Schedule Of Available Funding Under Vehicle Programs (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	$ 6,400
Debt under vehicle programs	$ 6,857	$ 11,068
Avis Budget Rental Car Funding Program [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt, Weighted Average Interest Rate	3.17%	3.16%
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	7,921
Debt under vehicle programs	5,116	$ 7,975
Available Capacity	$ 2,805
Americas Debt Borrowings [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt, Weighted Average Interest Rate	2.98%	2.87%
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	$ 900
Total Capacity	759
Debt under vehicle programs	509	$ 827
Available Capacity	$ 250
International Debt Borrowings
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt, Weighted Average Interest Rate	2.17%	1.87%
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	$ 2,300
Total Capacity	2,884
Debt under vehicle programs	1,115	$ 2,100
Available Capacity	1,769
International Capital Leases
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Leasing Vehicles And Related Assets Pledged As Collateralized Debt	200
Total Capacity	221
Debt under vehicle programs	162	$ 215
Available Capacity	59
Debt Under Vehicle Programs [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Total Capacity	11,785
Debt under vehicle programs	6,902
Available Capacity	$ 4,883