Capitalized stock based compensation.

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- Definition

Cashless warrants exercised.

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No definition available.

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- Definition

Common stock issued on conversion of convertible securities.

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- Definition

The expiration date in which stock warrants need to be converted to common stock or the warrants will expire.

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- Definition

Number of potential common shares that could be issued if warrants assumed at Spin-Off were all exercised.

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- Definition

Share based compensation arrangement by share based payment award number of shares first authorized.

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- Definition

Share based compensation arrangement by share based payment award number of shares previously authorized.

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- Definition

Number of stock warrants exercised.

+ References

No definition available.

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- Definition

Weighted average exercise price of cashless warrants.

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No definition available.

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- Definition

Weighted average exercise price of warrants paid in cash.

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No definition available.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

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- Definition

Number of warrants or rights outstanding.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-SubTopic 10

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Paragraph 2

-Subparagraph (a)(2)

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

+ Details

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(2)

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 2

-Subparagraph (d)(1)

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Subparagraph (SX 210.3-04)

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-Number 210

-Section 02

-Paragraph 29, 30

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Stock Based Awards and Other Equity Instruments - Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended			0 Months Ended
	Jun. 28, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 20, 2011	Sep. 12, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Capitalized stock based compensation for website development costs		$ 8trip_CapitalizedStockBasedCompensation	$ 5trip_CapitalizedStockBasedCompensation
Common shares registered for issuance under incentive plan					17,500,000
Common stock share issuance under plan	15,000,000
Number of stock options issued		579,000
Total intrinsic value		75	58	25
Total fair value of stock options vested		34	27	10
Expiration date of conversion		May 07, 2012
Common stock, shares issued		132,315,465us-gaap_CommonStockSharesIssued	131,537,798us-gaap_CommonStockSharesIssued
One Tranche of Warrants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per warrant				$ 6.48
Common stock share exercisable for each warrant				0.25%
One Tranche of Warrants \| Prior to Adjustment
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per warrant				$ 12.23
Other Tranche of Warrants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per warrant				$ 7.66
Common stock share exercisable for each warrant				0.25%
Other Tranche of Warrants \| Prior to Adjustment
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price per warrant				$ 14.45
Warrants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Warrants Exercised				32,186,791
Common stock, shares issued				7,952,456
Weighted average exercise price of warrants				$ 27.11
Exercise proceeds received				$ 215
Cashless warrants exercised				545,454
Weighted average exercise price of cashless warrants				$ 25.92
Warrants convertible to common shares				0
Warrants \| Exercise Price Paid in Cash
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Warrants Exercised				31,641,337
Maximum \| Warrants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Warrants convertible into common stock shares at spin-off					8,046,698
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options issued		679,568
Term of stock options, granted		10 years
Stock options vest period		4 years
Closing stock price		$ 74.66
Grant-date fair value per option		$ 46.65	$ 28.30	$ 20.36
Acquisition Related Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant-date fair value per option		$ 80.31	$ 0	$ 0
2011 Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares registered for issuance under incentive plan					17,400,000
Common shares previously registered for issuance under incentive plan					7,400,000
Share registered under amendment					10,000,000
Common stock share issuance under plan		17,691,977
Stock options vest period		4 years
RSU's issued under incentive plan		752,460
Deferred Compensation Plan for Non Employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares registered for issuance under incentive plan					100,000
2010 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock						100,595