Debt Under Vehicle Programs and Borrowing Arrangements (Schedule of Debt Under Vehicle Programs) (Details) € in Millions, £ in Millions, $ in Millions	Mar. 31, 2024 USD ($)	Feb. 29, 2024 EUR (€)	Feb. 29, 2024 GBP (£)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Debt under vehicle programs	$ 19,190			$ 18,937
Deferred financing fees	62			55
Americas - Debt due to Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Debt under vehicle programs	16,030			15,502
Debt Due To Rental Car Funding, Class R Notes
Debt Instrument [Line Items]
Debt under vehicle programs	843			841
Americas - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	1,082			1,075
International - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	1,973			2,203
International - Finance leases
Debt Instrument [Line Items]
Debt under vehicle programs	164			172
Other
Debt Instrument [Line Items]
Debt under vehicle programs	40			55
Deferred Financing Fees
Debt Instrument [Line Items]
Deferred financing fees	(99)			(70)
European Rental Fleet Securitization Program
Debt Instrument [Line Items]
Debt under vehicle programs		€ 1,900	£ 200
Avis Budget Rental Car Funding | Deferred Financing Fees
Debt Instrument [Line Items]
Deferred financing fees	$ 81			$ 61