Fair Value Measurements - Additional Information (Details) $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 01, 2021	Nov. 30, 2021 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 02, 2022 EUR (€) instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) from foreign currency forward contracts				$ (24)	$ (66)	$ 1
(Gain) loss on minority equity investments, net				16	(345)	(29)
Impairment of goodwill				297	0	14
Carrying value of cost method investments			$ 330	330	330
Cumulative unrealized upward adjustments			2	2
Cumulative unrealized downward adjustments			$ 105	$ 105
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]				Intangible and other long-term asset impairment
Measurement Input, Projected Revenues And Royalty Rates | Fair Value, Inputs, Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Intangible assets, indefinite-lived (excluding goodwill), measurement input			0.03	0.03
Measurement Input, Projected Revenues And Royalty Rates | Fair Value, Inputs, Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Intangible assets, indefinite-lived (excluding goodwill), measurement input			0.04	0.04
Measurement Input, Projected Revenues And Royalty Rates | Fair Value, Inputs, Level 3 | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Intangible assets, indefinite-lived (excluding goodwill), measurement input			0.032	0.032
Trade Names
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of indefinite-lived intangible assets				$ 129
Trivago
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of goodwill				297
Trivago | Trade Names
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of indefinite-lived intangible assets				15	81
B2C
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of goodwill				0
B2C | Trade Names
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of indefinite-lived intangible assets			$ 114
B2B
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of goodwill				0		14
Long-lived assets impairment charge						6
Nonrecurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment losses related to a minority investment				$ 0	$ 0	0
Global Business Travel Group
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity interest maintained				16.00%	16.00%
Exchange ratio					1
Global Business Travel Group | Disposed of by Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity interest maintained		19.00%
American Express Global Business Travel
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		$ 815
American Express Global Business Travel | Disposed of by Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity interest maintained	19.00%
Despegar.com Corp.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
(Gain) loss on minority equity investments, net				$ 42	$ (45)	$ (29)
Global Business Travel Group | Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
(Gain) loss on minority equity investments, net				(26)	(300)
Foreign currency forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount of derivatives			3,700	3,700
Foreign currency forward contracts, liability			9	9
Gross forward liability			28	28
Foreign currency forward contracts, assets					15
Gross forward asset					29
Cross-currency interest rate swaps | Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount of derivatives | €							€ 300,000,000
Fixed-to fixed cross currency interest rate swaps entered into | instrument							2
Fair value of derivative, asset			$ 8	8
Gain on derivative recognized in interest expense				$ 5	$ 5