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Common Share Repurchases (details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 21, 2015
Repurchase activity      
Shares acquired to cover tax withholding costs and exercise costs $ 72,000,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation $ 55,000,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation  
Board of Directors Approved Repurchase Authorizations [Member]      
Repurchase activity      
Number of shares repurchased (in shares) 5.6us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= trv_StockRepurchaseProgramBoardOfDirectorApprovedRepurchaseAuthorizationsMember
   
Cost of shares repurchased 600,000,000us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= trv_StockRepurchaseProgramBoardOfDirectorApprovedRepurchaseAuthorizationsMember
   
Average cost per share $ 106.97us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_ShareRepurchaseProgramAxis
= trv_StockRepurchaseProgramBoardOfDirectorApprovedRepurchaseAuthorizationsMember
   
Remaining capacity under share repurchase authorization 884,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= trv_StockRepurchaseProgramBoardOfDirectorApprovedRepurchaseAuthorizationsMember
   
Additional share repurchase authorization     5,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= trv_StockRepurchaseProgramBoardOfDirectorApprovedRepurchaseAuthorizationsMember
Net shares acquired related to employee share-based compensation plans [Member]      
Repurchase activity      
Number of shares repurchased (in shares) 0.7us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= trv_StockRepurchasesOtherThanRepurchseAuthorizationMember
   
Shares acquired to cover tax withholding costs and exercise costs $ 72,000,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_ShareRepurchaseProgramAxis
= trv_StockRepurchasesOtherThanRepurchseAuthorizationMember