Goodwill and Intangible Assets, Net - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Impairment of goodwill		$ 297	$ 0	$ 14
Accumulated goodwill impairment loss	$ 3,600	3,600	3,300
Amortization of intangible assets		59	88	99
Trade Names
Goodwill [Line Items]
Impairment of indefinite-lived intangible assets		129
Trivago
Goodwill [Line Items]
Impairment of goodwill		297
Accumulated goodwill impairment loss	537	537	240
Trivago | Trade Names
Goodwill [Line Items]
Impairment of indefinite-lived intangible assets		15	81
B2C
Goodwill [Line Items]
Impairment of goodwill		0
Accumulated goodwill impairment loss	3,000	3,000	3,000
B2C | Trade Names
Goodwill [Line Items]
Impairment of indefinite-lived intangible assets	114
B2B
Goodwill [Line Items]
Impairment of goodwill		0		$ 14
Accumulated goodwill impairment loss	$ 14	$ 14	$ 14