Debt Under Vehicle Programs And Borrowing Arrangements (Schedule Of Available Funding Under The Vehicle Programs) (Detail) $ in Millions	Sep. 30, 2017 USD ($)
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity (a)	$ 13,167
Outstanding Borrowings	10,607
Available Capacity	2,560
Debt Due To Avis Budget Rental Car Funding (Member)
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity (a)	9,106
Outstanding Borrowings	6,816
Available Capacity	2,290
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	8,400
Americas Debt Borrowings [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity (a)	974
Outstanding Borrowings	947
Available Capacity	27
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	1,300
International Debt Borrowings [Domain]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity (a)	2,897
Outstanding Borrowings	2,684
Available Capacity	213
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	3,100
International Capital Leases [Domain]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity (a)	189
Outstanding Borrowings	159
Available Capacity	30
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	200
Other (Member)
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity (a)	1
Outstanding Borrowings	1
Available Capacity	$ 0