Segment Reporting and Geographic Information - Operations Reporting by Assets (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Finance receivables, net	$ 36,781	$ 33,000
Leased vehicles, net	20,172	7,060	$ 3,400
Total assets	65,904	47,608
North America [Member]
Segment Reporting Information [Line Items]
Finance receivables, net	21,558	15,943
Leased vehicles, net	20,086	7,029
Total assets	47,419	27,586
International [Member]
Segment Reporting Information [Line Items]
Finance receivables, net	15,223	17,057
Leased vehicles, net	86	31
Total assets	$ 18,485	$ 20,022