Vehicle Rental Activities (Components Of The Company's Vehicles) (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Vehicle Rental Activities [Abstract]
Rental vehicles	$ 12,993	$ 10,937
Less: Accumulated depreciation	(1,627)	(1,454)
Rental Vehicles Net, Total	11,366	9,483
Vehicles held for sale	435	981
Vehicles, net	11,801	$ 10,464
Accounts Payable, Other, Current	231		$ 164
Other Receivables	$ 707		$ 586