Debt Under Vehicle Programs and Borrowing Arrangements (Schedule of Debt Under Vehicle Programs) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Debt under vehicle programs	$ 18,653	$ 13,809
Deferred financing fees	43	44
Americas - Debt due to Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Debt under vehicle programs	15,182	11,322
Americas - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	889	598
International - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	2,385	1,700
International - Finance leases
Debt Instrument [Line Items]
Debt under vehicle programs	184	176
Other
Debt Instrument [Line Items]
Debt under vehicle programs	86	65
Deferred Financing Fees
Debt Instrument [Line Items]
Deferred financing fees	(73)	(52)
Avis Budget Rental Car Funding | Deferred Financing Fees
Debt Instrument [Line Items]
Deferred financing fees	$ 67	$ 47