Schedule Of Available Funding Under Vehicle Programs (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	$ 9,000
Debt under vehicle programs	$ 10,232	$ 9,221
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	8,883
Debt under vehicle programs	7,393	$ 6,516
Available Capacity	$ 1,490
Americas Debt Borrowings [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt, Weighted Average Interest Rate	3.00%
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	$ 900
Total Capacity	947
Debt under vehicle programs	635	$ 660
Available Capacity	$ 312
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	3,071
Debt under vehicle programs	2,060	$ 1,942
Available Capacity	1,011
International Capital Leases
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	200
Total Capacity	209
Debt under vehicle programs	191	146
Available Capacity	18
Other
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity	2
Debt under vehicle programs	2	$ 1
Available Capacity	0
Debt Under Vehicle Programs [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity	13,112
Debt under vehicle programs	10,281
Available Capacity	$ 2,831