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Related Party Transactions - Equity Method Investment in Balance Sheet and Statements of Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Related Party Transaction [Line Items] |  |  |  |  |
Receivables from AMV | $ 21,352 |  | $ 21,352 |  | $ 21,240
Equity method investment in AMV | 421 |  | 421 |  | 441
Vehicles, net investment in lease with AMV | 99 |  | 99 |  | 31
Other (income) expense, net | (3) | $ (1) | (6) | $ (3) |
Avis Mobility Ventures LLC (AMV) | Related Party | Avis Mobility Ventures LLC (AMV) |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Equity method investment in AMV | 29 |  | 29 |  | 24
Other (income) expense, net | 3 | 1 | 6 | 3 |
Avis Mobility Ventures LLC (AMV) | Receivables From Related Party | Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Receivables from AMV | 2 |  | 2 |  | $ 2
Avis Mobility Ventures LLC (AMV) | Administrative Services | Related Party | Avis Mobility Ventures LLC (AMV) |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Other (income) expense, net | 1 | (6) | (1) | (20) |
Avis Mobility Ventures LLC (AMV) | Equipment Investment | Related Party | Avis Mobility Ventures LLC (AMV) |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Other (income) expense, net | $ 2 | $ 7 | $ 7 | $ 23 |

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