Vehicle Rental Activities (Components of the Company's Vehicles) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Rental vehicles	$ 24,665	$ 23,114
Less: Accumulated depreciation	(2,703)	(2,639)
Rental Vehicles Net, Total	21,962	20,475
Vehicles held for sale	432	734
Vehicle, net investment in lease	80	31
Vehicles, net	$ 22,474	$ 21,240