Schedule Of Available Funding Under Vehicle Programs (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	$ 8,200
Debt under vehicle programs	$ 9,221	$ 8,878
Avis Budget Rental Car Funding Program [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt, Weighted Average Interest Rate	3.00%	3.00%
Debt Due To Rental Car Funding [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	$ 8,000
Total Capacity	9,296
Debt under vehicle programs	6,516	$ 6,733
Available Capacity	$ 2,780
Americas Debt Borrowings [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt, Weighted Average Interest Rate	3.00%	4.00%
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	$ 900
Total Capacity	924
Debt under vehicle programs	660	$ 577
Available Capacity	$ 264
International Debt Borrowings
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt, Weighted Average Interest Rate	2.00%	2.00%
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	$ 2,300
Total Capacity	2,942
Debt under vehicle programs	1,942	$ 1,449
Available Capacity	1,000
International Capital Leases
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	200
Total Capacity	169
Debt under vehicle programs	146	162
Available Capacity	23
Other
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity	1
Debt under vehicle programs	1	$ 7
Available Capacity	0
Debt Under Vehicle Programs [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity	13,332
Debt under vehicle programs	9,265
Available Capacity	$ 4,067