Vehicle Rental Activities (Components Of The Company's Vehicles) (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Vehicle Rental Activities [Abstract]
Rental vehicles	$ 15,188	$ 11,652
Less: Accumulated depreciation	(1,629)	(1,652)
Rental Vehicles Net, Total	13,559	10,000
Vehicles held for sale	308	626
Vehicles, net	13,867	$ 10,626
Accounts Payable, Other, Current	856		$ 658
Other Receivables	$ 248		$ 235