Vehicle Rental Activities (Components Of The Company's Vehicles) (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Property, Plant and Equipment [Abstract]
Rental vehicles	$ 10,251	$ 9,210
Less: Accumulated depreciation	(1,288)	(1,337)
Rental Vehicles Net, Total	8,963	7,873
Vehicles held for sale	138	280
Vehicles, net	9,101	$ 8,153
Liabilities under vehicle programs	344		$ 240
Other receivables	$ 195		$ 491