Goodwill and Intangible Assets, Net - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Impairment of goodwill				$ 0	$ 0	$ 297
Accumulated goodwill impairment loss				3,600
Amortization of intangible assets				40	57	59
Trade Names
Goodwill [Line Items]
Impairment of indefinite-lived intangible assets					147	129
Trivago
Goodwill [Line Items]
Impairment of indefinite-lived intangible assets		$ 33
Impairment of goodwill						297
Accumulated goodwill impairment loss				537
Trivago \| Trade Names
Goodwill [Line Items]
Impairment of indefinite-lived intangible assets					33	15
B2C
Goodwill [Line Items]
Impairment of indefinite-lived intangible assets	$ 114
Accumulated goodwill impairment loss				$ 3,000
B2C \| Trade Names
Goodwill [Line Items]
Impairment of indefinite-lived intangible assets			$ 114		$ 114	$ 114

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.

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+ Details

- Definition

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

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