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Related Party Transactions - Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Affiliated Entity [Member]          
Related Party Transaction [Line Items]          
Subvention receivable $ 705   $ 705   $ 727
Leased vehicle subvention earned 818 $ 813 1,653 $ 1,611  
Affiliated Entity [Member] | Retail Finance Receivables [Member]          
Related Party Transaction [Line Items]          
Finance receivables, net due 108   108   134
Interest subvention earned 133 122 264 234  
Affiliated Entity [Member] | Commercial Finance Receivables [Member]          
Related Party Transaction [Line Items]          
Finance receivables, net due 491   491   445
Commercial loan funding payable 66   66   $ 61
Interest subvention earned 14 15 31 33  
Parent Company [Member]          
Related Party Transaction [Line Items]          
Revenue from related parties $ 900 $ 1,100 $ 2,000 $ 1,700