Vehicle Rental Activities (Components of the Company's Vehicles) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Property, Plant and Equipment [Abstract]
Rental vehicles	$ 22,725	$ 17,819
Less: Accumulated depreciation	(2,407)	(2,211)
Rental Vehicles Net, Total	20,318	15,608
Vehicles held for sale	276	317
Vehicle, net investment in lease	31	36
Vehicles, net	20,625	$ 15,961
Liabilities under vehicle programs	443		$ 249
Other receivables	$ 140		$ 74