Leased Vehicles - Leased Vehicles Summary (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Leased Vehicles Accounted For Operating Leases, Net [Roll Forward]
Balance at beginning of period	$ 8,268	$ 4,025	$ 1,976
International operations acquisition	0	0	5
Leased vehicles purchased	20,199	6,169	2,830
Leased vehicles returned - end of term	(1,785)	(878)	(343)
Leased vehicles returned - default	(120)	(58)	(28)
Manufacturing incentives	(3,169)	(844)	(360)
Foreign currency translation	(388)	(146)	(55)
Balance at end of period	$ 23,005	$ 8,268	$ 4,025