Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 19, 2018
Document and Entity Information
Registrant name	Travelers Companies, Inc.
Central index key	0000086312
Document type	10-Q
Document period end date	Mar. 31, 2018
Amendment flag	false
Current fiscal year end date	--12-31
Filer category	Large Accelerated Filer
Common stock shares outstanding		270,261,296
Document fiscal year focus	2018
Document fiscal period focus	Q1