0000086312false2020FYus-gaap:AccountingStandardsUpdate201613Memberus-gaap:AccountingStandardsUpdate201601Memberus-gaap:AccountingStandardsUpdate201601Memberus-gaap:AccountingStandardsUpdate201601Memberus-gaap:OtherAssetsus-gaap:OtherLiabilitiesus-gaap:AccountingStandardsUpdate201613Memberus-gaap:AccountingStandardsUpdate201601Memberus-gaap:AccountingStandardsUpdate201613Memberus-gaap:AccountingStandardsUpdate201613Memberus-gaap:AccountingStandardsUpdate201613Memberus-gaap:AccountingStandardsUpdate201601Memberus-gaap:OtherLiabilitiesus-gaap:AccountingStandardsUpdate201613Member00000863122020-01-012020-12-31iso4217:USD00000863122020-06-30xbrli:shares00000863122021-02-0500000863122019-01-012019-12-3100000863122018-01-012018-12-31iso4217:USDxbrli:shares00000863122020-12-3100000863122019-12-310000086312us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2019-12-310000086312us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2018-12-310000086312us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2017-12-310000086312us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2020-01-012020-12-310000086312us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2019-01-012019-12-310000086312us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2018-01-012018-12-310000086312us-gaap:CommonStockIncludingAdditionalPaidInCapitalMember2020-12-310000086312us-gaap:RetainedEarningsMember2019-12-310000086312us-gaap:RetainedEarningsMember2018-12-310000086312us-gaap:RetainedEarningsMember2017-12-310000086312us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310000086312us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2017-12-310000086312us-gaap:RetainedEarningsMember2018-01-012018-01-010000086312us-gaap:RetainedEarningsMember2020-01-012020-12-310000086312us-gaap:RetainedEarningsMember2019-01-012019-12-310000086312us-gaap:RetainedEarningsMember2018-01-012018-12-310000086312us-gaap:RetainedEarningsMember2020-12-310000086312us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310000086312us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-310000086312us-gaap:AccumulatedOtherComprehensiveIncomeMember2017-12-310000086312us-gaap:AccumulatedOtherComprehensiveIncomeMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2017-12-310000086312us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-01-012018-01-010000086312us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310000086312us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310000086312us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310000086312us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000086312us-gaap:TreasuryStockMember2019-12-310000086312us-gaap:TreasuryStockMember2018-12-310000086312us-gaap:TreasuryStockMember2017-12-310000086312us-gaap:TreasuryStockMember2020-01-012020-12-310000086312us-gaap:TreasuryStockMember2019-01-012019-12-310000086312us-gaap:TreasuryStockMember2018-01-012018-12-310000086312us-gaap:TreasuryStockMember2020-12-3100000863122018-12-310000086312us-gaap:CommonStockMember2019-12-310000086312us-gaap:CommonStockMember2018-12-310000086312us-gaap:CommonStockMember2017-12-310000086312us-gaap:CommonStockMember2020-01-012020-12-310000086312us-gaap:CommonStockMember2019-01-012019-12-310000086312us-gaap:CommonStockMember2018-01-012018-12-310000086312us-gaap:CommonStockMember2020-12-3100000863122017-12-310000086312us-gaap:AccumulatedOtherComprehensiveIncomeMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2018-01-010000086312us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2018-01-010000086312us-gaap:AccountingStandardsUpdate201602Member2019-03-3100000863122019-03-310000086312us-gaap:RetainedEarningsMemberus-gaap:AccountingStandardsUpdate201602Member2019-01-010000086312us-gaap:RetainedEarningsMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2020-01-01xbrli:puretrv:segmenttrv:businesses0000086312trv:JMalucelliMember2020-12-310000086312trv:JMalucelliLatamMember2020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BondAndSpecialtyInsuranceMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembertrv:PersonalInsuranceMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembertrv:BondAndSpecialtyInsuranceMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembertrv:PersonalInsuranceMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembertrv:BondAndSpecialtyInsuranceMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembertrv:PersonalInsuranceMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMember2018-01-012018-12-310000086312trv:BusinessAndInternationalInsuranceMembercountry:UStrv:SelectAccountsMember2020-01-012020-12-310000086312trv:BusinessAndInternationalInsuranceMembercountry:UStrv:SelectAccountsMember2019-01-012019-12-310000086312trv:BusinessAndInternationalInsuranceMembercountry:UStrv:SelectAccountsMember2018-01-012018-12-310000086312trv:BusinessAndInternationalInsuranceMembercountry:UStrv:MiddleMarketMember2020-01-012020-12-310000086312trv:BusinessAndInternationalInsuranceMembercountry:UStrv:MiddleMarketMember2019-01-012019-12-310000086312trv:BusinessAndInternationalInsuranceMembercountry:UStrv:MiddleMarketMember2018-01-012018-12-310000086312trv:NationalAccountsMembertrv:BusinessAndInternationalInsuranceMembercountry:US2020-01-012020-12-310000086312trv:NationalAccountsMembertrv:BusinessAndInternationalInsuranceMembercountry:US2019-01-012019-12-310000086312trv:NationalAccountsMembertrv:BusinessAndInternationalInsuranceMembercountry:US2018-01-012018-12-310000086312trv:OtherDomesticMembertrv:BusinessAndInternationalInsuranceMembercountry:US2020-01-012020-12-310000086312trv:OtherDomesticMembertrv:BusinessAndInternationalInsuranceMembercountry:US2019-01-012019-12-310000086312trv:OtherDomesticMembertrv:BusinessAndInternationalInsuranceMembercountry:US2018-01-012018-12-310000086312trv:BusinessAndInternationalInsuranceMembercountry:US2020-01-012020-12-310000086312trv:BusinessAndInternationalInsuranceMembercountry:US2019-01-012019-12-310000086312trv:BusinessAndInternationalInsuranceMembercountry:US2018-01-012018-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:NonUsMember2020-01-012020-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:NonUsMember2019-01-012019-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:NonUsMember2018-01-012018-12-310000086312trv:BusinessAndInternationalInsuranceMember2020-01-012020-12-310000086312trv:BusinessAndInternationalInsuranceMember2019-01-012019-12-310000086312trv:BusinessAndInternationalInsuranceMember2018-01-012018-12-310000086312country:UStrv:BondAndSpecialtyInsuranceMembertrv:ManagementLiabilityMember2020-01-012020-12-310000086312country:UStrv:BondAndSpecialtyInsuranceMembertrv:ManagementLiabilityMember2019-01-012019-12-310000086312country:UStrv:BondAndSpecialtyInsuranceMembertrv:ManagementLiabilityMember2018-01-012018-12-310000086312trv:SuretyMembercountry:UStrv:BondAndSpecialtyInsuranceMember2020-01-012020-12-310000086312trv:SuretyMembercountry:UStrv:BondAndSpecialtyInsuranceMember2019-01-012019-12-310000086312trv:SuretyMembercountry:UStrv:BondAndSpecialtyInsuranceMember2018-01-012018-12-310000086312country:UStrv:BondAndSpecialtyInsuranceMember2020-01-012020-12-310000086312country:UStrv:BondAndSpecialtyInsuranceMember2019-01-012019-12-310000086312country:UStrv:BondAndSpecialtyInsuranceMember2018-01-012018-12-310000086312us-gaap:NonUsMembertrv:BondAndSpecialtyInsuranceMember2020-01-012020-12-310000086312us-gaap:NonUsMembertrv:BondAndSpecialtyInsuranceMember2019-01-012019-12-310000086312us-gaap:NonUsMembertrv:BondAndSpecialtyInsuranceMember2018-01-012018-12-310000086312trv:BondAndSpecialtyInsuranceMember2020-01-012020-12-310000086312trv:BondAndSpecialtyInsuranceMember2019-01-012019-12-310000086312trv:BondAndSpecialtyInsuranceMember2018-01-012018-12-310000086312country:UStrv:PersonalInsuranceMembertrv:AgencyAutomobileMember2020-01-012020-12-310000086312country:UStrv:PersonalInsuranceMembertrv:AgencyAutomobileMember2019-01-012019-12-310000086312country:UStrv:PersonalInsuranceMembertrv:AgencyAutomobileMember2018-01-012018-12-310000086312trv:AgencyHomeownersAndOtherMembercountry:UStrv:PersonalInsuranceMember2020-01-012020-12-310000086312trv:AgencyHomeownersAndOtherMembercountry:UStrv:PersonalInsuranceMember2019-01-012019-12-310000086312trv:AgencyHomeownersAndOtherMembercountry:UStrv:PersonalInsuranceMember2018-01-012018-12-310000086312country:UStrv:TotalAgencyMembertrv:PersonalInsuranceMember2020-01-012020-12-310000086312country:UStrv:TotalAgencyMembertrv:PersonalInsuranceMember2019-01-012019-12-310000086312country:UStrv:TotalAgencyMembertrv:PersonalInsuranceMember2018-01-012018-12-310000086312country:UStrv:DirectToConsumerMembertrv:PersonalInsuranceMember2020-01-012020-12-310000086312country:UStrv:DirectToConsumerMembertrv:PersonalInsuranceMember2019-01-012019-12-310000086312country:UStrv:DirectToConsumerMembertrv:PersonalInsuranceMember2018-01-012018-12-310000086312country:UStrv:PersonalInsuranceMember2020-01-012020-12-310000086312country:UStrv:PersonalInsuranceMember2019-01-012019-12-310000086312country:UStrv:PersonalInsuranceMember2018-01-012018-12-310000086312us-gaap:NonUsMembertrv:PersonalInsuranceMember2020-01-012020-12-310000086312us-gaap:NonUsMembertrv:PersonalInsuranceMember2019-01-012019-12-310000086312us-gaap:NonUsMembertrv:PersonalInsuranceMember2018-01-012018-12-310000086312trv:PersonalInsuranceMember2020-01-012020-12-310000086312trv:PersonalInsuranceMember2019-01-012019-12-310000086312trv:PersonalInsuranceMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMembercountry:US2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMembercountry:US2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMembercountry:US2018-01-012018-12-310000086312trv:AutomobileMemberus-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembercountry:US2020-01-012020-12-310000086312trv:AutomobileMemberus-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembercountry:US2019-01-012019-12-310000086312trv:AutomobileMemberus-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembercountry:US2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMembercountry:US2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMembercountry:US2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMembercountry:US2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMembercountry:US2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMembercountry:US2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMembercountry:US2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembercountry:UStrv:CommercialMultiPerilMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembercountry:UStrv:CommercialMultiPerilMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembercountry:UStrv:CommercialMultiPerilMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembercountry:UStrv:OtherProductsAndServicesMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembercountry:UStrv:OtherProductsAndServicesMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembercountry:UStrv:OtherProductsAndServicesMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembercountry:US2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembercountry:US2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembercountry:US2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:NonUsMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:NonUsMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:NonUsMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembercountry:UStrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembercountry:UStrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembercountry:UStrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMemberus-gaap:GeneralLiabilityMembercountry:UStrv:BondAndSpecialtyInsuranceMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMemberus-gaap:GeneralLiabilityMembercountry:UStrv:BondAndSpecialtyInsuranceMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMemberus-gaap:GeneralLiabilityMembercountry:UStrv:BondAndSpecialtyInsuranceMember2018-01-012018-12-310000086312trv:OtherBondAndSpecialtyProductsAndServicesMemberus-gaap:OperatingSegmentsMembercountry:UStrv:BondAndSpecialtyInsuranceMember2020-01-012020-12-310000086312trv:OtherBondAndSpecialtyProductsAndServicesMemberus-gaap:OperatingSegmentsMembercountry:UStrv:BondAndSpecialtyInsuranceMember2019-01-012019-12-310000086312trv:OtherBondAndSpecialtyProductsAndServicesMemberus-gaap:OperatingSegmentsMembercountry:UStrv:BondAndSpecialtyInsuranceMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembercountry:UStrv:BondAndSpecialtyInsuranceMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembercountry:UStrv:BondAndSpecialtyInsuranceMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembercountry:UStrv:BondAndSpecialtyInsuranceMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMemberus-gaap:NonUsMembertrv:BondAndSpecialtyInsuranceMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMemberus-gaap:NonUsMembertrv:BondAndSpecialtyInsuranceMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMemberus-gaap:NonUsMembertrv:BondAndSpecialtyInsuranceMember2018-01-012018-12-310000086312trv:AutomobileMemberus-gaap:OperatingSegmentsMembercountry:UStrv:PersonalInsuranceMember2020-01-012020-12-310000086312trv:AutomobileMemberus-gaap:OperatingSegmentsMembercountry:UStrv:PersonalInsuranceMember2019-01-012019-12-310000086312trv:AutomobileMemberus-gaap:OperatingSegmentsMembercountry:UStrv:PersonalInsuranceMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembertrv:HomeownersAndOtherMembercountry:UStrv:PersonalInsuranceMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembertrv:HomeownersAndOtherMembercountry:UStrv:PersonalInsuranceMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembertrv:HomeownersAndOtherMembercountry:UStrv:PersonalInsuranceMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembercountry:UStrv:PersonalInsuranceMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMembercountry:UStrv:PersonalInsuranceMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMembercountry:UStrv:PersonalInsuranceMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMemberus-gaap:NonUsMembertrv:PersonalInsuranceMember2020-01-012020-12-310000086312us-gaap:OperatingSegmentsMemberus-gaap:NonUsMembertrv:PersonalInsuranceMember2019-01-012019-12-310000086312us-gaap:OperatingSegmentsMemberus-gaap:NonUsMembertrv:PersonalInsuranceMember2018-01-012018-12-310000086312trv:CorporateAndReconcilingItemsMember2020-01-012020-12-310000086312trv:CorporateAndReconcilingItemsMember2019-01-012019-12-310000086312trv:CorporateAndReconcilingItemsMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMember2019-12-310000086312us-gaap:OperatingSegmentsMembertrv:BondAndSpecialtyInsuranceMember2020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BondAndSpecialtyInsuranceMember2019-12-310000086312us-gaap:OperatingSegmentsMembertrv:PersonalInsuranceMember2020-12-310000086312us-gaap:OperatingSegmentsMembertrv:PersonalInsuranceMember2019-12-310000086312us-gaap:OperatingSegmentsMember2020-12-310000086312us-gaap:OperatingSegmentsMember2019-12-310000086312trv:CorporateAndReconcilingItemsMember2020-12-310000086312trv:CorporateAndReconcilingItemsMember2019-12-310000086312country:US2020-01-012020-12-310000086312country:US2019-01-012019-12-310000086312country:US2018-01-012018-12-310000086312country:CA2020-01-012020-12-310000086312country:CA2019-01-012019-12-310000086312country:CA2018-01-012018-12-310000086312trv:OtherNonUnitedStatesMember2020-01-012020-12-310000086312trv:OtherNonUnitedStatesMember2019-01-012019-12-310000086312trv:OtherNonUnitedStatesMember2018-01-012018-12-310000086312us-gaap:NonUsMember2020-01-012020-12-310000086312us-gaap:NonUsMember2019-01-012019-12-310000086312us-gaap:NonUsMember2018-01-012018-12-310000086312us-gaap:USTreasuryAndGovernmentMember2020-12-310000086312trv:USStatesAndPoliticalSubdivisionsLocalGeneralObligationMember2020-12-310000086312trv:USStatesAndPoliticalSubdivisionsRevenueMember2020-12-310000086312trv:USStatesAndPoliticalSubdivisionsStateGeneralObligationMember2020-12-310000086312trv:USStatesAndPoliticalSubdivisionsPreRefundedMember2020-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000086312us-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310000086312us-gaap:OtherDebtSecuritiesMember2020-12-310000086312us-gaap:RedeemablePreferredStockMember2020-12-310000086312us-gaap:USTreasuryAndGovernmentMember2019-12-310000086312trv:USStatesAndPoliticalSubdivisionsLocalGeneralObligationMember2019-12-310000086312trv:USStatesAndPoliticalSubdivisionsRevenueMember2019-12-310000086312trv:USStatesAndPoliticalSubdivisionsStateGeneralObligationMember2019-12-310000086312trv:USStatesAndPoliticalSubdivisionsPreRefundedMember2019-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310000086312us-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310000086312us-gaap:OtherDebtSecuritiesMember2019-12-310000086312us-gaap:RedeemablePreferredStockMember2019-12-310000086312trv:MortgageBackedSecuritiesIssuedByUSOrCADGovernmentSponsoredEnterprisesMember2020-12-310000086312trv:MortgageBackedSecuritiesIssuedByUSOrCADGovernmentSponsoredEnterprisesMember2019-12-310000086312us-gaap:CollateralizedDebtObligationsMember2020-12-310000086312us-gaap:CollateralizedDebtObligationsMember2019-12-310000086312trv:NonGuaranteedCollateralizedDebtObligationsMember2020-12-310000086312trv:NonGuaranteedCollateralizedDebtObligationsMember2019-12-310000086312us-gaap:CommercialMortgageBackedSecuritiesMember2020-12-310000086312us-gaap:CommercialMortgageBackedSecuritiesMember2019-12-310000086312trv:CommercialMortgageBackedSecuritiesContainingGuaranteesByUSGovernmentOrGovernmentSponsoredEnterpriseMember2020-12-310000086312trv:CommercialMortgageBackedSecuritiesContainingGuaranteesByUSGovernmentOrGovernmentSponsoredEnterpriseMember2019-12-310000086312trv:CommercialMortgageBackedSecuritiesNonGuaranteedSecuritiesMember2020-12-310000086312trv:CommercialMortgageBackedSecuritiesNonGuaranteedSecuritiesMember2019-12-310000086312srt:SubsidiariesMember2020-12-310000086312srt:SubsidiariesMember2019-12-310000086312srt:ParentCompanyMember2020-12-310000086312srt:ParentCompanyMember2019-12-310000086312us-gaap:CommonStockMember2020-12-310000086312us-gaap:CommonStockMember2020-01-012020-12-310000086312us-gaap:NonredeemablePreferredStockMember2020-12-310000086312us-gaap:NonredeemablePreferredStockMember2020-01-012020-12-310000086312us-gaap:CommonStockMember2019-12-310000086312us-gaap:CommonStockMember2019-01-012019-12-310000086312us-gaap:NonredeemablePreferredStockMember2019-12-310000086312us-gaap:NonredeemablePreferredStockMember2019-01-012019-12-310000086312us-gaap:USTreasuryAndGovernmentMember2020-01-012020-12-310000086312us-gaap:USTreasuryAndGovernmentMember2019-01-012019-12-310000086312us-gaap:USTreasuryAndGovernmentMember2018-01-012018-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMember2020-01-012020-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMember2019-01-012019-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMember2018-01-012018-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMember2020-01-012020-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMember2019-01-012019-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMember2018-01-012018-12-310000086312us-gaap:ResidentialMortgageBackedSecuritiesMember2020-01-012020-12-310000086312us-gaap:ResidentialMortgageBackedSecuritiesMember2019-01-012019-12-310000086312us-gaap:ResidentialMortgageBackedSecuritiesMember2018-01-012018-12-310000086312us-gaap:OtherDebtSecuritiesMember2020-01-012020-12-310000086312us-gaap:OtherDebtSecuritiesMember2019-01-012019-12-310000086312us-gaap:OtherDebtSecuritiesMember2018-01-012018-12-310000086312us-gaap:RedeemablePreferredStockMember2020-01-012020-12-310000086312us-gaap:RedeemablePreferredStockMember2019-01-012019-12-310000086312us-gaap:RedeemablePreferredStockMember2018-01-012018-12-310000086312us-gaap:ResidentialMortgageBackedSecuritiesMember2018-12-310000086312us-gaap:OtherDebtSecuritiesMember2018-12-310000086312us-gaap:ResidentialMortgageBackedSecuritiesMember2019-01-012019-12-310000086312us-gaap:OtherDebtSecuritiesMember2019-01-012019-12-310000086312us-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310000086312us-gaap:OtherDebtSecuritiesMember2019-12-310000086312srt:MinimumMemberus-gaap:USTreasuryAndGovernmentMemberus-gaap:CreditConcentrationRiskMemberus-gaap:StockholdersEquityTotalMember2019-01-012019-12-310000086312srt:MinimumMemberus-gaap:USTreasuryAndGovernmentMemberus-gaap:CreditConcentrationRiskMemberus-gaap:StockholdersEquityTotalMember2020-01-012020-12-310000086312us-gaap:ExternalCreditRatingNonInvestmentGradeMember2020-12-310000086312us-gaap:ExternalCreditRatingNonInvestmentGradeMember2019-12-310000086312us-gaap:DebtSecuritiesMember2020-01-012020-12-310000086312us-gaap:DebtSecuritiesMember2019-01-012019-12-310000086312us-gaap:DebtSecuritiesMember2018-01-012018-12-310000086312us-gaap:EquitySecuritiesMember2020-01-012020-12-310000086312us-gaap:EquitySecuritiesMember2019-01-012019-12-310000086312us-gaap:EquitySecuritiesMember2018-01-012018-12-310000086312us-gaap:ShortTermInvestmentsMember2020-01-012020-12-310000086312us-gaap:ShortTermInvestmentsMember2019-01-012019-12-310000086312us-gaap:ShortTermInvestmentsMember2018-01-012018-12-310000086312us-gaap:RealEstateInvestmentMember2020-01-012020-12-310000086312us-gaap:RealEstateInvestmentMember2019-01-012019-12-310000086312us-gaap:RealEstateInvestmentMember2018-01-012018-12-310000086312us-gaap:OtherInvestmentsMember2020-01-012020-12-310000086312us-gaap:OtherInvestmentsMember2019-01-012019-12-310000086312us-gaap:OtherInvestmentsMember2018-01-012018-12-310000086312us-gaap:DebtSecuritiesMembertrv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMember2020-01-012020-12-310000086312us-gaap:DebtSecuritiesMembertrv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMember2019-01-012019-12-310000086312us-gaap:DebtSecuritiesMembertrv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMember2018-01-012018-12-310000086312trv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMemberus-gaap:OtherInvestmentsMember2020-01-012020-12-310000086312trv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMemberus-gaap:OtherInvestmentsMember2019-01-012019-12-310000086312trv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMemberus-gaap:OtherInvestmentsMember2018-01-012018-12-310000086312trv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMember2020-01-012020-12-310000086312trv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMember2019-01-012019-12-310000086312trv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMember2018-01-012018-12-310000086312srt:CumulativeEffectPeriodOfAdoptionAdjustmentMembertrv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMember2017-12-310000086312trv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMember2019-12-310000086312trv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMember2018-12-310000086312trv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMember2017-12-310000086312trv:AccumulatedNetUnrealizedInvestmentGainLossAndOtherThanTemporaryImpairmentMember2020-12-310000086312us-gaap:InterestRateContractMemberus-gaap:FutureMember2020-12-310000086312us-gaap:InterestRateContractMemberus-gaap:FutureMember2019-12-310000086312trv:InvestmentsInVariousPubliclyTradedSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312trv:InvestmentsInVariousPubliclyTradedSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMembertrv:InvestmentsInVariousNonpublicCommonAndPreferredEquitySecuritiesMember2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMembertrv:InvestmentsInVariousNonpublicCommonAndPreferredEquitySecuritiesMember2019-12-310000086312us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherDebtSecuritiesMember2020-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherDebtSecuritiesMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherDebtSecuritiesMember2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherDebtSecuritiesMember2020-12-310000086312us-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:DebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommonStockMember2020-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommonStockMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommonStockMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommonStockMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:NonredeemablePreferredStockMember2020-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NonredeemablePreferredStockMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:NonredeemablePreferredStockMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NonredeemablePreferredStockMember2020-12-310000086312us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000086312us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherDebtSecuritiesMember2019-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherDebtSecuritiesMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherDebtSecuritiesMember2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherDebtSecuritiesMember2019-12-310000086312us-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:DebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommonStockMember2019-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommonStockMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommonStockMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommonStockMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:NonredeemablePreferredStockMember2019-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NonredeemablePreferredStockMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:NonredeemablePreferredStockMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:NonredeemablePreferredStockMember2019-12-310000086312us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2019-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherInvestmentsMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2019-12-310000086312us-gaap:DebtSecuritiesMember2019-12-310000086312us-gaap:OtherInvestmentsMember2019-12-310000086312us-gaap:DebtSecuritiesMember2020-12-310000086312us-gaap:OtherInvestmentsMember2020-12-310000086312us-gaap:DebtSecuritiesMember2018-12-310000086312us-gaap:OtherInvestmentsMember2018-12-310000086312us-gaap:CarryingReportedAmountFairValueDisclosureMember2020-12-310000086312us-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000086312us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-12-310000086312us-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310000086312us-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000086312us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000086312us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310000086312srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310000086312trv:CreditRatingAMBestProvidedRatingMemberus-gaap:ReinsurerConcentrationRiskMembertrv:RatedByAMBestMembertrv:ReinsuranceRecoverablesAfterDeductionOfMandatoryPoolsAndAssociationsBeforeAllowanceMember2020-12-310000086312trv:CreditRatingAMBestProvidedRatingMemberus-gaap:ReinsurerConcentrationRiskMembertrv:RatedByAMBestMembertrv:ReinsuranceRecoverablesAfterDeductionOfMandatoryPoolsAndAssociationsBeforeAllowanceMember2020-01-012020-12-310000086312us-gaap:ReinsurerConcentrationRiskMembertrv:RatedByAMBestMembertrv:AMBestAMinusRatingOrBetterMembertrv:ReinsuranceRecoverablesAfterDeductionOfMandatoryPoolsAndAssociationsBeforeAllowanceRatedByAMBestMember2020-01-012020-12-310000086312trv:NotRatedByAMBestMemberus-gaap:ReinsurerConcentrationRiskMembertrv:ReinsuranceRecoverablesAfterDeductionOfMandatoryPoolsAndAssociationsBeforeAllowanceMember2020-01-012020-12-310000086312trv:CaptiveInsuranceCompaniesMemberus-gaap:ReinsurerConcentrationRiskMembertrv:ReinsuranceRecoverablesAfterDeductionOfMandatoryPoolsAndAssociationsBeforeAllowanceMember2020-01-012020-12-310000086312us-gaap:ReinsurerConcentrationRiskMembertrv:VoluntaryPoolsMembertrv:ReinsuranceRecoverablesAfterDeductionOfMandatoryPoolsAndAssociationsBeforeAllowanceMember2020-01-012020-12-310000086312us-gaap:ReinsurerConcentrationRiskMembertrv:OtherCompaniesNotRatedByAMBestMembertrv:ReinsuranceRecoverablesAfterDeductionOfMandatoryPoolsAndAssociationsBeforeAllowanceMember2020-01-012020-12-310000086312us-gaap:CustomerRelatedIntangibleAssetsMember2020-12-310000086312us-gaap:ContractBasedIntangibleAssetsMember2020-12-310000086312us-gaap:CustomerRelatedIntangibleAssetsMember2019-12-310000086312us-gaap:ContractBasedIntangibleAssetsMember2019-12-310000086312us-gaap:InsuranceContractsAcquiredInBusinessCombinationMember2020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2019-12-310000086312us-gaap:AccidentAndHealthInsuranceExcludingWorkersCompensationMember2020-12-310000086312us-gaap:AccidentAndHealthInsuranceExcludingWorkersCompensationMember2019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2018-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2017-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2019-12-310000086312srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2020-01-012020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2019-01-012019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2018-01-012018-12-310000086312srt:MinimumMemberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2019-01-012019-12-310000086312srt:MinimumMemberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2020-01-012020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembersrt:MaximumMember2019-01-012019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembersrt:MaximumMember2020-01-012020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembertrv:BusinessAndInternationalInsuranceMember2020-01-012020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:AsbestosIssueMember2020-01-012020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembertrv:BondAndSpecialtyInsuranceMember2020-01-012020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembertrv:PersonalInsuranceMember2020-01-012020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembertrv:BusinessAndInternationalInsuranceMember2019-01-012019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:AsbestosIssueMember2019-01-012019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMemberus-gaap:EnvironmentalIssueMembertrv:BusinessAndInternationalInsuranceMember2019-01-012019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembertrv:BondAndSpecialtyInsuranceMember2019-01-012019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembertrv:PersonalInsuranceMember2019-01-012019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembertrv:BusinessAndInternationalInsuranceMember2018-01-012018-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:AsbestosIssueMember2018-01-012018-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMemberus-gaap:EnvironmentalIssueMembertrv:BusinessAndInternationalInsuranceMember2018-01-012018-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembertrv:BondAndSpecialtyInsuranceMember2018-01-012018-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembertrv:PersonalInsuranceMember2018-01-012018-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2020-12-310000086312trv:AutomobileMemberus-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312us-gaap:OperatingSegmentsMembertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312us-gaap:OperatingSegmentsMemberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2020-12-310000086312trv:AutomobileMemberus-gaap:OperatingSegmentsMembertrv:PersonalInsuranceMember2020-12-310000086312us-gaap:OperatingSegmentsMembertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2020-12-310000086312us-gaap:OperatingSegmentsMembercountry:CAtrv:PersonalInsuranceMember2020-12-310000086312us-gaap:OperatingSegmentsMemberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMember2020-12-310000086312trv:OtherInsuranceContractsMemberus-gaap:MaterialReconcilingItemsMember2020-12-310000086312us-gaap:MaterialReconcilingItemsMembertrv:UnallocatedLossAdjustmentExpenseReserveMember2020-12-310000086312us-gaap:MaterialReconcilingItemsMemberus-gaap:StructuredSettlementAnnuityMember2020-12-310000086312us-gaap:MaterialReconcilingItemsMembertrv:OtherIncludingImpactsOfRetroactiveReinsuranceMember2020-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2011-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2012-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2013-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2014-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2015-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2016-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2017-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2018-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2019-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2020-12-31trv:claims0000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2012-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2013-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2014-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2015-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2020-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMember2013-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMember2014-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMember2015-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMember2016-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMember2017-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMember2018-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMember2019-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMember2020-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2015-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2017-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2018-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2018-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2020-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2019-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2020-12-310000086312us-gaap:ShortDurationInsuranceContractAccidentYear2020Membertrv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2020-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:GeneralLiabilityMember2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2017-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2018-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2018-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2020-12-310000086312trv:BusinessAndInternationalInsuranceMembertrv:PropertyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2019-12-310000086312trv:BusinessAndInternationalInsuranceMembertrv:PropertyMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2020-12-310000086312us-gaap:ShortDurationInsuranceContractAccidentYear2020Membertrv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2020-12-310000086312trv:BusinessAndInternationalInsuranceMembertrv:PropertyMember2020-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:CommercialMultiPerilMember2011-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:CommercialMultiPerilMember2012-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:CommercialMultiPerilMember2013-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:CommercialMultiPerilMember2014-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:CommercialMultiPerilMember2015-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:CommercialMultiPerilMember2016-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:CommercialMultiPerilMember2017-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:CommercialMultiPerilMember2018-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:CommercialMultiPerilMember2019-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:CommercialMultiPerilMember2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2012-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2013-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2014-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2015-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2020-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:CommercialMultiPerilMember2013-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:CommercialMultiPerilMember2014-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:CommercialMultiPerilMember2015-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:CommercialMultiPerilMember2016-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:CommercialMultiPerilMember2017-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:CommercialMultiPerilMember2018-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:CommercialMultiPerilMember2019-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:CommercialMultiPerilMember2020-12-310000086312trv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310000086312trv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310000086312trv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310000086312trv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310000086312trv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310000086312trv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310000086312trv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2015-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2017-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2018-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2018-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2020-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membertrv:CommercialMultiPerilMember2019-12-310000086312trv:BusinessAndInternationalInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membertrv:CommercialMultiPerilMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractAccidentYear2020Membertrv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2020-12-310000086312trv:BusinessAndInternationalInsuranceMembertrv:CommercialMultiPerilMember2020-12-310000086312trv:AutomobileMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMember2016-12-310000086312trv:AutomobileMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMember2017-12-310000086312trv:AutomobileMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMember2018-12-310000086312trv:AutomobileMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMember2019-12-310000086312trv:AutomobileMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMember2017-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMember2018-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMember2019-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMember2018-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMember2019-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312trv:AutomobileMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2019-12-310000086312trv:AutomobileMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2020-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Membertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312trv:AutomobileMembertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2011-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2012-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2013-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2014-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2015-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2016-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2017-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2018-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2019-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Member2020-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMember2012-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMember2013-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMember2014-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMember2015-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMember2016-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMember2017-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMember2018-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMember2019-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2013-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2014-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2015-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2016-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2017-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2018-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2019-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2013Member2020-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2015-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Membertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMember2017-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMember2018-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMember2019-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMember2018-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMember2019-12-310000086312trv:WorkersCompensationMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2019-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Member2020-12-310000086312us-gaap:ShortDurationInsuranceContractAccidentYear2020Membertrv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312trv:WorkersCompensationMembertrv:BusinessAndInternationalInsuranceMember2020-12-310000086312us-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:BondAndSpecialtyInsuranceMember2011-12-310000086312us-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:BondAndSpecialtyInsuranceMember2012-12-310000086312us-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:BondAndSpecialtyInsuranceMember2013-12-310000086312us-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:BondAndSpecialtyInsuranceMember2014-12-310000086312us-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:BondAndSpecialtyInsuranceMember2015-12-310000086312us-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:BondAndSpecialtyInsuranceMember2016-12-310000086312us-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:BondAndSpecialtyInsuranceMember2017-12-310000086312us-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:BondAndSpecialtyInsuranceMember2018-12-310000086312us-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:BondAndSpecialtyInsuranceMember2019-12-310000086312us-gaap:GeneralLiabilityMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:BondAndSpecialtyInsuranceMember2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2012-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2013-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2014-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2015-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2012Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2013-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2014-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2015-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2013Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2020-12-310000086312us-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310000086312us-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310000086312us-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310000086312us-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310000086312us-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310000086312us-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310000086312us-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2015-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2017-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2018-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2018-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2020-12-310000086312us-gaap:GeneralLiabilityMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membertrv:BondAndSpecialtyInsuranceMember2019-12-310000086312us-gaap:GeneralLiabilityMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membertrv:BondAndSpecialtyInsuranceMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractAccidentYear2020Memberus-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2020-12-310000086312us-gaap:GeneralLiabilityMembertrv:BondAndSpecialtyInsuranceMember2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2017-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2018-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2018-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractAccidentYear2019Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractAccidentYear2019Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractAccidentYear2020Membertrv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2020-12-310000086312trv:BondAndSpecialtyInsuranceMembertrv:FidelityAndSuretyMember2020-12-310000086312trv:AutomobileMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:PersonalInsuranceMember2016-12-310000086312trv:AutomobileMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:PersonalInsuranceMember2017-12-310000086312trv:AutomobileMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:PersonalInsuranceMember2018-12-310000086312trv:AutomobileMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:PersonalInsuranceMember2019-12-310000086312trv:AutomobileMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:PersonalInsuranceMember2020-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:PersonalInsuranceMember2017-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:PersonalInsuranceMember2018-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:PersonalInsuranceMember2019-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:PersonalInsuranceMember2020-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:PersonalInsuranceMember2018-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:PersonalInsuranceMember2019-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:PersonalInsuranceMember2020-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membertrv:PersonalInsuranceMember2019-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractAccidentYear2019Membertrv:PersonalInsuranceMember2020-12-310000086312trv:AutomobileMemberus-gaap:ShortDurationInsuranceContractAccidentYear2020Membertrv:PersonalInsuranceMember2020-12-310000086312trv:AutomobileMembertrv:PersonalInsuranceMember2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2017-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2018-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2018-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractAccidentYear2019Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2019-12-310000086312us-gaap:ShortDurationInsuranceContractAccidentYear2019Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractAccidentYear2020Membertrv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2020-12-310000086312trv:PersonalInsuranceMemberus-gaap:PropertyAndCasualtyPersonalInsuranceProductLineMember2020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:PersonalInsuranceMember2011-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:PersonalInsuranceMember2012-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:PersonalInsuranceMember2013-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:PersonalInsuranceMember2014-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:PersonalInsuranceMember2015-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:PersonalInsuranceMember2016-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:PersonalInsuranceMember2017-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:PersonalInsuranceMember2018-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:PersonalInsuranceMember2019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2011Membertrv:PersonalInsuranceMember2020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:PersonalInsuranceMember2012-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:PersonalInsuranceMember2013-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:PersonalInsuranceMember2014-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:PersonalInsuranceMember2015-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:PersonalInsuranceMember2016-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:PersonalInsuranceMember2017-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:PersonalInsuranceMember2018-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:PersonalInsuranceMember2019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2012Membertrv:PersonalInsuranceMember2020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:PersonalInsuranceMember2013-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:PersonalInsuranceMember2014-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:PersonalInsuranceMember2015-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:PersonalInsuranceMember2016-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:PersonalInsuranceMember2017-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:PersonalInsuranceMember2018-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:PersonalInsuranceMember2019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortdurationInsuranceContractsAccidentYear2013Membertrv:PersonalInsuranceMember2020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2014-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2015-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2016-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2017-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2018-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMemberus-gaap:ShortdurationInsuranceContractsAccidentYear2014Member2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2015-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2015Memberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2020-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2016-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2017-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2018-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2019-12-310000086312us-gaap:ShortdurationInsuranceContractsAccidentYear2016Memberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:PersonalInsuranceMember2017-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:PersonalInsuranceMember2018-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:PersonalInsuranceMember2019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortDurationInsuranceContractsAccidentYear2017Membertrv:PersonalInsuranceMember2020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:PersonalInsuranceMember2018-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:PersonalInsuranceMember2019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortDurationInsuranceContractsAccidentYear2018Membertrv:PersonalInsuranceMember2020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortDurationInsuranceContractAccidentYear2019Membertrv:PersonalInsuranceMember2019-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAus-gaap:ShortDurationInsuranceContractAccidentYear2019Membertrv:PersonalInsuranceMember2020-12-310000086312us-gaap:ShortDurationInsuranceContractAccidentYear2020Memberus-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2020-12-310000086312us-gaap:PropertyLiabilityAndCasualtyInsuranceSegmentMembercountry:CAtrv:PersonalInsuranceMember2020-12-310000086312us-gaap:AsbestosIssueMember2020-01-012020-12-310000086312us-gaap:AsbestosIssueMember2019-01-012019-12-310000086312us-gaap:AsbestosIssueMember2018-01-012018-12-310000086312us-gaap:EnvironmentalIssueMember2020-01-012020-12-310000086312us-gaap:EnvironmentalIssueMember2019-01-012019-12-310000086312us-gaap:EnvironmentalIssueMember2018-01-012018-12-310000086312trv:SeniorNotes3.90PercentDueNovember2020Memberus-gaap:SeniorNotesMember2020-12-310000086312trv:SeniorNotes3.90PercentDueNovember2020Memberus-gaap:SeniorNotesMember2019-12-310000086312trv:SeniorNotes7.75PercentDueApril2026Memberus-gaap:SeniorNotesMember2020-12-310000086312trv:SeniorNotes7.75PercentDueApril2026Memberus-gaap:SeniorNotesMember2019-12-310000086312us-gaap:JuniorSubordinatedDebtMembertrv:JuniorSubordinatedDebentures7.625PercentDueDecember2027Member2020-12-310000086312us-gaap:JuniorSubordinatedDebtMembertrv:JuniorSubordinatedDebentures7.625PercentDueDecember2027Member2019-12-310000086312trv:SeniorNotes6.375PercentDueMarch2033Memberus-gaap:SeniorNotesMember2020-12-310000086312trv:SeniorNotes6.375PercentDueMarch2033Memberus-gaap:SeniorNotesMember2019-12-310000086312trv:SeniorNotes6.75PercentDueJune2036Memberus-gaap:SeniorNotesMember2020-12-310000086312trv:SeniorNotes6.75PercentDueJune2036Memberus-gaap:SeniorNotesMember2019-12-310000086312trv:SeniorNotes6.25PercentDueJune2037Memberus-gaap:SeniorNotesMember2020-12-310000086312trv:SeniorNotes6.25PercentDueJune2037Memberus-gaap:SeniorNotesMember2019-12-310000086312us-gaap:SeniorNotesMembertrv:SeniorNotes5.35PercentDueNovember2040Member2020-12-310000086312us-gaap:SeniorNotesMembertrv:SeniorNotes5.35PercentDueNovember2040Member2019-12-310000086312trv:SeniorNotes4.60PercentDueAugust2043Memberus-gaap:SeniorNotesMember2020-12-310000086312trv:SeniorNotes4.60PercentDueAugust2043Memberus-gaap:SeniorNotesMember2019-12-310000086312trv:SeniorNotes4.30PercentDueAugust2045Memberus-gaap:SeniorNotesMember2020-12-310000086312trv:SeniorNotes4.30PercentDueAugust2045Memberus-gaap:SeniorNotesMember2019-12-310000086312trv:JuniorSubordinatedDebentures8.50PercentDueDecember2045Memberus-gaap:JuniorSubordinatedDebtMember2020-12-310000086312trv:JuniorSubordinatedDebentures8.50PercentDueDecember2045Memberus-gaap:JuniorSubordinatedDebtMember2019-12-310000086312trv:SeniorNotes3.75PercentDueMay2046Memberus-gaap:SeniorNotesMember2019-12-310000086312trv:SeniorNotes3.75PercentDueMay2046Memberus-gaap:SeniorNotesMember2020-12-310000086312trv:JuniorSubordinatedDebentures8.312PercentDueJuly2046Memberus-gaap:JuniorSubordinatedDebtMember2020-12-310000086312trv:JuniorSubordinatedDebentures8.312PercentDueJuly2046Memberus-gaap:JuniorSubordinatedDebtMember2019-12-310000086312us-gaap:SeniorNotesMembertrv:SeniorNotes4.00PercentDueMay2047Member2019-12-310000086312us-gaap:SeniorNotesMembertrv:SeniorNotes4.00PercentDueMay2047Member2020-12-310000086312trv:SeniorNotes4.05DueMarch72048Memberus-gaap:SeniorNotesMember2020-12-310000086312trv:SeniorNotes4.05DueMarch72048Memberus-gaap:SeniorNotesMember2019-12-310000086312trv:SeniorNotes4.10DueMarch2049Memberus-gaap:SeniorNotesMember2020-12-310000086312trv:SeniorNotes4.10DueMarch2049Memberus-gaap:SeniorNotesMember2019-12-310000086312trv:SeniorNotes255DueApril2050Memberus-gaap:SeniorNotesMember2020-12-310000086312trv:SeniorNotes255DueApril2050Memberus-gaap:SeniorNotesMember2020-04-270000086312trv:SeniorNotes255DueApril2050Memberus-gaap:SeniorNotesMember2020-04-272020-04-270000086312trv:SeniorNotes3.90PercentDueNovember2020Memberus-gaap:SeniorNotesMember2020-11-012020-11-010000086312trv:SeniorNotes3.90PercentDueNovember2020Memberus-gaap:SeniorNotesMember2020-11-010000086312trv:SeniorNotes4.10DueMarch2049Memberus-gaap:SeniorNotesMember2019-03-040000086312trv:SeniorNotes4.10DueMarch2049Memberus-gaap:SeniorNotesMember2019-03-042019-03-040000086312trv:SeniorNotes5.90PercentDueJune2019Memberus-gaap:SeniorNotesMember2019-06-022019-06-020000086312trv:SeniorNotes5.90PercentDueJune2019Memberus-gaap:SeniorNotesMember2019-06-020000086312trv:SeniorNotes4.05DueMarch72048Memberus-gaap:SeniorNotesMember2018-03-070000086312trv:SeniorNotes4.05DueMarch72048Memberus-gaap:SeniorNotesMember2018-03-072018-03-070000086312us-gaap:SeniorNotesMembertrv:SeniorNotes5.80DueMay2018Member2018-05-152018-05-150000086312us-gaap:SeniorNotesMembertrv:SeniorNotes5.80DueMay2018Member2018-05-150000086312us-gaap:CommercialPaperMember2020-12-310000086312us-gaap:CommercialPaperMembersrt:MinimumMember2020-01-012020-12-310000086312us-gaap:CommercialPaperMembersrt:MaximumMember2020-01-012020-12-310000086312us-gaap:CommercialPaperMembersrt:MinimumMember2019-01-012019-12-310000086312us-gaap:CommercialPaperMembersrt:MaximumMember2019-01-012019-12-31trv:debenture_instruments0000086312us-gaap:JuniorSubordinatedDebtMember2020-01-012020-12-31trv:trusts0000086312us-gaap:JuniorSubordinatedDebtMember2019-01-012019-12-310000086312us-gaap:RevolvingCreditFacilityMembertrv:RevolvingCreditAgreementDueToExpireIn2023Member2020-01-012020-12-310000086312us-gaap:RevolvingCreditFacilityMembertrv:RevolvingCreditAgreementDueToExpireIn2023Member2020-12-310000086312srt:MinimumMemberus-gaap:RevolvingCreditFacilityMembertrv:RevolvingCreditAgreementDueToExpireIn2023Member2020-12-310000086312srt:MinimumMemberus-gaap:RevolvingCreditFacilityMembertrv:RevolvingCreditAgreementDueToExpireIn2023Member2020-01-012020-12-310000086312srt:MinimumMemberus-gaap:RevolvingCreditFacilityMemberus-gaap:LondonInterbankOfferedRateLIBORMembertrv:RevolvingCreditAgreementDueToExpireIn2023Member2020-01-012020-12-310000086312us-gaap:RevolvingCreditFacilityMemberus-gaap:LondonInterbankOfferedRateLIBORMembertrv:RevolvingCreditAgreementDueToExpireIn2023Membersrt:MaximumMember2020-01-012020-12-310000086312us-gaap:RevolvingCreditFacilityMemberus-gaap:LondonInterbankOfferedRateLIBORMembertrv:RevolvingCreditAgreementDueToExpireIn2023Member2020-01-012020-12-310000086312us-gaap:RestrictedStockMembertrv:SimplyBusinessMember2020-08-012020-08-3100000863122017-04-300000086312trv:ConnecticutInsuranceDepartmentMembertrv:InsuranceSubsidiariesMember2020-12-31trv:companies0000086312srt:ParentCompanyMember2018-12-310000086312srt:ParentCompanyMember2020-01-012020-12-310000086312srt:ParentCompanyMember2019-01-012019-12-310000086312srt:ParentCompanyMember2018-01-012018-12-310000086312trv:InsuranceSubsidiariesMember2020-01-012020-12-310000086312trv:InsuranceSubsidiariesMember2019-01-012019-12-310000086312trv:InsuranceSubsidiariesMember2018-01-012018-12-310000086312trv:InsuranceSubsidiariesMember2020-12-310000086312trv:InsuranceSubsidiariesMember2019-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2017-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2017-12-310000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2017-12-310000086312us-gaap:AccumulatedTranslationAdjustmentMember2017-12-310000086312trv:CumulativeEffectPeriodOfAdoptionAdjustmentBeforeTaxMemberus-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2017-12-310000086312trv:CumulativeEffectPeriodOfAdoptionAdjustmentBeforeTaxMemberus-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2017-12-310000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMembertrv:CumulativeEffectPeriodOfAdoptionAdjustmentBeforeTaxMember2017-12-310000086312trv:CumulativeEffectPeriodOfAdoptionAdjustmentBeforeTaxMemberus-gaap:AccumulatedTranslationAdjustmentMember2017-12-310000086312trv:CumulativeEffectPeriodOfAdoptionAdjustmentBeforeTaxMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2017-12-310000086312trv:CumulativeEffectPeriodOfAdoptionAdjustmentTaxMemberus-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2017-12-310000086312trv:CumulativeEffectPeriodOfAdoptionAdjustmentTaxMemberus-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2017-12-310000086312trv:CumulativeEffectPeriodOfAdoptionAdjustmentTaxMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2017-12-310000086312trv:CumulativeEffectPeriodOfAdoptionAdjustmentTaxMemberus-gaap:AccumulatedTranslationAdjustmentMember2017-12-310000086312trv:CumulativeEffectPeriodOfAdoptionAdjustmentTaxMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2017-12-310000086312srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2017-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2017-12-310000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMembersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2017-12-310000086312srt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:AccumulatedTranslationAdjustmentMember2017-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2018-01-012018-01-010000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2018-01-012018-01-010000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2018-01-012018-01-010000086312us-gaap:AccumulatedTranslationAdjustmentMember2018-01-012018-01-010000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2018-01-012018-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2018-01-012018-12-310000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2018-01-012018-12-310000086312us-gaap:AccumulatedTranslationAdjustmentMember2018-01-012018-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2018-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2018-12-310000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2018-12-310000086312us-gaap:AccumulatedTranslationAdjustmentMember2018-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2019-01-012019-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2019-01-012019-12-310000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-01-012019-12-310000086312us-gaap:AccumulatedTranslationAdjustmentMember2019-01-012019-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2019-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2019-12-310000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-310000086312us-gaap:AccumulatedTranslationAdjustmentMember2019-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2020-01-012020-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2020-01-012020-12-310000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-01-012020-12-310000086312us-gaap:AccumulatedTranslationAdjustmentMember2020-01-012020-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2020-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember2020-12-310000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310000086312us-gaap:AccumulatedTranslationAdjustmentMember2020-12-310000086312us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2020-01-012020-12-310000086312us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2019-01-012019-12-310000086312us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember2018-01-012018-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310000086312us-gaap:AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310000086312us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310000086312us-gaap:AccumulatedTranslationAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310000086312us-gaap:AccumulatedTranslationAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310000086312us-gaap:AccumulatedTranslationAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310000086312us-gaap:AccumulatedOtherComprehensiveIncomeMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-12-310000086312us-gaap:AccumulatedOtherComprehensiveIncomeMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2019-01-012019-12-310000086312us-gaap:AccumulatedOtherComprehensiveIncomeMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2018-01-012018-12-310000086312country:BRsrt:SubsidiariesMember2020-01-012020-12-310000086312country:IEsrt:SubsidiariesMember2020-01-012020-12-310000086312country:CAsrt:SubsidiariesMember2020-01-012020-12-310000086312us-gaap:InternalRevenueServiceIRSMember2020-12-310000086312us-gaap:CanadaRevenueAgencyMember2020-12-310000086312us-gaap:RevenueCommissionersIrelandMember2020-12-310000086312us-gaap:HerMajestysRevenueAndCustomsHMRCMember2020-12-310000086312trv:TheTravelersCompaniesInc2014StockIncentivePlanMember2020-12-310000086312trv:TheTravelersCompaniesInc2014StockIncentivePlanMember2019-05-012019-05-310000086312trv:TheTravelersCompaniesInc2014StockIncentivePlanMember2017-05-012017-05-310000086312trv:TheTravelersCompaniesInc2014StockIncentivePlanMember2016-05-012016-05-310000086312trv:DirectorDeferredStockAwardMembertrv:TheTravelersCompaniesInc2014StockIncentivePlanMember2020-01-012020-12-310000086312trv:TheTravelersCompaniesInc2014StockIncentivePlanMemberus-gaap:EmployeeStockOptionMember2020-01-012020-12-310000086312us-gaap:EmployeeStockOptionMember2020-01-012020-12-310000086312us-gaap:EmployeeStockOptionMember2019-01-012019-12-310000086312us-gaap:EmployeeStockOptionMember2018-01-012018-12-310000086312srt:MinimumMemberus-gaap:EmployeeStockOptionMember2019-01-012019-12-310000086312srt:MaximumMemberus-gaap:EmployeeStockOptionMember2019-01-012019-12-310000086312us-gaap:EmployeeStockOptionMember2020-12-310000086312srt:MinimumMemberus-gaap:EmployeeStockOptionMember2019-12-310000086312srt:MaximumMemberus-gaap:EmployeeStockOptionMember2019-12-310000086312us-gaap:EmployeeStockOptionMember2018-12-310000086312trv:TheTravelersCompaniesInc2014StockIncentivePlanMemberus-gaap:SubsequentEventMemberus-gaap:EmployeeStockOptionMember2021-02-022021-02-020000086312trv:RestrictedStockUnitsMember2020-01-012020-12-310000086312us-gaap:PerformanceSharesMember2020-01-012020-12-310000086312us-gaap:PerformanceSharesMembertrv:AwardsFebruary2019And2020Membersrt:MinimumMember2020-01-012020-12-310000086312us-gaap:PerformanceSharesMembertrv:AwardsFebruary2019And2020Membersrt:MaximumMember2020-01-012020-12-310000086312us-gaap:PerformanceSharesMembersrt:MinimumMembertrv:AwardsFebruary2021Member2020-01-012020-12-310000086312us-gaap:PerformanceSharesMembertrv:AwardsFebruary2021Membersrt:MaximumMember2020-01-012020-12-310000086312trv:RestrictedStockUnitsDeferredStockUnitsAndPerformanceSharesMember2020-01-012020-12-310000086312trv:RestrictedStockUnitsDeferredStockUnitsAndPerformanceSharesMember2019-01-012019-12-310000086312trv:RestrictedStockUnitsDeferredStockUnitsAndPerformanceSharesMember2018-01-012018-12-310000086312trv:RestrictedStockUnitsAndDeferredStockUnitsMember2019-12-310000086312us-gaap:PerformanceSharesMember2019-12-310000086312trv:RestrictedStockUnitsAndDeferredStockUnitsMember2020-01-012020-12-310000086312trv:RestrictedStockUnitsAndDeferredStockUnitsMember2020-12-310000086312us-gaap:PerformanceSharesMember2020-12-310000086312trv:RestrictedStockUnitsDeferredStockUnitsAndPerformanceSharesMemberus-gaap:SubsequentEventMember2021-02-022021-02-020000086312trv:RestrictedStockUnitsAndDeferredStockUnitsMemberus-gaap:SubsequentEventMember2021-02-022021-02-020000086312us-gaap:PerformanceSharesMemberus-gaap:SubsequentEventMember2021-02-022021-02-020000086312srt:MinimumMember2020-01-012020-12-310000086312srt:MaximumMember2020-01-012020-12-310000086312us-gaap:PerformanceSharesMember2019-01-012019-12-310000086312us-gaap:PerformanceSharesMember2018-01-012018-12-310000086312us-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2019-12-310000086312us-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2018-12-310000086312us-gaap:OtherPensionPlansDefinedBenefitMember2019-12-310000086312us-gaap:OtherPensionPlansDefinedBenefitMember2018-12-310000086312us-gaap:PensionPlansDefinedBenefitMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMember2018-12-310000086312us-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-01-012020-12-310000086312us-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2019-01-012019-12-310000086312us-gaap:OtherPensionPlansDefinedBenefitMember2020-01-012020-12-310000086312us-gaap:OtherPensionPlansDefinedBenefitMember2019-01-012019-12-310000086312us-gaap:PensionPlansDefinedBenefitMember2020-01-012020-12-310000086312us-gaap:PensionPlansDefinedBenefitMember2019-01-012019-12-310000086312us-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000086312us-gaap:OtherPensionPlansDefinedBenefitMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMember2020-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2018-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310000086312us-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2018-01-012018-12-310000086312us-gaap:PensionPlansDefinedBenefitMember2018-01-012018-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2018-01-012018-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:InvestmentIncomeMember2020-01-012020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:InvestmentIncomeMember2019-01-012019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:InvestmentIncomeMember2018-01-012018-12-310000086312us-gaap:InvestmentIncomeMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310000086312us-gaap:InvestmentIncomeMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310000086312us-gaap:InvestmentIncomeMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2018-01-012018-12-310000086312us-gaap:PensionPlansDefinedBenefitMembertrv:PolicyholderBenefitsAndClaimsIncurredNetMember2020-01-012020-12-310000086312us-gaap:PensionPlansDefinedBenefitMembertrv:PolicyholderBenefitsAndClaimsIncurredNetMember2019-01-012019-12-310000086312us-gaap:PensionPlansDefinedBenefitMembertrv:PolicyholderBenefitsAndClaimsIncurredNetMember2018-01-012018-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembertrv:PolicyholderBenefitsAndClaimsIncurredNetMember2020-01-012020-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembertrv:PolicyholderBenefitsAndClaimsIncurredNetMember2019-01-012019-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembertrv:PolicyholderBenefitsAndClaimsIncurredNetMember2018-01-012018-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2020-01-012020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2019-01-012019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2018-01-012018-12-310000086312us-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310000086312us-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310000086312us-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2018-01-012018-12-310000086312us-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:NonqualifiedPlanMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:NonqualifiedPlanMember2019-12-310000086312country:USus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310000086312country:USus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMembercountry:US2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:NonqualifiedPlanMember2020-01-012020-12-310000086312us-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:NonqualifiedPlanMember2019-01-012019-12-310000086312country:USus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-12-310000086312country:USus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2019-01-012019-12-310000086312us-gaap:PensionPlansDefinedBenefitMembercountry:US2020-01-012020-12-310000086312us-gaap:PensionPlansDefinedBenefitMembercountry:US2019-01-012019-12-310000086312country:UStrv:PostretirementBenefitPlanBeforeAge65Member2020-12-310000086312country:UStrv:PostretirementBenefitPlanBeforeAge65Member2019-12-310000086312trv:PostretirementBenefitPlanAge65AndOlderMembercountry:US2020-12-310000086312trv:PostretirementBenefitPlanAge65AndOlderMembercountry:US2019-12-310000086312country:UStrv:PostretirementBenefitPlanBeforeAge65Member2020-01-012020-12-310000086312country:UStrv:PostretirementBenefitPlanBeforeAge65Member2019-01-012019-12-310000086312trv:PostretirementBenefitPlanAge65AndOlderMembercountry:US2020-01-012020-12-310000086312trv:PostretirementBenefitPlanAge65AndOlderMembercountry:US2019-01-012019-12-310000086312srt:MinimumMemberus-gaap:QualifiedPlanMembertrv:InvestmentsForLongTermGrowthMemberus-gaap:PensionPlansDefinedBenefitMembercountry:US2020-12-310000086312us-gaap:QualifiedPlanMembertrv:InvestmentsForLongTermGrowthMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USsrt:MaximumMember2020-12-310000086312srt:MinimumMemberus-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMembercountry:UStrv:InvestmentsForNearTermBenefitPaymentsMember2020-12-310000086312us-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMembercountry:UStrv:InvestmentsForNearTermBenefitPaymentsMembersrt:MaximumMember2020-12-310000086312srt:MinimumMemberus-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:DefinedBenefitPlanEquitySecuritiesMember2020-12-310000086312us-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:DefinedBenefitPlanEquitySecuritiesMembersrt:MaximumMember2020-12-310000086312srt:MinimumMemberus-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310000086312us-gaap:QualifiedPlanMemberus-gaap:PensionPlansDefinedBenefitMembercountry:USsrt:MaximumMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2020-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherDebtSecuritiesMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherDebtSecuritiesMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherDebtSecuritiesMember2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherDebtSecuritiesMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EquityFundsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EquityFundsMember2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:EquityFundsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FixedIncomeFundsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FixedIncomeFundsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FixedIncomeFundsMember2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FixedIncomeFundsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:MutualFundMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:MutualFundMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:MutualFundMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:MutualFundMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:MoneyMarketFundsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:MoneyMarketFundsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:MoneyMarketFundsMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:MoneyMarketFundsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMembertrv:CashAndShortTermSecuritiesOtherMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membertrv:CashAndShortTermSecuritiesOtherMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membertrv:CashAndShortTermSecuritiesOtherMember2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMembertrv:CashAndShortTermSecuritiesOtherMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMembertrv:CashAndShortTermInvestmentsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membertrv:CashAndShortTermInvestmentsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membertrv:CashAndShortTermInvestmentsMember2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMembertrv:CashAndShortTermInvestmentsMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2020-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMember2019-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2019-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:ResidentialMortgageBackedSecuritiesMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherDebtSecuritiesMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherDebtSecuritiesMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherDebtSecuritiesMember2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherDebtSecuritiesMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanDebtSecurityMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:DefinedBenefitPlanDebtSecurityMember2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:EquityFundsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EquityFundsMember2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:EquityFundsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FixedIncomeFundsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FixedIncomeFundsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FixedIncomeFundsMember2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:FixedIncomeFundsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:MutualFundMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:MutualFundMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:MutualFundMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:MutualFundMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanEquitySecuritiesMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherInvestmentsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:OtherInvestmentsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:MoneyMarketFundsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Memberus-gaap:MoneyMarketFundsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:MoneyMarketFundsMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMemberus-gaap:MoneyMarketFundsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMembertrv:CashAndShortTermSecuritiesOtherMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membertrv:CashAndShortTermSecuritiesOtherMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membertrv:CashAndShortTermSecuritiesOtherMember2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMembertrv:CashAndShortTermSecuritiesOtherMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMembertrv:CashAndShortTermInvestmentsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Membertrv:CashAndShortTermInvestmentsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Membertrv:CashAndShortTermInvestmentsMember2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMembertrv:CashAndShortTermInvestmentsMember2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel1Member2019-12-310000086312us-gaap:PensionPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312us-gaap:FairValueInputsLevel3Memberus-gaap:PensionPlansDefinedBenefitMember2019-12-310000086312srt:MinimumMembertrv:InvestmentsForLongTermGrowthMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-12-310000086312trv:InvestmentsForLongTermGrowthMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MaximumMember2020-12-310000086312srt:MinimumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembertrv:InvestmentsForNearTermBenefitPaymentsMember2020-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembertrv:InvestmentsForNearTermBenefitPaymentsMembersrt:MaximumMember2020-12-310000086312srt:MinimumMemberus-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMembersrt:MaximumMemberus-gaap:DefinedBenefitPlanDebtSecurityMember2020-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2020-12-310000086312us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMemberus-gaap:FairValueInputsLevel2Member2019-12-310000086312trv:TheTravelers401kSavingsPlanMembersrt:MaximumMember2020-01-012020-12-310000086312trv:TheTravelers401kSavingsPlanMember2020-01-012020-12-310000086312us-gaap:IndemnificationGuaranteeMember2020-12-310000086312trv:PaymentGuaranteeCertainInsurancePolicyObligationsMember2020-12-3100000863122020-01-012020-03-3100000863122020-04-012020-06-3000000863122020-07-012020-09-3000000863122020-10-012020-12-3100000863122019-01-012019-03-3100000863122019-04-012019-06-3000000863122019-07-012019-09-3000000863122019-10-012019-12-310000086312srt:ParentCompanyMember2017-12-310000086312trv:SeniorNotes7.75PercentDueApril2026Memberus-gaap:PaymentGuaranteeMembersrt:ParentCompanyMemberus-gaap:SeniorNotesMember2020-12-310000086312trv:SeniorNotes6.375PercentDueMarch2033Memberus-gaap:PaymentGuaranteeMembersrt:ParentCompanyMemberus-gaap:SeniorNotesMember2020-12-310000086312us-gaap:OperatingSegmentsMembertrv:BusinessAndInternationalInsuranceMember2018-12-310000086312us-gaap:OperatingSegmentsMembertrv:BondAndSpecialtyInsuranceMember2018-12-310000086312us-gaap:OperatingSegmentsMembertrv:PersonalInsuranceMember2018-12-310000086312us-gaap:OperatingSegmentsMember2018-12-310000086312trv:CorporateAndReconcilingItemsMember2018-12-310000086312us-gaap:AllowanceForReinsuranceRecoverableMember2019-12-310000086312us-gaap:AllowanceForReinsuranceRecoverableMember2020-01-012020-12-310000086312us-gaap:AllowanceForReinsuranceRecoverableMember2020-12-310000086312us-gaap:AllowanceForUncollectiblePremiumsReceivableMember2019-12-310000086312us-gaap:AllowanceForUncollectiblePremiumsReceivableMember2020-01-012020-12-310000086312us-gaap:AllowanceForUncollectiblePremiumsReceivableMember2020-12-310000086312us-gaap:AllowanceForUncollectibleDeductiblesMember2019-12-310000086312us-gaap:AllowanceForUncollectibleDeductiblesMember2020-01-012020-12-310000086312us-gaap:AllowanceForUncollectibleDeductiblesMember2020-12-310000086312us-gaap:AllowanceForReinsuranceRecoverableMember2018-12-310000086312us-gaap:AllowanceForReinsuranceRecoverableMember2019-01-012019-12-310000086312us-gaap:AllowanceForUncollectiblePremiumsReceivableMember2018-12-310000086312us-gaap:AllowanceForUncollectiblePremiumsReceivableMember2019-01-012019-12-310000086312us-gaap:AllowanceForUncollectibleDeductiblesMember2018-12-310000086312us-gaap:AllowanceForUncollectibleDeductiblesMember2019-01-012019-12-310000086312us-gaap:AllowanceForReinsuranceRecoverableMember2017-12-310000086312us-gaap:AllowanceForReinsuranceRecoverableMember2018-01-012018-12-310000086312us-gaap:AllowanceForUncollectiblePremiumsReceivableMember2017-12-310000086312us-gaap:AllowanceForUncollectiblePremiumsReceivableMember2018-01-012018-12-310000086312us-gaap:AllowanceForUncollectibleDeductiblesMember2017-12-310000086312us-gaap:AllowanceForUncollectibleDeductiblesMember2018-01-012018-12-310000086312srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember2020-01-010000086312srt:ConsolidatedPropertyAndCasualtyInsuranceEntityMember2020-12-310000086312srt:ConsolidatedPropertyAndCasualtyInsuranceEntityMember2020-01-012020-12-310000086312srt:ConsolidatedPropertyAndCasualtyInsuranceEntityMember2019-12-310000086312srt:ConsolidatedPropertyAndCasualtyInsuranceEntityMember2019-01-012019-12-310000086312srt:ConsolidatedPropertyAndCasualtyInsuranceEntityMember2018-12-310000086312srt:ConsolidatedPropertyAndCasualtyInsuranceEntityMember2018-01-012018-12-31

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

__________________________________________________________________________

FORM 10-K

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

For the fiscal year ended December 31, 2020

or

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

For the transition period from __________to__________

________________________________________________

Commission file number 001-10898

________________________________________________

______________________________________________________________________________

485 Lexington Avenue

New York, NY 10017

(Address of principal executive offices) (Zip code)

 (917) 778-6000

(Registrant’s telephone number, including area code)

______________________________________________________________________________

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common stock, without par value

TRV

New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:            None

Indicate by check mark if the registrant is a well-known seasoned issuer (as defined in Rule 405 of the Securities Act). Yes x No ¨ 

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ☐ No x 

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

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

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

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

Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒

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

As of June 30, 2020, the aggregate market value of the registrant's voting and non-voting common equity held by non-affiliates was $28,802,579,969.

As of February 5, 2021, 252,214,355 shares of the registrant's common stock (without par value) were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant's Proxy Statement relating to the 2021 Annual Meeting of Shareholders are incorporated by reference into Part III of this report.

The Travelers Companies, Inc.

Annual Report on Form 10-K

For Fiscal Year Ended December 31, 2020

TABLE OF CONTENTS

Item Number						Page
			Part I
1.			Business			3
1A.			Risk Factors			43
1B.			Unresolved Staff Comments			57
2.			Properties			57
3.			Legal Proceedings			57
4.			Mine Safety Disclosures			57
			Part II
5.			Market for Registrant's Common Equity, Related Shareholder Matters and Issuer Purchases of Equity Securities			57
6.			Selected Financial Data			60
7.			Management's Discussion and Analysis of Financial Condition and Results of Operations			61
7A.			Quantitative and Qualitative Disclosures About Market Risk			119
8.			Financial Statements and Supplementary Data			121
9.			Changes in and Disagreements with Accountants on Accounting and Financial Disclosure			209
9A.			Controls and Procedures			209
9B.			Other Information			212
			Part III
10.			Directors, Executive Officers and Corporate Governance			212
11.			Executive Compensation			214
12.			Security Ownership of Certain Beneficial Owners and Management and Related Shareholder Matters			214
13.			Certain Relationships and Related Transactions, and Director Independence			215
14.			Principal Accountant Fees and Services			215
			Part IV
15.			Exhibits and Financial Statement Schedules			215
16.			Form 10-K Summary			217
			Signatures			218