Debt Under Vehicle Programs And Borrowing Arrangements (Schedule Of Available Funding Under The Vehicle Programs) (Detail) $ in Millions	Sep. 30, 2018 USD ($)
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity (a)	$ 12,909
Outstanding Borrowings (b)	10,970
Available Capacity	1,939
Debt Due To Avis Budget Rental Car Funding (Member)
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity (a)	8,629
Outstanding Borrowings (b)	7,154
Available Capacity	1,475
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	8,700
Americas Debt Borrowings [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity (a)	978
Outstanding Borrowings (b)	855
Available Capacity	123
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	1,200
International Debt Borrowings [Domain]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity (a)	3,072
Outstanding Borrowings (b)	2,753
Available Capacity	319
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	3,000
International Capital Leases [Domain]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity (a)	223
Outstanding Borrowings (b)	201
Available Capacity	22
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	200
Other (Member)
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity (a)	7
Outstanding Borrowings (b)	7
Available Capacity	$ 0