Leased Vehicles - Summary of Leased Vehicles (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Property Subject to or Available for Operating Lease, Net [Abstract]
Leased vehicles	$ 44,147	$ 27,587
Manufacturer incentives	(7,039)	(4,582)
Leased vehicles accounted for operating leases net of manufacturing incentives	37,108	23,005
Less: accumulated depreciation	(5,333)	(2,833)
Leased vehicles, net	$ 31,775	$ 20,172