Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Segment Information - Revenue by Business Model and Service Type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 2,111	$ 566	$ 3,357	$ 2,775
Lodging
Segment Reporting Information [Line Items]
Revenue	1,533	487	2,436	2,029
Air
Segment Reporting Information [Line Items]
Revenue	78	(70)	128	39
Advertising and media
Segment Reporting Information [Line Items]
Revenue	161	25	249	228
Other
Segment Reporting Information [Line Items]
Revenue	339	124	544	479
Other \| Bodybuilding.com
Segment Reporting Information [Line Items]
Revenue		20		59
Sales Channel, Through Intermediary \| Merchant
Segment Reporting Information [Line Items]
Revenue	1,338	368	2,134	1,708
Sales Channel, Through Intermediary \| Agency
Segment Reporting Information [Line Items]
Revenue	573	105	896	667
Sales Channel, Through Intermediary \| Advertising, media and other
Segment Reporting Information [Line Items]
Revenue	$ 200	$ 93	$ 327	$ 400