Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 05, 2016	Jun. 30, 2015
Document and Entity Information
Registrant name	TRAVELERS COMPANIES, INC.
Central index key	0000086312
Document type	10-K
Document period end date	Dec. 31, 2015
Amendment flag	false
Current fiscal year end date	--12-31
Well-known seasoned issuer	Yes
Voluntary filers	No
Current reporting status	Yes
Filer category	Large Accelerated Filer
Entity public float			$ 29,961,887,660
Common stock shares outstanding		294,977,349
Document fiscal year focus	2015
Document fiscal period focus	FY