Debt under Vehicle Programs and Borrowing Arrangements - Schedule Of Debt Under Vehicle Programs (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total	$ 18,937	$ 13,809
Deferred financing fees	55	44
Americas – Debt due to Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Total	15,502	11,322
Americas – Debt borrowings
Debt Instrument [Line Items]
Total	1,075	598
International – Debt borrowings
Debt Instrument [Line Items]
Total	2,203	1,700
International – Finance leases
Debt Instrument [Line Items]
Total	172	176
Other
Debt Instrument [Line Items]
Total	55	65
Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees	(70)	(52)
Deferred financing fees | Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Deferred financing fees	$ 61	$ 47