Vehicle Rental Activities (Components Of The Company's Vehicles) (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Vehicle Rental Activities [Abstract]
Rental vehicles	$ 13,001	$ 13,461
Less: Accumulated depreciation	(1,429)	(1,621)
Rental Vehicles Net, Total	11,572	11,840
Vehicles held for sale	1,243	337
Vehicles, net	12,815	$ 12,177
Accounts Payable, Other, Current	240		$ 632
Other Receivables	$ 491		$ 474