Debt - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Credit Facility
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 1,000,000,000
Line of credit facility, expiration date	2019-09
Credit facility borrowings outstanding	0	0
Interest, on drawn amount	LIBOR plus 150 basis points
Commitment fee on undrawn amounts	0.20%
Basis points added to LIBOR rate	1.50%
Letters of credit issued under the credit facility	15,000,000	19,000,000
Senior Notes
Debt Instrument [Line Items]
Accrued interest related to senior notes	39,000,000	31,000,000
4.5% Senior Notes Due 2024
Debt Instrument [Line Items]
Senior unsecured notes principal amount	500,000,000
Senior notes, maturity date	2024-08
Senior notes, interest rate	4.50%
Senior notes redemption price percentage at the option of company	100.00%
Redemption at option of Company	We may redeem the 4.5% Notes at our option at any time in whole or from time to time in part. If we elect to redeem the 4.5% Notes prior to May 15, 2024, we may redeem them at a redemption price of 100% of the principal plus accrued interest, plus a "make-whole" premium. If we elect to redeem the 4.5% Notes on or after May 15, 2024, we may redeem them at a redemption price of 100% of the principal plus accrued interest.
Senior notes issued price percentage	99.444%
Fair value of senior notes	504,000,000
7.456% Senior Notes Due 2018
Debt Instrument [Line Items]
Senior unsecured notes principal amount	500,000,000
Senior notes, maturity date	2018-08
Senior notes, interest rate	7.456%
Senior notes redemption price percentage at the option of company	100.00%
Redemption at option of Company	At any time Expedia may redeem the 7.456% Notes at a redemption price of 100% of the principal plus accrued interest, plus a "make-whole" premium, in whole or in part.
Fair value of senior notes	581,000,000	587,000,000
5.95% Senior Notes Due 2020
Debt Instrument [Line Items]
Senior unsecured notes principal amount	750,000,000
Senior notes, maturity date	2020-08
Senior notes, interest rate	5.95%
Senior notes redemption price percentage at the option of company	100.00%
Redemption at option of Company	We may redeem the 5.95% Notes at a redemption price of 100% of the principal plus accrued interest, plus a "make-whole" premium, in whole or in part.
Senior notes issued price percentage	99.893%
Fair value of senior notes	$ 840,000,000	$ 816,000,000

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM format.

No definition available.

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- Definition

Date the credit facility terminates, in CCYY-MM format.

+ References

No definition available.

+ Details

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- Definition

The senior notes were issued at a percentage of par (less than 100% of par results in a discount).

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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-Topic 210

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-Subparagraph (SX 210.5-02.22(a)(1))

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- Definition

Description of debt redemption features under terms of the debt agreement.

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-SubTopic 470

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

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-Number 210

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-Topic 942

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- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

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-Publisher FASB

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-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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