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 - Schedule of Revenue by Services (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Revenue	$ 4,315	$ 3,786	$ 7,741	$ 6,774
Lodging
Segment Reporting [Line Items]
Revenue	3,429	3,040	6,039	5,329
Air
Segment Reporting [Line Items]
Revenue	91	105	198	212
Expedia Group (“EG”) Advertising
Segment Reporting [Line Items]
Revenue	206	182	403	356
trivago Advertising
Segment Reporting [Line Items]
Revenue	145	98	270	183
Other
Segment Reporting [Line Items]
Revenue	444	361	831	694
Merchant \| Sales Channel, Through Intermediary
Segment Reporting [Line Items]
Revenue	3,065	2,624	5,466	4,670
Agency \| Sales Channel, Through Intermediary
Segment Reporting [Line Items]
Revenue	872	852	1,547	1,504
Advertising, media and other \| Sales Channel, Through Intermediary
Segment Reporting [Line Items]
Revenue	$ 378	$ 310	$ 728	$ 600