Debt Under Vehicle Programs and Borrowing Arrangements (Schedule of Debt Under Vehicle Programs) (Details) £ in Millions, $ in Millions, € in Billions	Sep. 30, 2024 USD ($)	Feb. 29, 2024 EUR (€)	Feb. 29, 2024 GBP (£)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Debt under vehicle programs	$ 17,893			$ 18,937
Deferred financing fees	70			55
Americas - Debt due to Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Debt under vehicle programs	13,903			15,502
Debt Due To Rental Car Funding, Class R Notes
Debt Instrument [Line Items]
Debt under vehicle programs	726			841
Americas - Debt borrowings (b)
Debt Instrument [Line Items]
Debt under vehicle programs	1,213			1,075
International - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	2,672			2,203
International - Finance leases
Debt Instrument [Line Items]
Debt under vehicle programs	179			172
Other
Debt Instrument [Line Items]
Debt under vehicle programs	10			55
Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees	(84)			(70)
Repurchase Facility
Debt Instrument [Line Items]
Debt under vehicle programs	116
European rental fleet securitization program
Debt Instrument [Line Items]
Debt under vehicle programs		€ 1.9	£ 200
Avis Budget Rental Car Funding | Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees	$ 66			$ 61