Debt Under Vehicle Programs and Borrowing Arrangements (Schedule of Debt Under Vehicle Programs) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Debt under vehicle programs	$ 17,239	$ 17,536
Deferred financing fees	59	60
Americas - Debt due to Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Debt under vehicle programs	13,851	14,143
Debt Due To Rental Car Funding, Class R Notes
Debt Instrument [Line Items]
Debt under vehicle programs	738	751
Americas - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	1,127	1,160
International - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	2,203	2,159
International - Finance leases
Debt Instrument [Line Items]
Debt under vehicle programs	130	143
Other
Debt Instrument [Line Items]
Debt under vehicle programs	0	8
Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees	(72)	(77)
Avis Budget Rental Car Funding | Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees	$ 57	$ 60