Debt Under Vehicle Programs and Borrowing Arrangements (Schedule of Available Funding Under the Vehicle Programs) (Details) $ in Millions	Mar. 31, 2025 USD ($)
Debt Instrument [Line Items]
Total Capacity	$ 20,309
Outstanding Borrowings	17,311
Available Capacity	2,998
Americas - Debt due to Avis Budget Rental Car Funding | Affiliated Entity
Debt Instrument [Line Items]
Total Capacity	15,576
Outstanding Borrowings	13,851
Available Capacity	1,725
Americas - Debt due to Avis Budget Rental Car Funding | Affiliated Entity | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	14,300
Americas - Debt borrowings
Debt Instrument [Line Items]
Total Capacity	1,412
Outstanding Borrowings	1,127
Available Capacity	285
Americas - Debt borrowings | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	1,400
International - Debt borrowings
Debt Instrument [Line Items]
Total Capacity	3,166
Outstanding Borrowings	2,203
Available Capacity	963
International - Debt borrowings | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	2,800
International - Finance leases
Debt Instrument [Line Items]
Total Capacity	155
Outstanding Borrowings	130
Available Capacity	25
International - Finance leases | Secured Debt
Debt Instrument [Line Items]
Outstanding Borrowings	$ 200