Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 15, 2018
Document and Entity Information
Registrant name	Travelers Companies, Inc.
Central index key	0000086312
Document type	10-Q
Document period end date	Sep. 30, 2018
Amendment flag	false
Current fiscal year end date	--12-31
Filer category	Large Accelerated Filer
Entity emerging growth company	false
Entity small business	false
Common stock shares outstanding		264,882,804
Document fiscal year focus	2018
Document fiscal period focus	Q3