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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Affiliated Entity [Member]          
Related Party Transaction [Line Items]          
Subvention receivable $ 735   $ 735   $ 306
Leased vehicle subvention earned 813 $ 754 1,611 $ 1,460  
Affiliated Entity [Member] | Retail Finance Receivables [Member]          
Related Party Transaction [Line Items]          
Finance receivables, net due 120   120   88
Interest subvention earned 122 109 234 204  
Affiliated Entity [Member] | Commercial Finance Receivables [Member]          
Related Party Transaction [Line Items]          
Finance receivables, net due 379   379   355
Commercial loan funding payable 75   75   $ 90
Interest subvention earned 15 13 33 28  
Parent Company [Member]          
Related Party Transaction [Line Items]          
Revenue from related parties $ 1,100 $ 1,200 $ 1,700 $ 2,200