Vehicle Rental Activities (Components Of The Company's Vehicles) (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Vehicle Rental Activities [Abstract]
Rental vehicles	$ 13,601	$ 12,548
Less: Accumulated depreciation	(1,480)	(1,670)
Rental Vehicles Net, Total	12,121	10,878
Vehicles held for sale	464	596
Vehicles, net	12,585	$ 11,474
Accounts Payable, Other, Current	632		$ 641
Other Receivables	$ 474		$ 329