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Share-Based Incentive Compensation (details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Share-Based Incentive Compensation disclosure      
Stock options vested at end of period, number (in shares) 8,185,698trv_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingNumber    
Stock options vested at end of period, weighted average exercise price (per share) $ 66.29trv_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingWeightedAverageExercisePrice    
Stock options vested at end of period, weighted average contractual life remaining 6 years 6 months 0 days    
Stock options vested at end of period, aggregate intrinsic value $ 342trv_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingAggregateIntrinsicValue    
Stock options exercisable at end of period, number (in shares) 5,234,347us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber    
Stock options exercisable at end of period, weighted average exercise price (per share) $ 53.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice    
Stock options exercisable at end of period, weighted average contractual life remaining 5 years 1 month 6 days    
Stock options exercisable at end of period, aggregate intrinsic value 287us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1    
Total compensation cost recognized in earnings for all share-based incentive compensation awards 47us-gaap_AllocatedShareBasedCompensationExpense 44us-gaap_AllocatedShareBasedCompensationExpense  
Tax benefit recognized in earnings related to compensation costs 16us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 15us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense  
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 211us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized   $ 123us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Weighted-average period of recognition for unrecognized compensation cost (in years) 2 years 1 month 6 days   1 year 8 months 12 days