Debt Under Vehicle Programs And Borrowing Arrangements (Schedule Of Debt Under Vehicle Programs) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Newly Issued European Credit Facility	$ 250
Document Period End Date			Sep. 30, 2017
Debt under vehicle programs			$ 10,566	$ 8,878
Debt Due To Avis Budget Rental Car Funding (Member)
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt Instrument, Maturity Date		Sep. 01, 2022
Leasing Vehicles And Related Assets Pledged As Collateralized Debt			8,400
Debt under vehicle programs			6,816	6,733
Deferred Finance Costs, Net			(31)	(38)
Americas Debt Borrowings [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Leasing Vehicles And Related Assets Pledged As Collateralized Debt			1,300
Debt under vehicle programs			947	577
International Debt Borrowings [Domain]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Leasing Vehicles And Related Assets Pledged As Collateralized Debt			3,100
Debt under vehicle programs			2,684	1,449
International Capital Leases [Domain]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Leasing Vehicles And Related Assets Pledged As Collateralized Debt			200
Debt under vehicle programs			159	162
Other (Member)
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Debt under vehicle programs			1	7
Debt Under Vehicle Programs [Member]
Debt Under Vehicle Programs And Borrowing Arrangements [Line Items]
Deferred Finance Costs, Net			$ (41)	$ (50)