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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Affiliated Entity [Member]          
Related Party Transaction [Line Items]          
Subvention receivable $ 735   $ 735   $ 306
Leased vehicle subvention earned 827 $ 786 2,438 $ 2,246  
Affiliated Entity [Member] | Retail Finance Receivables [Member]          
Related Party Transaction [Line Items]          
Finance receivables, net due 125   125   88
Interest subvention earned 125 115 359 319  
Affiliated Entity [Member] | Commercial Finance Receivables [Member]          
Related Party Transaction [Line Items]          
Finance receivables, net due 437   437   355
Commercial loan funding payable 86   86   $ 90
Interest subvention earned 17 14 50 42  
Parent Company [Member]          
Related Party Transaction [Line Items]          
Revenue from related parties $ 1,100 $ 1,100 $ 2,800 $ 3,300