Name:	trv_EstimatedFairValueOfPutCallOption
Namespace Prefix:	trv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The fair value of the fixed maturities for which the Company received a broker quote for use in determining fair value.

No definition available.

Name:	trv_FairValueOfFixedMaturitiesForWhichCompanyReceivedBrokerQuote
Namespace Prefix:	trv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The fair value of the fixed maturities for which the Company used an internal pricing matrix in determining fair value.

No definition available.

Name:	trv_FairValueOfFixedMaturitiesForWhichCompanyUsedInternalPricingMatrix
Namespace Prefix:	trv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The percent change in monthly price at which the Company further evaluates securities.

No definition available.

Name:	trv_PercentChangeInMonthlyPriceRequiringEvaluation
Namespace Prefix:	trv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Percentage of fixed maturities for which a pricing service was used in determining fair value.

No definition available.

Name:	trv_PercentOfFixedMaturitiesForWhichPricingServiceEstimatesFairValue
Namespace Prefix:	trv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.