperProgramMemberus-gaap:CommercialPaperMember2025-12-310000896159cb:GroupSyndicatedCreditFacilityMember2025-12-310000896159cb:AceInaCapitalSecuritiesDue2030Memberus-gaap:TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember2000-03-310000896159cb:HuataiSupplementaryBondsDueNovember2034Member2024-11-300000896159us-gaap:ForeignExchangeFutureMemberus-gaap:OtherAssetsMember2025-12-310000896159us-gaap:ForeignExchangeFutureMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2025-12-310000896159us-gaap:ForeignExchangeFutureMember2025-12-310000896159us-gaap:ForeignExchangeFutureMemberus-gaap:OtherAssetsMember2024-12-310000896159us-gaap:ForeignExchangeFutureMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2024-12-310000896159us-gaap:ForeignExchangeFutureMember2024-12-310000896159us-gaap:FutureMemberus-gaap:OtherAssetsMember2025-12-310000896159us-gaap:FutureMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2025-12-310000896159us-gaap:FutureMember2025-12-310000896159us-gaap:FutureMemberus-gaap:OtherAssetsMember2024-12-310000896159us-gaap:FutureMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2024-12-310000896159us-gaap:FutureMember2024-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMemberus-gaap:FixedMaturitiesMember2025-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMemberus-gaap:EquitySecuritiesMember2025-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMember2025-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMemberus-gaap:FixedMaturitiesMember2024-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMemberus-gaap:EquitySecuritiesMember2024-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMember2024-12-310000896159cb:InvestmentAndEmbeddedDerivativeInstrumentsMember2025-12-310000896159cb:InvestmentAndEmbeddedDerivativeInstrumentsMember2024-12-310000896159us-gaap:SingleStockFutureMemberus-gaap:OtherAssetsMember2025-12-310000896159us-gaap:SingleStockFutureMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2025-12-310000896159us-gaap:SingleStockFutureMember2025-12-310000896159us-gaap:SingleStockFutureMemberus-gaap:OtherAssetsMember2024-12-310000896159us-gaap:SingleStockFutureMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2024-12-310000896159us-gaap:SingleStockFutureMember2024-12-310000896159us-gaap:OtherContractMemberus-gaap:OtherAssetsMember2025-12-310000896159us-gaap:OtherContractMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2025-12-310000896159us-gaap:OtherContractMember2025-12-310000896159us-gaap:OtherContractMemberus-gaap:OtherAssetsMember2024-12-310000896159us-gaap:OtherContractMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2024-12-310000896159us-gaap:OtherContractMember2024-12-310000896159cb:OtherDerivativesTotalMemberus-gaap:OtherAssetsMember2025-12-310000896159cb:OtherDerivativesTotalMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2025-12-310000896159cb:OtherDerivativesTotalMember2025-12-310000896159cb:OtherDerivativesTotalMemberus-gaap:OtherAssetsMember2024-12-310000896159cb:OtherDerivativesTotalMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2024-12-310000896159cb:OtherDerivativesTotalMember2024-12-310000896159us-gaap:FairValueHedgingMemberus-gaap:OtherAssetsMember2025-12-310000896159us-gaap:FairValueHedgingMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2025-12-310000896159us-gaap:FairValueHedgingMember2025-12-310000896159us-gaap:FairValueHedgingMemberus-gaap:OtherAssetsMember2024-12-310000896159us-gaap:FairValueHedgingMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2024-12-310000896159us-gaap:FairValueHedgingMember2024-12-310000896159us-gaap:NetInvestmentHedgingMemberus-gaap:OtherAssetsMember2025-12-310000896159us-gaap:NetInvestmentHedgingMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2025-12-310000896159us-gaap:NetInvestmentHedgingMember2025-12-310000896159us-gaap:NetInvestmentHedgingMemberus-gaap:OtherAssetsMember2024-12-310000896159us-gaap:NetInvestmentHedgingMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMember2024-12-310000896159us-gaap:NetInvestmentHedgingMember2024-12-310000896159us-gaap:DesignatedAsHedgingInstrumentMember2025-12-310000896159us-gaap:DesignatedAsHedgingInstrumentMember2024-12-310000896159us-gaap:LongTermDebtMember2025-12-310000896159us-gaap:FairValueHedgingMember2025-01-012025-12-310000896159us-gaap:FairValueHedgingMember2024-01-012024-12-310000896159us-gaap:CurrencySwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueHedgingMember2025-01-012025-12-310000896159us-gaap:CurrencySwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueHedgingMember2024-01-012024-12-310000896159us-gaap:NetInvestmentHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMember2025-01-012025-12-310000896159us-gaap:NetInvestmentHedgingMember2025-01-012025-12-310000896159us-gaap:NetInvestmentHedgingMember2024-01-012024-12-310000896159us-gaap:CurrencySwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:NetInvestmentHedgingMember2025-01-012025-12-310000896159us-gaap:CurrencySwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:NetInvestmentHedgingMember2024-01-012024-12-310000896159us-gaap:DesignatedAsHedgingInstrumentMembercb:INACNHTermLoanDueApril2028Memberus-gaap:NetInvestmentHedgingMember2025-01-012025-12-310000896159us-gaap:DesignatedAsHedgingInstrumentMembercb:INACNHTermLoanDueApril2028Memberus-gaap:NetInvestmentHedgingMember2024-01-012024-12-310000896159us-gaap:ForeignExchangeFutureMember2025-01-012025-12-310000896159us-gaap:ForeignExchangeFutureMember2024-01-012024-12-310000896159us-gaap:ForeignExchangeFutureMember2023-01-012023-12-310000896159us-gaap:FutureMember2025-01-012025-12-310000896159us-gaap:FutureMember2024-01-012024-12-310000896159us-gaap:FutureMember2023-01-012023-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMember2025-01-012025-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMember2024-01-012024-12-310000896159us-gaap:ConvertiblesAndBondsWithWarrantsAttachedMember2023-01-012023-12-310000896159cb:InvestmentAndEmbeddedDerivativeInstrumentsMember2025-01-012025-12-310000896159cb:InvestmentAndEmbeddedDerivativeInstrumentsMember2024-01-012024-12-310000896159cb:InvestmentAndEmbeddedDerivativeInstrumentsMember2023-01-012023-12-310000896159us-gaap:SingleStockFutureMember2025-01-012025-12-310000896159us-gaap:SingleStockFutureMember2024-01-012024-12-310000896159us-gaap:SingleStockFutureMember2023-01-012023-12-310000896159cb:GuaranteedLivingBenefitAndOtherDerivativeInstrumentsMember2025-01-012025-12-310000896159cb:GuaranteedLivingBenefitAndOtherDerivativeInstrumentsMember2024-01-012024-12-310000896159cb:GuaranteedLivingBenefitAndOtherDerivativeInstrumentsMember2023-01-012023-12-310000896159us-gaap:CashAndCashEquivalentsMemberus-gaap:MaturityOvernightMember2025-12-310000896159us-gaap:CashAndCashEquivalentsMemberus-gaap:MaturityOvernightMember2024-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:MaturityOvernightMember2025-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:MaturityOvernightMember2024-12-310000896159us-gaap:ForeignGovernmentDebtMemberus-gaap:MaturityOvernightMember2025-12-310000896159us-gaap:ForeignGovernmentDebtMemberus-gaap:MaturityOvernightMember2024-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:MaturityOvernightMember2025-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:MaturityOvernightMember2024-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:MaturityOvernightMember2025-12-310000896159us-gaap:EquitySecuritiesMemberus-gaap:MaturityOvernightMember2024-12-310000896159us-gaap:CashAndCashEquivalentsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityUpTo30DaysMember2025-12-310000896159us-gaap:CashAndCashEquivalentsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:Maturity30To90DaysMember2025-12-310000896159us-gaap:CashAndCashEquivalentsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityOver90DaysMember2025-12-310000896159us-gaap:CashAndCashEquivalentsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMember2025-12-310000896159us-gaap:CashAndCashEquivalentsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityUpTo30DaysMember2024-12-310000896159us-gaap:CashAndCashEquivalentsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:Maturity30To90DaysMember2024-12-310000896159us-gaap:CashAndCashEquivalentsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityOver90DaysMember2024-12-310000896159us-gaap:CashAndCashEquivalentsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMember2024-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityUpTo30DaysMember2025-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:Maturity30To90DaysMember2025-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityOver90DaysMember2025-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:AssetPledgedAsCollateralWithoutRightMember2025-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityUpTo30DaysMember2024-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:Maturity30To90DaysMember2024-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityOver90DaysMember2024-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:AssetPledgedAsCollateralWithoutRightMember2024-12-310000896159us-gaap:NonUsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityUpTo30DaysMember2025-12-310000896159us-gaap:NonUsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:Maturity30To90DaysMember2025-12-310000896159us-gaap:NonUsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityOver90DaysMember2025-12-310000896159us-gaap:NonUsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMember2025-12-310000896159us-gaap:NonUsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityUpTo30DaysMember2024-12-310000896159us-gaap:NonUsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:Maturity30To90DaysMember2024-12-310000896159us-gaap:NonUsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityOver90DaysMember2024-12-310000896159us-gaap:NonUsMemberus-gaap:AssetPledgedAsCollateralWithoutRightMember2024-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityUpTo30DaysMember2025-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:Maturity30To90DaysMember2025-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityOver90DaysMember2025-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:AssetPledgedAsCollateralWithoutRightMember2025-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityUpTo30DaysMember2024-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:Maturity30To90DaysMember2024-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityOver90DaysMember2024-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:AssetPledgedAsCollateralWithoutRightMember2024-12-310000896159us-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityUpTo30DaysMember2025-12-310000896159us-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:Maturity30To90DaysMember2025-12-310000896159us-gaap:MaturityOver90DaysMember2025-12-310000896159us-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityUpTo30DaysMember2024-12-310000896159us-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:Maturity30To90DaysMember2024-12-310000896159us-gaap:AssetPledgedAsCollateralWithoutRightMemberus-gaap:MaturityOver90DaysMember2024-12-310000896159us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseMember2025-12-310000896159us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseMember2024-12-310000896159us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2025-12-310000896159us-gaap:SecuritiesSoldUnderAgreementsToRepurchaseMemberus-gaap:VariableInterestEntityPrimaryBeneficiaryMember2024-12-310000896159us-gaap:RepurchaseAgreementsMember2025-12-310000896159us-gaap:RepurchaseAgreementsMember2024-12-310000896159us-gaap:SalesRevenueNetMember2025-01-012025-12-310000896159us-gaap:SalesRevenueNetMember2023-01-012023-12-310000896159us-gaap:SalesRevenueNetMember2024-01-012024-12-310000896159us-gaap:FixedMaturitiesMember2025-12-310000896159us-gaap:FixedMaturitiesMember2024-12-310000896159us-gaap:LetterOfCreditMember2025-12-310000896159us-gaap:LetterOfCreditMember2024-12-3100008961592025-05-1500008961592024-05-1600008961592023-05-1700008961592025-03-072025-03-0700008961592024-05-212024-05-2100008961592023-05-222023-05-220000896159cb:CapitalBandUpperLimitMember2025-12-310000896159cb:CapitalBandLowerLimitMember2025-12-310000896159cb:IssuanceofDebt1Member2025-12-310000896159cb:EmployeeBenefitPlansMember2025-12-310000896159cb:A2022StockRepurchasePlanMember2022-05-190000896159cb:July2023StockRepurchasePlanMember2023-07-010000896159cb:July2025StockRepurchasePlanMember2025-07-010000896159cb:July2025StockRepurchasePlanMember2025-01-012025-12-310000896159cb:July2023StockRepurchasePlanMember2024-01-012024-12-310000896159cb:A2022StockRepurchasePlanMember2023-01-012023-12-310000896159cb:July2025StockRepurchasePlanMemberus-gaap:SubsequentEventMember2026-01-012026-02-260000896159us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2024-12-310000896159us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2023-12-310000896159us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2022-12-310000896159us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:AccumulatedNetInvestmentGainLossAttributableToNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:AccumulatedNetInvestmentGainLossAttributableToNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:AccumulatedNetInvestmentGainLossAttributableToNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2025-12-310000896159us-gaap:AociLiabilityForFuturePolicyBenefitParentMember2024-12-310000896159us-gaap:AociLiabilityForFuturePolicyBenefitParentMember2023-12-310000896159us-gaap:AociLiabilityForFuturePolicyBenefitParentMember2022-12-310000896159us-gaap:AociLiabilityForFuturePolicyBenefitIncludingNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:AociLiabilityForFuturePolicyBenefitIncludingNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:AociLiabilityForFuturePolicyBenefitIncludingNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:AociLiabilityForFuturePolicyBenefitNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:AociLiabilityForFuturePolicyBenefitNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:AociLiabilityForFuturePolicyBenefitNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:AociLiabilityForFuturePolicyBenefitParentMember2025-12-310000896159us-gaap:AociMarketRiskBenefitInstrumentSpecificCreditRiskParentMember2024-12-310000896159us-gaap:AociMarketRiskBenefitInstrumentSpecificCreditRiskParentMember2023-12-310000896159us-gaap:AociMarketRiskBenefitInstrumentSpecificCreditRiskParentMember2022-12-310000896159us-gaap:AociMarketRiskBenefitInstrumentSpecificCreditRiskIncludingNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:AociMarketRiskBenefitInstrumentSpecificCreditRiskIncludingNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:AociMarketRiskBenefitInstrumentSpecificCreditRiskIncludingNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:AociMarketRiskBenefitInstrumentSpecificCreditRiskNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:AociMarketRiskBenefitInstrumentSpecificCreditRiskNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:AociMarketRiskBenefitInstrumentSpecificCreditRiskNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:AociMarketRiskBenefitInstrumentSpecificCreditRiskParentMember2025-12-310000896159us-gaap:AccumulatedTranslationAdjustmentMember2024-12-310000896159us-gaap:AccumulatedTranslationAdjustmentMember2023-12-310000896159us-gaap:AccumulatedTranslationAdjustmentMember2022-12-310000896159us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:AccumulatedTranslationAdjustmentMember2025-12-310000896159us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2024-12-310000896159us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2023-12-310000896159us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-12-310000896159us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:AccumulatedGainLossNetCashFlowHedgeNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:AccumulatedGainLossNetCashFlowHedgeNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:AccumulatedGainLossNetCashFlowHedgeNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2025-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2024-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2025-12-310000896159us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember2025-01-012025-12-310000896159us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember2024-01-012024-12-310000896159us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember2023-01-012023-12-310000896159us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2025-01-012025-12-310000896159us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2024-01-012024-12-310000896159us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2023-01-012023-12-310000896159us-gaap:PerformanceSharesMember2025-01-012025-12-310000896159cb:ChubbLimited2016LongTermIncentivePlanAmendedAndRestatedMemberus-gaap:CommonStockMember2025-12-310000896159us-gaap:EmployeeStockMemberus-gaap:CommonStockMember2025-12-310000896159us-gaap:EmployeeStockOptionMember2025-01-012025-12-310000896159us-gaap:EmployeeStockOptionMember2024-01-012024-12-310000896159us-gaap:EmployeeStockOptionMember2023-01-012023-12-310000896159us-gaap:RestrictedStockMember2025-01-012025-12-310000896159us-gaap:RestrictedStockMember2024-01-012024-12-310000896159us-gaap:RestrictedStockMember2023-01-012023-12-310000896159cb:ChubbLimited2016LongTermIncentivePlanAmendedAndRestatedMemberus-gaap:RestrictedStockMember2025-01-012025-12-310000896159us-gaap:RestrictedStockMember2022-12-310000896159us-gaap:PerformanceSharesMember2022-12-310000896159us-gaap:PerformanceSharesMember2023-01-012023-12-310000896159us-gaap:RestrictedStockMember2023-12-310000896159us-gaap:PerformanceSharesMember2023-12-310000896159us-gaap:PerformanceSharesMember2024-01-012024-12-310000896159us-gaap:RestrictedStockMember2024-12-310000896159us-gaap:PerformanceSharesMember2024-12-310000896159us-gaap:RestrictedStockMember2025-12-310000896159us-gaap:PerformanceSharesMember2025-12-310000896159cb:AceLimited2004LongTermIncentivePlanMemberus-gaap:RestrictedStockUnitsRSUMember2025-01-012025-12-310000896159us-gaap:RestrictedStockUnitsRSUMembersrt:MinimumMembercb:LegacyChubbCorpMember2025-01-012025-12-310000896159us-gaap:RestrictedStockUnitsRSUMembersrt:MaximumMembercb:LegacyChubbCorpMember2025-01-012025-12-310000896159us-gaap:RestrictedStockUnitsRSUMember2025-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2024-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMember2023-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2023-12-310000896159us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2024-12-310000896159us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMember2025-01-012025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2025-01-012025-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMember2024-01-012024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2024-01-012024-12-310000896159us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2025-01-012025-12-310000896159us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2024-01-012024-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2025-12-310000896159us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2025-12-310000896159us-gaap:PensionPlansDefinedBenefitMember2025-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMember2023-01-012023-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2023-01-012023-12-310000896159us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-12-310000896159us-gaap:GeneralAndAdministrativeExpenseMemberus-gaap:PensionPlansDefinedBenefitMember2025-01-012025-12-310000896159us-gaap:GeneralAndAdministrativeExpenseMemberus-gaap:PensionPlansDefinedBenefitMember2024-01-012024-12-310000896159us-gaap:GeneralAndAdministrativeExpenseMemberus-gaap:PensionPlansDefinedBenefitMember2023-01-012023-12-310000896159us-gaap:GeneralAndAdministrativeExpenseMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2025-01-012025-12-310000896159us-gaap:GeneralAndAdministrativeExpenseMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2024-01-012024-12-310000896159us-gaap:GeneralAndAdministrativeExpenseMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-12-310000896159us-gaap:PensionPlansDefinedBenefitMember2025-01-012025-12-310000896159us-gaap:PensionPlansDefinedBenefitMember2024-01-012024-12-310000896159us-gaap:PensionPlansDefinedBenefitMember2023-01-012023-12-310000896159cb:LossesandlossexpensesMemberus-gaap:PensionPlansDefinedBenefitMember2025-01-012025-12-310000896159cb:LossesandlossexpensesMemberus-gaap:PensionPlansDefinedBenefitMember2024-01-012024-12-310000896159cb:LossesandlossexpensesMemberus-gaap:PensionPlansDefinedBenefitMember2023-01-012023-12-310000896159cb:LossesandlossexpensesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2025-01-012025-12-310000896159cb:LossesandlossexpensesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2024-01-012024-12-310000896159cb:LossesandlossexpensesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMembercb:ServiceCostMember2025-01-012025-12-310000896159cb:ServiceCostMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2025-01-012025-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMembercb:InterestCostMember2025-01-012025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMembercb:InterestCostMember2025-01-012025-12-310000896159cb:InterestCostMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2025-01-012025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMembercb:ServiceCostMember2024-01-012024-12-310000896159cb:ServiceCostMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2024-01-012024-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMembercb:InterestCostMember2024-01-012024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMembercb:InterestCostMember2024-01-012024-12-310000896159cb:InterestCostMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2024-01-012024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMembercb:ServiceCostMember2023-01-012023-12-310000896159cb:ServiceCostMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMembercb:InterestCostMember2023-01-012023-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMembercb:InterestCostMember2023-01-012023-12-310000896159cb:InterestCostMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-12-310000896159srt:MinimumMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2025-12-310000896159srt:MaximumMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2025-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2025-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2025-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2025-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2025-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2025-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMember2025-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2025-12-310000896159country:UScb:InvestmentFundsLimitedPartnershipsPartiallyOwnedInvestmentCompaniesFairValueMemberus-gaap:PensionPlansDefinedBenefitMember2025-12-310000896159us-gaap:ForeignPlanMembercb:InvestmentFundsLimitedPartnershipsPartiallyOwnedInvestmentCompaniesFairValueMemberus-gaap:PensionPlansDefinedBenefitMember2025-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2024-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2024-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2024-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2024-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2024-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2024-12-310000896159country:USus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDerivativeMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMember2024-12-310000896159country:USus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ShortTermInvestmentsMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel1Memberus-gaap:PensionPlansDefinedBenefitMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel2Memberus-gaap:PensionPlansDefinedBenefitMember2024-12-310000896159us-gaap:ForeignPlanMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2024-12-310000896159country:UScb:InvestmentFundsLimitedPartnershipsPartiallyOwnedInvestmentCompaniesFairValueMemberus-gaap:PensionPlansDefinedBenefitMember2024-12-310000896159us-gaap:ForeignPlanMembercb:InvestmentFundsLimitedPartnershipsPartiallyOwnedInvestmentCompaniesFairValueMemberus-gaap:PensionPlansDefinedBenefitMember2024-12-310000896159us-gaap:FairValueInputsLevel2Memberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FixedMaturitiesMember2024-12-310000896159us-gaap:OtherInvestmentsMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2024-12-310000896159cb:PartiallyOwnedInvestmentCompaniesMember2025-01-012025-12-310000896159cb:PartiallyOwnedInvestmentCompaniesMember2024-01-012024-12-310000896159cb:PartiallyOwnedInvestmentCompaniesMember2023-01-012023-12-310000896159cb:HuataiGroupMember2023-01-012023-06-300000896159cb:SegmentInsuranceNorthAmericanCommercialPCMember2025-01-012025-12-310000896159cb:SegmentCorporateAndOtherMember2025-01-012025-12-310000896159cb:SegmentInsuranceNorthAmericanCommercialPCMember2024-01-012024-12-310000896159cb:SegmentCorporateAndOtherMember2024-01-012024-12-310000896159cb:SegmentInsuranceNorthAmericanCommercialPCMember2023-01-012023-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMember2023-01-012023-12-310000896159cb:SegmentCorporateAndOtherMember2023-01-012023-12-310000896159cb:SegmentInsuranceNorthAmericanCommercialPCMembercb:PropertyandothershorttailMember2025-01-012025-12-310000896159cb:SegmentInsuranceNorthAmericanCommercialPCMembercb:PropertyandothershorttailMember2024-01-012024-12-310000896159cb:SegmentInsuranceNorthAmericanCommercialPCMembercb:PropertyandothershorttailMember2023-01-012023-12-310000896159cb:SegmentInsuranceNorthAmericanCommercialPCMembercb:CasualtyandallotherMember2025-01-012025-12-310000896159cb:SegmentInsuranceNorthAmericanCommercialPCMembercb:CasualtyandallotherMember2024-01-012024-12-310000896159cb:SegmentInsuranceNorthAmericanCommercialPCMembercb:CasualtyandallotherMember2023-01-012023-12-310000896159cb:SegmentInsuranceNorthAmericanCommercialPCMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2025-01-012025-12-310000896159cb:SegmentInsuranceNorthAmericanCommercialPCMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2024-01-012024-12-310000896159cb:SegmentInsuranceNorthAmericanCommercialPCMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2023-01-012023-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMemberus-gaap:AutomobilesMember2025-01-012025-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMemberus-gaap:AutomobilesMember2024-01-012024-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMemberus-gaap:AutomobilesMember2023-01-012023-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMembercb:PersonalhomeownerMember2025-01-012025-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMembercb:PersonalhomeownerMember2024-01-012024-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMembercb:PersonalhomeownerMember2023-01-012023-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMemberus-gaap:OtherInsuranceProductLineMember2025-01-012025-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMemberus-gaap:OtherInsuranceProductLineMember2024-01-012024-12-310000896159cb:SegmentInsuranceNorthAmericanPersonalPCMemberus-gaap:OtherInsuranceProductLineMember2023-01-012023-12-310000896159cb:SegmentInsuranceOverseasGeneralMembercb:PropertyandothershorttailMember2025-01-012025-12-310000896159cb:SegmentInsuranceOverseasGeneralMembercb:PropertyandothershorttailMember2024-01-012024-12-310000896159cb:SegmentInsuranceOverseasGeneralMembercb:PropertyandothershorttailMember2023-01-012023-12-310000896159cb:SegmentInsuranceOverseasGeneralMembercb:CasualtyandallotherMember2025-01-012025-12-310000896159cb:SegmentInsuranceOverseasGeneralMembercb:CasualtyandallotherMember2024-01-012024-12-310000896159cb:SegmentInsuranceOverseasGeneralMembercb:CasualtyandallotherMember2023-01-012023-12-310000896159cb:SegmentInsuranceOverseasGeneralMembercb:PersonalLinesMember2025-01-012025-12-310000896159cb:SegmentInsuranceOverseasGeneralMembercb:PersonalLinesMember2024-01-012024-12-310000896159cb:SegmentInsuranceOverseasGeneralMembercb:PersonalLinesMember2023-01-012023-12-310000896159cb:SegmentInsuranceOverseasGeneralMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2025-01-012025-12-310000896159cb:SegmentInsuranceOverseasGeneralMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2024-01-012024-12-310000896159cb:SegmentInsuranceOverseasGeneralMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2023-01-012023-12-310000896159cb:SegmentGlobalReinsuranceMembercb:PropertyandothershorttailMember2025-01-012025-12-310000896159cb:SegmentGlobalReinsuranceMembercb:PropertyandothershorttailMember2024-01-012024-12-310000896159cb:SegmentGlobalReinsuranceMembercb:PropertyandothershorttailMember2023-01-012023-12-310000896159cb:SegmentGlobalReinsuranceMembercb:PropertycatastropheMember2025-01-012025-12-310000896159cb:SegmentGlobalReinsuranceMembercb:PropertycatastropheMember2024-01-012024-12-310000896159cb:SegmentGlobalReinsuranceMembercb:PropertycatastropheMember2023-01-012023-12-310000896159cb:SegmentGlobalReinsuranceMembercb:CasualtyandallotherMember2025-01-012025-12-310000896159cb:SegmentGlobalReinsuranceMembercb:CasualtyandallotherMember2024-01-012024-12-310000896159cb:SegmentGlobalReinsuranceMembercb:CasualtyandallotherMember2023-01-012023-12-310000896159cb:SegmentLifeMemberus-gaap:LifeInsuranceSegmentMember2025-01-012025-12-310000896159cb:SegmentLifeMemberus-gaap:LifeInsuranceSegmentMember2024-01-012024-12-310000896159cb:SegmentLifeMemberus-gaap:LifeInsuranceSegmentMember2023-01-012023-12-310000896159cb:SegmentLifeMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2025-01-012025-12-310000896159cb:SegmentLifeMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2024-01-012024-12-310000896159cb:SegmentLifeMemberus-gaap:AccidentAndHealthInsuranceSegmentMember2023-01-012023-12-310000896159srt:NorthAmericaMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2025-01-012025-12-310000896159srt:EuropeMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2025-01-012025-12-310000896159srt:AsiaMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2025-01-012025-12-310000896159srt:LatinAmericaMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2025-01-012025-12-310000896159srt:NorthAmericaMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2024-01-012024-12-310000896159srt:EuropeMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2024-01-012024-12-310000896159srt:AsiaMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2024-01-012024-12-310000896159srt:LatinAmericaMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2024-01-012024-12-310000896159srt:NorthAmericaMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2023-01-012023-12-310000896159srt:EuropeMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2023-01-012023-12-310000896159srt:AsiaMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2023-01-012023-12-310000896159srt:LatinAmericaMemberus-gaap:GeographicConcentrationRiskMemberus-gaap:SalesRevenueNetMember2023-01-012023-12-310000896159country:BMcb:ABRReinsuranceCapitalHoldingsLtd.Membercb:ABRReinsuranceCapitalHoldingsLtd.Member2025-12-310000896159us-gaap:RelatedPartyMembercb:BlackRockIncMember2025-01-012025-12-310000896159us-gaap:RelatedPartyMembercb:BlackRockIncMember2024-01-012024-12-310000896159us-gaap:RelatedPartyMembercb:BlackRockIncMember2023-01-012023-12-310000896159cb:ABRReinsuranceCapitalHoldingsLtd.Member2025-01-012025-12-310000896159cb:ABRReinsuranceCapitalHoldingsLtd.Member2024-01-012024-12-310000896159cb:ABRReinsuranceCapitalHoldingsLtd.Member2023-01-012023-12-310000896159cb:ABRReinsuranceCapitalHoldingsLtd.Member2025-12-310000896159cb:ABRReinsuranceCapitalHoldingsLtd.Member2024-12-310000896159cb:AquilineCapitalPartnersLLCMember2025-12-310000896159cb:AquilineCapitalPartnersLLCMember2025-01-012025-12-310000896159cb:AquilineCapitalPartnersLLCMember2024-01-012024-12-310000896159cb:AquilineCapitalPartnersLLCMember2023-01-012023-12-310000896159cb:AquilineCapitalPartnersLLCMember2024-12-310000896159cb:StarrTechnicalRiskAgencyandAffiliatesMember2025-12-310000896159cb:StarrTechnicalRiskAgencyandAffiliatesMember2024-01-012024-12-310000896159cb:StarrTechnicalRiskAgencyandAffiliatesMember2023-01-012023-12-310000896159cb:StarrTechnicalRiskAgencyandAffiliatesMember2024-12-310000896159cb:PropertyAndCasualtySubsidiariesMember2025-12-310000896159cb:PropertyAndCasualtySubsidiariesMember2024-12-310000896159cb:LifeSubsidiariesMember2025-12-310000896159cb:LifeSubsidiariesMember2024-12-310000896159cb:PropertyAndCasualtySubsidiariesMember2025-01-012025-12-310000896159cb:PropertyAndCasualtySubsidiariesMember2024-01-012024-12-310000896159cb:PropertyAndCasualtySubsidiariesMember2023-01-012023-12-310000896159cb:LifeSubsidiariesMember2025-01-012025-12-310000896159cb:LifeSubsidiariesMember2024-01-012024-12-310000896159cb:LifeSubsidiariesMember2023-01-012023-12-310000896159us-gaap:ShortTermInvestmentsMember2025-12-310000896159us-gaap:USTreasuryAndGovernmentMemberus-gaap:AvailableforsaleSecuritiesMember2025-12-310000896159us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:AvailableforsaleSecuritiesMember2025-12-310000896159us-gaap:CorporateDebtSecuritiesMemberus-gaap:AvailableforsaleSecuritiesMember2025-12-310000896159us-gaap:MortgageBackedSecuritiesMemberus-gaap:AvailableforsaleSecuritiesMember2025-12-310000896159us-gaap:AvailableforsaleSecuritiesMember2025-12-310000896159cb:PrivateDebtHeldForInvestmentMember2025-12-310000896159us-gaap:IndustrialMiscellaneousAndAllOthersMember2025-12-310000896159cb:AlternativeInvestmentMember2025-12-310000896159us-gaap:OtherLongTermInvestmentsMember2025-12-310000896159cb:AllRelatedPartyMember2025-12-310000896159srt:ParentCompanyMember2025-12-310000896159srt:ParentCompanyMember2024-12-310000896159srt:ParentCompanyMember2025-01-012025-12-310000896159srt:ParentCompanyMember2024-01-012024-12-310000896159srt:ParentCompanyMember2023-01-012023-12-310000896159srt:ParentCompanyMember2023-12-310000896159srt:ParentCompanyMember2022-12-310000896159us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2025-01-012025-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMember2025-01-012025-12-310000896159us-gaap:LifeInsuranceSegmentMember2025-01-012025-12-310000896159us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2024-01-012024-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMember2024-01-012024-12-310000896159us-gaap:LifeInsuranceSegmentMember2024-01-012024-12-310000896159us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2023-01-012023-12-310000896159us-gaap:AccidentAndHealthInsuranceSegmentMember2023-01-012023-12-310000896159us-gaap:LifeInsuranceSegmentMember2023-01-012023-12-31 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☑ANNUAL REPORT PURSUANT TO SECTION 13…