Debt under Vehicle Programs and Borrowing Arrangements - Schedule Of Available Funding Under Vehicle Programs (Detail) $ in Millions	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Total Capacity	$ 20,425
Outstanding Borrowings	17,613
Available Capacity	2,812
Americas – Debt due to Avis Budget Rental Car Funding | Affiliated Entity
Debt Instrument [Line Items]
Total Capacity	15,720
Outstanding Borrowings	14,143
Available Capacity	1,577
Americas – Debt due to Avis Budget Rental Car Funding | Affiliated Entity | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	14,000
Americas – Debt borrowings
Debt Instrument [Line Items]
Total Capacity	1,424
Outstanding Borrowings	1,160
Available Capacity	264
Americas – Debt borrowings | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	1,500
International – Debt borrowings
Debt Instrument [Line Items]
Total Capacity	3,031
Outstanding Borrowings	2,159
Available Capacity	872
International – Debt borrowings | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	2,700
International – Finance leases
Debt Instrument [Line Items]
Total Capacity	242
Outstanding Borrowings	143
Available Capacity	99
International – Finance leases | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	200
Other
Debt Instrument [Line Items]
Total Capacity	8
Outstanding Borrowings	8
Available Capacity	$ 0