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Financial Instruments - Schedule Of Carrying Amounts And Estimated Fair Values (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | $ 4,791 | $ 4,644
Carrying Amount | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term debt and current portion of long-term debt | 32 | 27
Long-term debt | 4,791 | 4,644
Carrying Amount | Level 2 | Interest rate swaps and interest rate caps |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate swaps and interest rate caps | 74 | 111
Carrying Amount | Vehicle-Backed Debt | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Vehicle-backed debt | 3,422 | 2,423
Carrying Amount | Vehicle-backed debt due to Avis Budget Rental Car Funding | Vehicle-Backed Debt | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Vehicle-backed debt | 15,441 | 11,275
Estimated Fair Value | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term debt and current portion of long-term debt | 32 | 26
Long-term debt | 4,812 | 4,411
Estimated Fair Value | Level 2 | Interest rate swaps and interest rate caps |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate swaps and interest rate caps | 74 | 111
Estimated Fair Value | Vehicle-Backed Debt | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Vehicle-backed debt | 3,435 | 2,422
Estimated Fair Value | Vehicle-backed debt due to Avis Budget Rental Car Funding | Vehicle-Backed Debt | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Vehicle-backed debt | $ 15,238 | $ 10,848

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