Vehicle Rental Activities - Schedule of Components of Vehicles (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Property, Plant and Equipment [Abstract]
Rental vehicles	$ 20,204	$ 21,011
Less: Accumulated depreciation	(2,618)	(2,859)
Rental vehicles net, total	17,586	18,152
Vehicles held for sale	361	432
Vehicle, net investment in lease	146	136
Vehicles, net	$ 18,093	$ 18,720