Vehicle Rental Activities (Components Of The Company's Vehicles) (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Vehicle Rental Activities [Abstract]
Rental vehicles	$ 9,826	$ 13,461
Less: Accumulated depreciation	(1,331)	(1,621)
Rental Vehicles Net, Total	8,495	11,840
Vehicles held for sale	285	337
Vehicles, net	8,780	$ 12,177
Accounts Payable, Other, Current	213		$ 297
Other Receivables	$ 357		$ 693