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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 4,412	$ 4,060	$ 11,186	$ 10,507
Lodging
Segment Reporting Information [Line Items]
Revenue	3,604	3,317	8,933	8,407
Air
Segment Reporting Information [Line Items]
Revenue	101	104	313	330
EG Advertising
Segment Reporting Information [Line Items]
Revenue	194	167	550	464
Trivago Advertising
Segment Reporting Information [Line Items]
Revenue	137	102	320	249
Other
Segment Reporting Information [Line Items]
Revenue	376	370	1,070	1,057
Merchant \| Sales Channel, Through Intermediary
Segment Reporting Information [Line Items]
Revenue	3,096	2,805	7,766	7,228
Agency \| Sales Channel, Through Intermediary
Segment Reporting Information [Line Items]
Revenue	955	953	2,459	2,469
Advertising, media and other \| Sales Channel, Through Intermediary
Segment Reporting Information [Line Items]
Revenue	$ 361	$ 302	$ 961	$ 810