Debt Under Vehicle Programs and Borrowing Arrangements (Schedule of Debt Under Vehicle Programs) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Debt under vehicle programs	$ 19,262	$ 17,536
Deferred financing fees related to debt	60	60
Americas - Debt due to Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Debt under vehicle programs	14,952	14,143
Debt Due To Rental Car Funding, Class R Notes
Debt Instrument [Line Items]
Debt under vehicle programs	814	751
Americas - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	1,276	1,160
International - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	2,967	2,159
International - Finance leases
Debt Instrument [Line Items]
Debt under vehicle programs	141	143
Other
Debt Instrument [Line Items]
Debt under vehicle programs	0	8
Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees	(74)	(77)
Avis Budget Rental Car Funding \| Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees related to debt	$ 58	$ 60

AVIS BUDGET GROUP, INC. 10-Q