Debt Under Vehicle Programs And Borrowing Arrangements (Schedule Of Debt Under Vehicle Programs) (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt under vehicle programs	$ 7,801	$ 6,857
Debt Issuance Costs, Net	(49)	(48)
Americas - Debt due to Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Debt under vehicle programs	6,181	5,116
Americas - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	499	509
International - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	1,020	1,115
International - Finance leases
Debt Instrument [Line Items]
Debt under vehicle programs	140	162
Vehicle backed debt
Debt Instrument [Line Items]
Debt Issuance Costs, Net	(39)	(45)
Avis Budget Rental Car Funding | Vehicle backed debt
Debt Instrument [Line Items]
Debt Issuance Costs, Net	$ (32)	$ (36)