Name:	trv_ConvertiblePreferredStockSharesConversionRatio
Namespace Prefix:	trv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The total number of shares issued for all convertible preferred stock that is converted.

No definition available.

Name:	trv_ConvertiblePreferredStockTotalSharesIssuedUponConversion
Namespace Prefix:	trv_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	trv_DefinedContributionPlanDisclosureLineItems
Namespace Prefix:	trv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Period over which an employee vests in the employer matching contribution.

No definition available.

Name:	trv_DefinedContributionPlanEmployerContributionVestingPeriod
Namespace Prefix:	trv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Maximum amount the employer may match per employee contribution to a defined contribution plan.

No definition available.

Name:	trv_DefinedContributionPlanMaximumEmployerAnnualMatchingContributionsPerEmployee
Namespace Prefix:	trv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The specified salary limit for participation in the plan.

No definition available.

Name:	trv_DefinedContributionPlanSalaryLimitForParticipationInPlan
Namespace Prefix:	trv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The percentage which the employee vests in employer matching contributions after the vesting period expires.

No definition available.

Name:	trv_DefinedContributionPlanVestingPercentageAfterVestingPeriod
Namespace Prefix:	trv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The amount of the cost recognized during the period for defined contribution plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Percentage employer matches of the employee's percentage contribution matched.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The amount per share used to calculated dividend payments on preferred stock.

No definition available.

Name:	us-gaap_PreferredStockDividendRatePerDollarAmount
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5