Percentage of Tax Benefit Likely To Be Realized Upon Settlement

No definition available.

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- Definition

Prepaid marketing expenses included within prepaid and other current assets.

+ References

No definition available.

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- Details

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 720

-SubTopic 35

-Section 50

-Paragraph 1

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- Definition

Value of deferred revenue or cost to provide products or services, which is expected to be recognized in income or incurred within one year or the normal operating cycle, if longer, resulting from customer loyalty program. Excludes liability associated with frequent flier programs. Includes liability associated with customer loyalty programs for other businesses, for example, but is not limited to, hotels, supermarkets, credit card companies, automobile rental companies, and book sellers.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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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

-Subparagraph (a)(1)

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Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 23, 2015
Significant Accounting Policies [Line Items]
Loyalty program liability	$ 235	$ 139
Advertising expense	1,600us-gaap_AdvertisingExpense	1,200us-gaap_AdvertisingExpense	890us-gaap_AdvertisingExpense
Prepaid marketing expenses	24expe_PrepaidMarketingExpenses	16expe_PrepaidMarketingExpenses
Stock Options
Significant Accounting Policies [Line Items]
Vesting period	4 years
Minimum
Significant Accounting Policies [Line Items]
Definite lived intangible assets, estimated useful life	1 year
Percentage of tax benefit likely to be realized upon settlement if the tax position meets the more likely than not criteria	50.00%
Minimum \| RSUs
Significant Accounting Policies [Line Items]
Vesting period	3 years
Maximum
Significant Accounting Policies [Line Items]
Definite lived intangible assets, estimated useful life	12 years
Maximum \| RSUs
Significant Accounting Policies [Line Items]
Vesting period	4 years
Subsequent Event \| Travelocity
Significant Accounting Policies [Line Items]
Business acquisition, cash paid				$ 280
Computer Equipment \| Minimum
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	3 years
Computer Equipment \| Maximum
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	5 years
Software Development \| Minimum
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	3 years
Software Development \| Maximum
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	5 years
Furniture and Fixtures \| Minimum
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	3 years
Furniture and Fixtures \| Maximum
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	5 years
Airasia Joint Venture
Significant Accounting Policies [Line Items]
Owned equity investments	50.00%