Debt Under Vehicle Programs and Borrowing Arrangements - Schedule of Debt Under Vehicle Programs (Details) £ in Millions, $ in Millions, € in Billions	Mar. 31, 2026 USD ($)	Feb. 28, 2026 EUR (€)	Feb. 28, 2026 GBP (£)	Dec. 31, 2025 USD ($)
Debt Instrument [Line Items]
Debt under vehicle programs	$ 18,391			$ 19,188
Deferred financing fees related to debt	52			56
Americas - Debt due to Avis Budget Rental Car Funding
Debt Instrument [Line Items]
Debt under vehicle programs	13,653			14,447
Debt Due To Rental Car Funding, Class R Notes
Debt Instrument [Line Items]
Debt under vehicle programs	736			826
Americas - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	2,209			2,202
International - Debt borrowings
Debt Instrument [Line Items]
Debt under vehicle programs	2,476			2,480
International - Finance leases
Debt Instrument [Line Items]
Debt under vehicle programs	130			130
Other
Debt Instrument [Line Items]
Debt under vehicle programs	0			0
Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees	(77)			(71)
Repurchase Facility
Debt Instrument [Line Items]
Debt under vehicle programs	258
Debt issued	783			965
European Rental Fleet Securitization
Debt Instrument [Line Items]
Debt under vehicle programs		€ 2.1	£ 250
Avis Budget Rental Car Funding | Deferred financing fees
Debt Instrument [Line Items]
Deferred financing fees related to debt	$ 50			$ 51