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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 3,786	$ 3,558	$ 6,774	$ 6,447
Lodging
Segment Reporting Information [Line Items]
Revenue	3,040	2,862	5,329	5,090
Air
Segment Reporting Information [Line Items]
Revenue	105	111	212	226
EG Advertising
Segment Reporting Information [Line Items]
Revenue	182	152	356	297
Trivago Advertising
Segment Reporting Information [Line Items]
Revenue	98	77	183	147
Other
Segment Reporting Information [Line Items]
Revenue	361	356	694	687
Merchant \| Sales Channel, Through Intermediary
Segment Reporting Information [Line Items]
Revenue	2,624	2,459	4,670	4,423
Agency \| Sales Channel, Through Intermediary
Segment Reporting Information [Line Items]
Revenue	852	838	1,504	1,516
Advertising, media and other \| Sales Channel, Through Intermediary
Segment Reporting Information [Line Items]
Revenue	$ 310	$ 261	$ 600	$ 508