Consolidating Financial Statements (details) (USD $) In Billions	Jun. 30, 2011
Consolidating Financial Statements disclosure
Amount of certain debt obligations of TPC that are unconditionally guaranteed by the Travelers Companies, Inc.	$ 1.20

Name:

trv_AmountOfDebtObligationsUnconditionallyGuaranteedByParent

Namespace Prefix:

trv

Data Type:

xbrli:monetaryItemType

Balance Type:

credit

Period Type:

instant