Vehicle Rental Activities (Components of the Company's Vehicles) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Rental vehicles	$ 23,633	$ 23,114
Less: Accumulated depreciation	(2,982)	(2,639)
Rental Vehicles Net, Total	20,651	20,475
Vehicles held for sale	602	734
Vehicle, net investment in lease	99	31
Vehicles, net	$ 21,352	$ 21,240