Variable Interest Entities - Assets and Liabilities of Consolidated VIE's (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Restricted cash	$ 1,856	$ 2,071
Finance receivables, net	34,385	33,000
Leased vehicles assets	12,904	7,060
Securitization and Credit Facility VIEs [Member]
Variable Interest Entity [Line Items]
Restricted cash	1,818	1,721
Finance receivables, net	23,859	23,109
Leased vehicles assets	6,877	4,595
Secured debt	$ 24,651	$ 22,794