Segment Information - Revenue by Services and Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 13,691	$ 12,839	$ 11,667
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	8,372	8,147	7,939
All other countries
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	5,319	4,692	3,728
Lodging
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	10,950	10,264	8,905
Air
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	428	410	362
Advertising and media
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	954	821	777
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	1,359	1,344	1,623
Sales Channel, Through Intermediary | Merchant
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	9,439	8,818	7,762
Sales Channel, Through Intermediary | Agency
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	3,169	3,075	2,994
Sales Channel, Through Intermediary | Advertising, media and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 1,083	$ 946	$ 911