Leased Vehicles - Leased Vehicles (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Abstract]
Leased vehicles	$ 54,821	$ 58,915
Manufacturer subvention	(7,398)	(8,915)
Net capitalized cost	47,423	50,000
Less: accumulated depreciation	(9,494)	(10,181)
Leased vehicles, net	37,929	39,819	$ 42,100
Depreciation expense	$ 6,100	$ 7,200	$ 7,300