Debt Under Vehicle Programs and Borrowing Arrangements - Schedule of Available Funding Under the Vehicle Programs (Details) $ in Millions	Mar. 31, 2026 USD ($)
Debt Instrument [Line Items]
Total Capacity	$ 21,378
Outstanding Borrowings	18,468
Available Capacity	2,910
Americas - Debt due to Avis Budget Rental Car Funding | Affiliated Entity
Debt Instrument [Line Items]
Total Capacity	15,358
Outstanding Borrowings	13,653
Available Capacity	1,705
Americas - Debt due to Avis Budget Rental Car Funding | Affiliated Entity | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	13,900
Americas - Debt borrowings
Debt Instrument [Line Items]
Total Capacity	2,350
Outstanding Borrowings	2,209
Available Capacity	141
Americas - Debt borrowings | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	2,500
International - Debt borrowings
Debt Instrument [Line Items]
Total Capacity	3,511
Outstanding Borrowings	2,476
Available Capacity	1,035
International - Debt borrowings | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	3,100
International - Finance leases
Debt Instrument [Line Items]
Total Capacity	159
Outstanding Borrowings	130
Available Capacity	29
International - Finance leases | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	$ 100