Vehicle Rental Activities (Components of the Company's Vehicles) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Rental vehicles	$ 19,918	$ 20,094
Less: Accumulated depreciation	(2,777)	(3,143)
Rental Vehicles Net, Total	17,141	16,951
Vehicles held for sale	301	594
Vehicle, net investment in lease	80	74
Vehicles, net	$ 17,522	$ 17,619