Debt Under Vehicle Programs And Borrowing Arrangements (Schedule Of Debt Under Vehicle Programs) (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt under vehicle programs	$ 10,749	$ 6,857
Deferred financing fees	(51)	(48)
Americas - Debt due to Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Debt under vehicle programs	8,156	5,116
Americas - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	693	509
International - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	1,764	1,115
International - Finance leases
Debt Instrument [Line Items]
Debt under vehicle programs	177	162
Other
Debt Instrument [Line Items]
Debt under vehicle programs	3	0
Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees	(44)	(45)
Avis budget rental car funding | Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees	$ (39)	$ (36)