Vehicle Rental Activities (Components Of The Company's Vehicles) (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Vehicle Rental Activities [Abstract]
Rental vehicles	$ 13,418	$ 11,652
Less: Accumulated depreciation	(1,701)	(1,652)
Rental Vehicles Net, Total	11,717	10,000
Vehicles held for sale	446	626
Vehicles, net	12,163	$ 10,626
Accounts Payable, Other, Current	269		$ 231
Other Receivables	$ 757		$ 707