Goodwill and Intangible Assets, Net - Changes in Goodwill by Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 7,171	$ 7,380
Impairment charges	0	(14)	$ (799)
Additions		5
Deductions		(201)
Foreign exchange translation and other	(28)	1
Goodwill, Ending Balance	7,143	7,171	7,380
Retail
Goodwill [Roll Forward]
Goodwill, Beginning Balance	6,462	6,505
Impairment charges		0
Additions		0
Deductions		(34)
Foreign exchange translation and other	(29)	(9)
Goodwill, Ending Balance	6,433	6,462	6,505
B2B
Goodwill [Roll Forward]
Goodwill, Beginning Balance	394	538
Impairment charges		(14)
Additions		0
Deductions		(167)
Foreign exchange translation and other	18	37
Goodwill, Ending Balance	412	394	538
trivago
Goodwill [Roll Forward]
Goodwill, Beginning Balance	315	337
Impairment charges		0
Additions		5
Deductions		0
Foreign exchange translation and other	(17)	(27)
Goodwill, Ending Balance	$ 298	$ 315	$ 337