Vehicle Rental Activities (Components Of The Company's Vehicles) (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Property, Plant and Equipment [Abstract]
Rental vehicles	$ 13,164	$ 9,210
Less: Accumulated depreciation	(1,528)	(1,337)
Rental Vehicles Net, Total	11,636	7,873
Vehicles held for sale	92	280
Vehicles, net	11,728	$ 8,153
Liabilities under vehicle programs	485		$ 150
Other receivables	$ 104		$ 419