Leased Vehicles - Summary of Leased Vehicles (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Property Subject to or Available for Operating Lease, Net [Abstract]
Leased vehicles	$ 22,913	$ 9,747
Manufacturer incentives	(3,764)	(1,479)
Leased vehicles accounted for operating leases net of manufacturing incentives	19,149	8,268
Less: accumulated depreciation	(2,234)	(1,208)
Leased vehicles, net	$ 16,915	$ 7,060