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Consolidated Statement of Income Parentheticals (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statement of Income      
Total other-than-temporary impairment gains (losses) $ (22)trv_TotalCreditAndNonCreditImpairmentOfInvestments $ (10)trv_TotalCreditAndNonCreditImpairmentOfInvestments $ 27trv_TotalCreditAndNonCreditImpairmentOfInvestments
Other-than-temporary impairment, credit losses recognized in net realized investment gains (26)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet (15)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet (15)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Unrealized gains from other changes in total other-than-temporary impairments recognized in other comprehensive income (loss) as part of changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income $ 4trv_OtherThanTemporaryImpairmentGainsLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableForSaleSecurities $ 5trv_OtherThanTemporaryImpairmentGainsLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableForSaleSecurities $ 42trv_OtherThanTemporaryImpairmentGainsLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableForSaleSecurities