Debt Under Vehicle Programs and Borrowing Arrangements (Schedule of Available Funding Under the Vehicle Programs) (Details) $ in Millions	Sep. 30, 2024 USD ($)
Debt Instrument [Line Items]
Total Capacity	$ 21,964
Outstanding Borrowings	17,977
Available Capacity	3,987
Americas - Debt due to Avis Budget Rental Car Funding | Affiliated Entity
Debt Instrument [Line Items]
Total Capacity	16,848
Outstanding Borrowings	13,903
Available Capacity	2,945
Americas - Debt due to Avis Budget Rental Car Funding | Affiliated Entity | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	17,000
Americas - Debt borrowings
Debt Instrument [Line Items]
Total Capacity	1,486
Outstanding Borrowings	1,213
Available Capacity	273
Americas - Debt borrowings | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	1,900
International - Debt borrowings
Debt Instrument [Line Items]
Total Capacity	3,357
Outstanding Borrowings	2,672
Available Capacity	685
International - Debt borrowings | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	3,400
International - Finance leases
Debt Instrument [Line Items]
Total Capacity	263
Outstanding Borrowings	179
Available Capacity	84
International - Finance leases | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	200
Other
Debt Instrument [Line Items]
Total Capacity	10
Outstanding Borrowings	10
Available Capacity	$ 0