Acquisitions and Other Investments - Summary of Fair Value of Assets Acquired and Liabilities Assumed in Conjunction with Acquisition (Details) $ in Thousands, AUD in Millions			1 Months Ended		12 Months Ended
	Dec. 15, 2015 USD ($)	Sep. 17, 2015 USD ($)	Nov. 30, 2014 AUD	Nov. 30, 2014 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Goodwill					$ 7,942,023	$ 7,992,941	$ 3,955,901
Minimum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Estimated useful lives of acquired intangible assets					1 year
Maximum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Estimated useful lives of acquired intangible assets					12 years
Home Away Inc
Business Combination, Consideration Transferred [Abstract]
Fair value of shares of Expedia common stock issued to HomeAway stockholders and equity award holders	$ 2,515,755
Cash consideration for shares	1,027,061
Replacement restricted stock units and stock options attributable to pre-acquisition service	19,513
Total purchase consideration	3,562,329
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash	900,281
Other current assets	54,372
Long-term assets	90,890
Intangible assets with definite lives	533,279
Intangible assets with indefinite lives	239,200
Goodwill	2,613,151
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Deferred revenue	(181,837)
Other current liabilities	(109,581)
Debt	(401,580)
Other long-term liabilities	(30,989)
Deferred tax liabilities	(144,857)
Total	3,562,329
Business combination, accounts receivable gross	24,000
Business combination, accounts receivable estimated to uncollectible	$ 1,000
Weighted average life of acquired intangible assets	5 years 2 months 12 days
Home Away Inc | Minimum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Estimated useful lives of acquired intangible assets	1 year
Home Away Inc | Maximum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Estimated useful lives of acquired intangible assets	10 years
Orbitz Worldwide, Inc.
Business Combination, Consideration Transferred [Abstract]
Cash consideration for shares		$ 1,362,362
Settlement of Orbitz debt		432,231
Replacement restricted stock units and stock options attributable to pre-acquisition service		16,717
Other consideration		2,214
Total purchase consideration		1,813,524
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash		194,515
Accounts receivable, net		150,187
Other current assets		33,727
Long-term assets		114,800
Intangible assets with definite lives		515,003
Intangible assets with indefinite lives		166,800
Goodwill		1,444,307
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Current liabilities		(636,169)
Other long-term liabilities		(54,599)
Deferred tax liabilities		(115,047)
Total		1,813,524
Business combination, accounts receivable gross		157,000
Business combination, accounts receivable estimated to uncollectible		$ 7,000
Weighted average life of acquired intangible assets		6 years 11 days
Orbitz Worldwide, Inc. | Minimum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Estimated useful lives of acquired intangible assets		1 year
Orbitz Worldwide, Inc. | Maximum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Estimated useful lives of acquired intangible assets		10 years
Other Acquisitions During Period
Business Combination, Consideration Transferred [Abstract]
Cash consideration for shares						9,000	77,000
Replacement restricted stock units and stock options attributable to pre-acquisition service							7,000
Total purchase consideration							85,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash							48,000
Intangible assets with definite lives						146,126
Intangible assets with indefinite lives						163,400
Goodwill						196,431	70,000
Net assets and non-controlling interests acquired						(23,366)	(19,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Deferred tax liabilities						(7,910)	$ (17,000)
Total						$ 474,681
Weighted average life of acquired intangible assets						5 years 9 months 18 days	6 years 1 month 6 days
Business acquisition, cash acquired						$ 41,000
Equity method investment, non-cash consideration						$ 99,000
Other Acquisitions During Period | Minimum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Estimated useful lives of acquired intangible assets						4 years
Other Acquisitions During Period | Maximum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Estimated useful lives of acquired intangible assets						10 years
Wotif Group
Business Combination, Consideration Transferred [Abstract]
Total purchase consideration			AUD 652	$ 568,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Intangible assets with definite lives				138,292
Intangible assets with indefinite lives				125,762
Goodwill				350,093
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Deferred tax liabilities				(2,908)
Net liabilities				(43,429)
Total				$ 567,810
Weighted average life of acquired intangible assets			7 years 9 months 18 days	7 years 9 months 18 days
Business acquisition, cash acquired				$ 36,000
Wotif Group | Minimum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Estimated useful lives of acquired intangible assets			1 year	1 year
Wotif Group | Maximum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Estimated useful lives of acquired intangible assets			10 years	10 years