Segment Information - Revenue by Services and Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 8,598	$ 5,199	$ 12,067
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	6,569	3,511	6,869
All other countries
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	2,029	1,688	5,198
Lodging
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	6,449	4,051	8,362
Air
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	254	105	869
Advertising and media
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	603	405	1,104
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	1,292	638	1,732
Other | Bodybuilding.com
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue		59	58
Sales Channel, Through Intermediary | Merchant
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	5,537	3,261	6,763
Sales Channel, Through Intermediary | Agency
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	2,307	1,267	3,882
Sales Channel, Through Intermediary | Advertising, media and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 754	$ 671	$ 1,422