Debt under Vehicle Programs and Borrowing Arrangements - Schedule Of Debt Under Vehicle Programs (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Outstanding Borrowings	$ 11,438
Deferred financing fees	(48)	$ (48)
Total	11,390	6,857
Americas – Debt due to Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Outstanding Borrowings		5,116
Americas – Debt due to Avis Budget Rental Car Funding | Affiliated Entity
Debt Instrument [Line Items]
Outstanding Borrowings	8,889
Americas – Debt borrowings
Debt Instrument [Line Items]
Outstanding Borrowings	612	509
International – Debt borrowings
Debt Instrument [Line Items]
Outstanding Borrowings	1,757	1,115
International – Finance leases
Debt Instrument [Line Items]
Outstanding Borrowings	177	162
Other
Debt Instrument [Line Items]
Outstanding Borrowings	3	0
Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees	(48)	(45)
Deferred financing fees | Vehicle-backed debt due to Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Deferred financing fees	$ (41)	$ (36)