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Equity Method Investments - Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 21, 2023 USD ($) | Dec. 31, 2023 USD ($) seat | Mar. 31, 2022 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) seat | Dec. 31, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of seats held on the board of directors | seat |  | 2 |  |  | 2 |  |  |
Impairment of equity method investment |  |  |  | $ 0 | $ 0 | $ 182 |  |
Proceeds from sale of equity method investments |  |  |  | 17 | 721 | 0 |  |
Revaluation of MLU B.V. call option |  |  |  | $ 0 | 0 | 191 |  |
Call Option |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Initial fair value |  |  |  |  |  |  | $ 230 |
Careem Technologies |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment trading |  | $ 400 |  |  | $ 400 |  |  |
Gain (loss) on other income (expense) |  | $ 204 |  |  |  |  |  |
Equity ownership interest (as a percent) |  | 42.00% |  |  | 42.00% |  |  |
Initial carrying value |  | $ 300 |  |  | $ 300 |  |  |
MLU B.V. |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity ownership interest (as a percent) | 29.00% |  |  |  |  |  |  | 38.00%
Impairment of equity method investment |  |  | $ 182 |  |  |  |  |
Proceeds from sale of equity method investments | $ 703 |  |  |  |  |  |  |
MLU B.V. | Call Option |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Initial fair value |  |  |  |  |  | 2 |  |
Revaluation of MLU B.V. call option |  |  |  |  |  | $ 191 |  |
MLU B.V. | Call Option | Expected Term |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Call option term |  |  |  |  |  | 0.7 |  |
MLU B.V. | Call Option | Option Volatility |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Call option term |  |  |  |  |  | 0.65 |  |

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