Annual report pursuant to Section 13 and 15(d)

VIEs - Narrative (Details)

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VIEs - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Variable Interest Entity [Line Items]      
Maximum year to defer payment of interest on Debenture     5 years
Trust 2016 Unconsolidated      
Variable Interest Entity [Line Items]      
Total of automobile loans transferred In securitization transaction $ 1,500    
2015-1 Automobile Trust      
Variable Interest Entity [Line Items]      
Total of automobile loans transferred In securitization transaction   $ 750