Vehicle Rental Activities (Components Of The Company's Vehicles) (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Vehicle Rental Activities [Abstract]
Rental vehicles	$ 12,387	$ 10,937
Less: Accumulated depreciation	(1,360)	(1,454)
Rental Vehicles Net, Total	11,027	9,483
Vehicles held for sale	459	981
Vehicles, net	11,486	$ 10,464
Accounts Payable, Other, Current	546		$ 467
Other Receivables	$ 277		$ 331