Schedule II (details) - Guarantees Footnote (details) (USD $)	12 Months Ended
	Dec. 31, 2011 years
Guarantor obligations
Period range for term of indemnification provisions arising from sales of business entities, minimum (in years)	7
Schedule II Guarantees Footnote
Amount of certain debt obligations of TPC that are unconditionally guaranteed by the Travelers Companies, Inc.	$ 1,200,000,000
Indemnifications related to the sale of business entities [Member]
Guarantor obligations
Maximum amount of contingent obligation	1,220,000,000
Amount recognized on balance sheet for contingent obligation	9,000,000
Indemnifications related to the sale of business entities [Member] | Travelers [Member]
Guarantor obligations
Maximum amount of contingent obligation	93,000,000
Amount recognized on balance sheet for contingent obligation	$ 9,000,000
Period range for term of indemnification provisions arising from sales of business entities, minimum (in years)	8