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Fair Value Measurements - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 02, 2022 EUR (€) instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Short-term investments | $ 300 |  | $ 28 |  | $ 300 | $ 28 |  |
Long term investments available for sale | $ 202 |  |  |  | $ 202 |  |  |
Maturity term | 4 years |  |  |  | 4 years |  |  |
Unrealized gain (loss) on investments |  |  |  |  | $ 1 |  |  |
Net gains (losses) from foreign currency forward contracts |  |  |  |  | (33) | (24) | $ (66) |
Gains (losses) on minority equity investments, net |  |  |  |  | 289 | 16 | (345) |
Impairment of goodwill |  |  |  |  | $ 0 | $ 297 | 0 |
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  | Impairment of intangible assets | Impairment of intangible assets |  |
Impairment of intangible assets |  |  |  |  | $ 147 | $ 129 | 81 |
Carrying value of cost method investments | $ 293 |  | $ 330 |  | 293 | $ 330 |  |
Proceeds from minority investment |  |  |  |  | 15 |  |  |
Gain on the transaction |  |  |  |  | 0 |  |  |
Cumulative unrealized downward adjustments | $ 127 |  |  |  | $ 127 |  |  |
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 | 0.025 |  | 0.03 |  | 0.025 | 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 |  | 0.04 | 0.04 |  |
Trade Names |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Impairment of indefinite-lived intangible assets |  |  |  |  | $ 147 | $ 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 |  | $ 33 |  | $ 15 |  | 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 |  | $ 114 |  |  | 114 |  |
Nonrecurring Basis |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Impairment losses related to a minority investment |  |  |  |  | $ 22 | $ 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% |  |
Despegar.com Corp. |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Gains (losses) on minority equity investments, net |  |  |  |  | $ 94 | $ 42 | (45) |
Global Business Travel Group | Equity investments |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Gains (losses) on minority equity investments, net |  |  |  |  | 217 | (26) | $ (300) |
Foreign currency forward contracts |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivatives | 3,900 |  |  |  | 3,900 |  |  |
Foreign currency forward contracts, liability | 2 |  | 9 |  | 2 | 9 |  |
Gross forward liability | 42 |  | 28 |  | 42 | 28 |  |
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 | $ 25 |  | $ 8 |  | 25 | 8 |  |
Gain on derivative recognized in interest expense |  |  |  |  | $ 5 | $ 5 |  |

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