Debt under Vehicle Programs and Borrowing Arrangements - Schedule Of Debt Under Vehicle Programs (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total	$ 19,188	$ 17,536
Deferred financing fees	56	60
Americas – Debt due to Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Total	14,447	14,143
Debt Due To Rental Car Funding, Class R Notes
Debt Instrument [Line Items]
Total	826	751
Americas – Debt borrowings
Debt Instrument [Line Items]
Total	2,202	1,160
International – Debt borrowings
Debt Instrument [Line Items]
Total	2,480	2,159
International – Finance leases
Debt Instrument [Line Items]
Total	130	143
Other
Debt Instrument [Line Items]
Total	0	8
Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees	(71)	(77)
Deferred financing fees | Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Deferred financing fees	$ 51	$ 60