3.5.0.2 html 340 255 1 true 69 0 false 5 false false R1.htm 05000 - Statement - Document and Entity Information Sheet http://trv.com/role/DocumentAndEntityInformation Document and Entity Information Statements 1 false false R2.htm 10000 - Statement - Consolidated Statement of Income (Unaudited) Sheet http://trv.com/role/StatementOfIncome Consolidated Statement of Income (Unaudited) Statements 2 false false R3.htm 11000 - Statement - Consolidated Statement of Income Parentheticals (Unaudited) Sheet http://trv.com/role/StatementOfIncomeParentheticals Consolidated Statement of Income Parentheticals (Unaudited) Statements 3 false false R4.htm 15000 - Statement - Consolidated Statement of Comprehensive Income (Unaudited) Sheet http://trv.com/role/StatementOfComprehensiveIncome Consolidated Statement of Comprehensive Income (Unaudited) Statements 4 false false R5.htm 20000 - Statement - Consolidated Balance Sheet (Unaudited at June 30, 2016) Sheet http://trv.com/role/StatementOfFinancialPosition Consolidated Balance Sheet (Unaudited at June 30, 2016) Statements 5 false false R6.htm 25000 - Statement - Consolidated Balance Sheet Parentheticals (Unaudited at June 30, 2016) Sheet http://trv.com/role/BalanceSheetParentheticals Consolidated Balance Sheet Parentheticals (Unaudited at June 30, 2016) Statements 6 false false R7.htm 30000 - Statement - Consolidated Statement of Changes in Shareholders' Equity (Unaudited) Sheet http://trv.com/role/ConsolidatedStatementOfChangesInShareholdersEquityTable Consolidated Statement of Changes in Shareholders' Equity (Unaudited) Statements 7 false false R8.htm 40000 - Statement - Consolidated Statement of Cash Flows (Unaudited) Sheet http://trv.com/role/StatementOfCashFlows Consolidated Statement of Cash Flows (Unaudited) Statements 8 false false R9.htm 51010 - Disclosure - Basis of Presentation and Accounting Policies Sheet http://trv.com/role/BasisOfPresentationAndAccountingPoliciesFootnote Basis of Presentation and Accounting Policies Notes 9 false false R10.htm 51020 - Disclosure - Segment Information Sheet http://trv.com/role/SegmentInformationFootnote Segment Information Notes 10 false false R11.htm 51030 - Disclosure - Investments Sheet http://trv.com/role/InvestmentsFootnote Investments Notes 11 false false R12.htm 51040 - Disclosure - Fair Value Measurements Sheet http://trv.com/role/FairValueMeasurementsFootnote Fair Value Measurements Notes 12 false false R13.htm 51050 - Disclosure - Goodwill and Other Intangible Assets Sheet http://trv.com/role/GoodwillAndOtherIntangibleAssetsFootnote Goodwill and Other Intangible Assets Notes 13 false false R14.htm 51060 - Disclosure - Other Comprehensive Income and Accumulated Other Comprehensive Income Sheet http://trv.com/role/OtherComprehensiveIncomeAndAccumulatedOtherComprehensiveIncomeFootnote Other Comprehensive Income and Accumulated Other Comprehensive Income Notes 14 false false R15.htm 51070 - Disclosure - Debt Sheet http://trv.com/role/DebtFootnote Debt Notes 15 false false R16.htm 51080 - Disclosure - Common Share Repurchases Sheet http://trv.com/role/CommonShareRepurchasesFootnote Common Share Repurchases Notes 16 false false R17.htm 51090 - Disclosure - Earnings per Share Sheet http://trv.com/role/EarningsPerShareFootnote Earnings per Share Notes 17 false false R18.htm 51100 - Disclosure - Share-Based Incentive Compensation Sheet http://trv.com/role/ShareBasedIncentiveCompensationFootnote Share-Based Incentive Compensation Notes 18 false false R19.htm 51110 - Disclosure - Pension Plans, Retirement Benefits and Savings Plans Sheet http://trv.com/role/PensionPlansRetirementBenefitsAndSavingsPlansFootnote Pension Plans, Retirement Benefits and Savings Plans Notes 19 false false R20.htm 51120 - Disclosure - Contingencies, Commitments and Guarantees Sheet http://trv.com/role/ContingenciesCommitmentsAndGuaranteesFootnote Contingencies, Commitments and Guarantees Notes 20 false false R21.htm 51130 - Disclosure - Consolidating Financial Statements (Unaudited) Sheet http://trv.com/role/ConsolidatingFinancialStatementsFootnote Consolidating Financial Statements (Unaudited) Notes 21 false false R22.htm 52010 - Disclosure - Basis of Presentation and Accounting Policies (policies) Sheet http://trv.com/role/BasisOfPresentationAndAccountingPoliciesFootnote_policies Basis of Presentation and Accounting Policies (policies) Notes 22 false false R23.htm 53020 - Disclosure - Segment Information (tables) Sheet http://trv.com/role/SegmentInformationFootnote_tables Segment Information (tables) Notes 23 false false R24.htm 53030 - Disclosure - Investments (tables) Sheet http://trv.com/role/InvestmentsFootnote_tables Investments (tables) Notes 24 false false R25.htm 53040 - Disclosure - Fair Value Measurements (tables) Sheet http://trv.com/role/FairValueMeasurementsFootnote_tables Fair Value Measurements (tables) Notes 25 false false R26.htm 53050 - Disclosure - Goodwill and Other Intangible Assets (tables) Sheet http://trv.com/role/GoodwillAndOtherIntangibleAssetsFootnote_tables Goodwill and Other Intangible Assets (tables) Notes 26 false false R27.htm 53060 - Disclosure - Other Comprehensive Income and Accumulated Other Comprehensive Income (tables) Sheet http://trv.com/role/OtherComprehensiveIncomeAndAccumulatedOtherComprehensiveIncomeFootnote_tables Other Comprehensive Income and Accumulated Other Comprehensive Income (tables) Notes 27 false false R28.htm 53090 - Disclosure - Earnings per Share (table) Sheet http://trv.com/role/EarningsPerShareFootnote_table Earnings per Share (table) Notes 28 false false R29.htm 53100 - Disclosure - Share-Based Incentive Compensation (table) Sheet http://trv.com/role/ShareBasedIncentiveCompensationFootnote_table Share-Based Incentive Compensation (table) Notes 29 false false R30.htm 53110 - Disclosure - Pension Plans, Retirement Benefits and Savings Plans (table) Sheet http://trv.com/role/PensionPlansRetirementBenefitsAndSavingsPlansFootnote_table Pension Plans, Retirement Benefits and Savings Plans (table) Notes 30 false false R31.htm 53130 - Disclosure - Consolidating Financial Statements (Unaudited) (tables) Sheet http://trv.com/role/ConsolidatingFinancialStatementsFootnote_tables Consolidating Financial Statements (Unaudited) (tables) Notes 31 false false R32.htm 54010 - Disclosure - Basis of Presentation and Accounting Policies (details) Sheet http://trv.com/role/BasisOfPresentationAndAccountingPoliciesFootnote_details Basis of Presentation and Accounting Policies (details) Notes 32 false false R33.htm 54020 - Disclosure - Segment Information (details) Sheet http://trv.com/role/SegmentInformationFootnote_details Segment Information (details) Notes 33 false false R34.htm 54021 - Disclosure - Segment Information (details) - Assets by Segment Sheet http://trv.com/role/SegmentInformationFootnote_details_AssetsBySegment Segment Information (details) - Assets by Segment Notes 34 false false R35.htm 54030 - Disclosure - Investments (details) Sheet http://trv.com/role/InvestmentsFootnote_details Investments (details) Notes 35 false false R36.htm 54031 - Disclosure - Investments (details) - Investment Information Sheet http://trv.com/role/InvestmentsFootnote_details_InvestmentInfo Investments (details) - Investment Information Notes 36 false false R37.htm 54032 - Disclosure - Investments (details) - Derivatives Sheet http://trv.com/role/InvestmentsFootnote_details_Derivatives Investments (details) - Derivatives Notes 37 false false R38.htm 54040 - Disclosure - Fair Value Measurements (details) Sheet http://trv.com/role/FairValueMeasurementsFootnote_details Fair Value Measurements (details) Notes 38 false false R39.htm 54041 - Disclosure - Fair Value Measurements (details) - Fair Value Hierarchy Sheet http://trv.com/role/FairValueMeasurementsFootnote_details_FairValueHierarchy Fair Value Measurements (details) - Fair Value Hierarchy Notes 39 false false R40.htm 54042 - Disclosure - Fair Value Measurements Footnote (details) - Financial Instruments Sheet http://trv.com/role/FairValueMeasurementsFootnote_details_FinancialInstruments Fair Value Measurements Footnote (details) - Financial Instruments Notes 40 false false R41.htm 54050 - Disclosure - Goodwill (details) Sheet http://trv.com/role/GoodwillAndOtherIntangibleAssetsFootnote_details Goodwill (details) Notes 41 false false R42.htm 54051 - Disclosure - Goodwill (details) - Other Intangible Assets Sheet http://trv.com/role/GoodwillAndOtherIntangibleAssetsFootnote_details_OtherIntangibleAssets Goodwill (details) - Other Intangible Assets Notes 42 false false R43.htm 54060 - Disclosure - Other Comprehensive Income and Accumulated Other Comprehensive Income (details) Sheet http://trv.com/role/OtherComprehensiveIncomeAndAccumulatedOtherComprehensiveIncomeFootnote_details Other Comprehensive Income and Accumulated Other Comprehensive Income (details) Notes 43 false false R44.htm 54061 - Disclosure - Other Comprehensive Income and Accumulated Other Comprehensive Income (details) - Reclassifications Sheet http://trv.com/role/OtherComprehensiveIncomeAndAccumulatedOtherComprehensiveIncomeFootnote_details_Reclassifications Other Comprehensive Income and Accumulated Other Comprehensive Income (details) - Reclassifications Notes 44 false false R45.htm 54070 - Disclosure - Debt (details) Sheet http://trv.com/role/DebtFootnote_details Debt (details) Notes 45 false false R46.htm 54071 - Disclosure - Debt (details) - Payment Sheet http://trv.com/role/DebtFootnote_details_Payment Debt (details) - Payment Notes 46 false false R47.htm 54080 - Disclosure - Common Share Repurchases (details) Sheet http://trv.com/role/CommonShareRepurchasesFootnote_details Common Share Repurchases (details) Notes 47 false false R48.htm 54090 - Disclosure - Earnings per Share (details) Sheet http://trv.com/role/EarningsPerShareFootnote_details Earnings per Share (details) Notes 48 false false R49.htm 54100 - Disclosure - Share-Based Incentive Compensation (details) Sheet http://trv.com/role/ShareBasedIncentiveCompensationFootnote_details Share-Based Incentive Compensation (details) Notes 49 false false R50.htm 54110 - Disclosure - Pension Plans, Retirement Benefits and Savings Plans (details) Sheet http://trv.com/role/PensionPlansRetirementBenefitsAndSavingsPlansFootnote_details Pension Plans, Retirement Benefits and Savings Plans (details) Notes 50 false false R51.htm 54111 - Disclosure - Pension Plans, Retirement Benefits and Savings Plans (details) - Additional Pension Disclosures Sheet http://trv.com/role/PensionPlansRetirementBenefitsAndSavingsPlansFootnote_details_AdditionalPensionDisclosures Pension Plans, Retirement Benefits and Savings Plans (details) - Additional Pension Disclosures Notes 51 false false R52.htm 54120 - Disclosure - Contingencies, Commitments and Guarantees (details) Sheet http://trv.com/role/ContingenciesCommitmentsAndGuaranteesFootnote_details Contingencies, Commitments and Guarantees (details) Notes 52 false false R53.htm 54121 - Disclosure - Contingencies, Commitments and Guarantees (details) - Gain Contingencies Sheet http://trv.com/role/ContingenciesCommitmentsAndGuaranteesFootnote_details_GainContingencies Contingencies, Commitments and Guarantees (details) - Gain Contingencies Notes 53 false false R54.htm 54122 - Disclosure - Contingencies, Commitments and Guarantees (details) - Guarantees Sheet http://trv.com/role/ContingenciesCommitmentsAndGuaranteesFootnote_details_Guarantees Contingencies, Commitments and Guarantees (details) - Guarantees Notes 54 false false R55.htm 54130 - Disclosure - Consolidating Financial Statements (Unaudited) (details) Sheet http://trv.com/role/ConsolidatingFinancialStatementsFootnote_details Consolidating Financial Statements (Unaudited) (details) Notes 55 false false R56.htm 54131 - Disclosure - Consolidating Financial Statements (details) - Consolidating Statement of Income (Unaudited) Sheet http://trv.com/role/ConsolidatingFinancialStatementsFootnote_details_ConsolidatingIncomeStatement Consolidating Financial Statements (details) - Consolidating Statement of Income (Unaudited) Notes 56 false false R57.htm 54132 - Disclosure - Consolidating Financial Statements (details) - Consolidating Statement of Comprehensive Income (Unaudited) Sheet http://trv.com/role/ConsolidatingFinancialStatementsFootnote_details_ConsolidatingStatementOfComprehensiveIncome Consolidating Financial Statements (details) - Consolidating Statement of Comprehensive Income (Unaudited) Notes 57 false false R58.htm 54133 - Disclosure - Consolidating Financial Statements (details) - Consolidating Balance Sheet (Unaudited) Sheet http://trv.com/role/ConsolidatingFinancialStatementsFootnote_details_ConsolidatingBalanceSheet Consolidating Financial Statements (details) - Consolidating Balance Sheet (Unaudited) Notes 58 false false R59.htm 54134 - Disclosure - Consolidating Financial Statements (details) - Consolidating Statement of Cash Flows (Unaudited) Sheet http://trv.com/role/ConsolidatingFinancialStatementsFootnote_details_ConsolidatingCashFlowStatement Consolidating Financial Statements (details) - Consolidating Statement of Cash Flows (Unaudited) Notes 59 false false All Reports Book All Reports trv-20160630.xml trv-20160630.xsd trv-20160630_cal.xml trv-20160630_def.xml trv-20160630_lab.xml trv-20160630_pre.xml true true