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Goodwill (details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill by segment    
Goodwill $ 3,611us-gaap_Goodwill $ 3,634us-gaap_Goodwill
Reportable Segments [Member] | Business and International Insurance [Member]    
Goodwill by segment    
Goodwill 2,476us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= trv_BusinessAndInternationalInsuranceMember		 2,499us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= trv_BusinessAndInternationalInsuranceMember
Reportable Segments [Member] | Bond & Specialty Insurance [Member]    
Goodwill by segment    
Goodwill 495us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= trv_BondAndSpecialtyInsuranceMember		 495us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= trv_BondAndSpecialtyInsuranceMember
Reportable Segments [Member] | Personal Insurance [Member]    
Goodwill by segment    
Goodwill 613us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= trv_PersonalInsuranceMember		 613us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= trv_PersonalInsuranceMember
Other [Member]    
Goodwill by segment    
Goodwill $ 27us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember		 $ 27us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember