Stock-Based Compensation - Expedia Holdings Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	2 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
2005 Expedia Stock and Annual Incentive Plan | Expedia
Number of shares
Options outstanding, beginning balances		18,841,000
Granted (in shares)		3,618,000
Exercised (in shares)		(3,422,000)
Forfeited/Cancelled (in shares)		(3,384,000)
Options outstanding, ending balances	18,841,000	15,653,000	18,841,000
Options Exercisable		5,903,000
Weighted average exercise price
Weighted average exercise price, beginning balances		$ 84.07
Granted (in dollars per share)		124.08
Exercised (in dollars per share)		62.67
Forfeited/Cancelled (in dollars per share)		96.86
Weighted average exercise price, ending balances	$ 84.07	95.23	$ 84.07
Exercisable (in dollars per share)		$ 74.64
Additional disclosures
Outstanding Weighted Average Remaining contractual term		4 years 4 months 24 days
Exercisable Weighted Average Remaining contractual term		3 years 1 month 6 days
Outstanding Aggregate Intrinsic Value		$ 403
Exercisable Aggregate Intrinsic Value		$ 267
Weighted average grant date fair value of options granted	$ 34.59	$ 30.17
2016 Plan | Common Series A
Number of shares
Options outstanding, beginning balances		1,317,000
Granted (in shares)		5,000	6,000
Exercised (in shares)		(306,000)
Forfeited/Cancelled (in shares)		(8,000)
Options outstanding, ending balances	1,317,000	1,008,000	1,317,000
Options Exercisable		755,000
Weighted average exercise price
Weighted average exercise price, beginning balances		$ 24.46
Granted (in dollars per share)		44.65
Exercised (in dollars per share)		18.21
Forfeited/Cancelled (in dollars per share)		41.90
Weighted average exercise price, ending balances	$ 24.46	26.32	$ 24.46
Exercisable (in dollars per share)		$ 21.37
Additional disclosures
Outstanding Weighted Average Remaining contractual term		2 years 8 months 12 days
Exercisable Weighted Average Remaining contractual term		1 year 8 months 12 days
Outstanding Aggregate Intrinsic Value		$ 18
Exercisable Aggregate Intrinsic Value		$ 17
Weighted average grant date fair value of options granted		$ 14.48	$ 12.40
2016 Plan | Common Series B
Number of shares
Granted (in shares)		0
Exercised (in shares)		0
Forfeited/Cancelled (in shares)		0
Options outstanding, ending balances		659,000
Additional disclosures
Exercisable Weighted Average Remaining contractual term		4 years 2 months 12 days
Exercisable Aggregate Intrinsic Value		$ 4