Variable Interest Entities - Assets and Liabilities of Consolidated VIE's (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Restricted cash	$ 1,928	$ 2,071
Finance receivables, net	35,074	33,000
Leased vehicles assets	16,915	7,060
Securitization and Credit Facility VIEs [Member]
Variable Interest Entity [Line Items]
Restricted cash	1,886	1,721
Finance receivables, net	25,746	23,109
Leased vehicles assets	7,202	4,595
Secured debt	$ 26,916	$ 22,794