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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Affiliated Entity [Member]          
Related Party Transaction [Line Items]          
Finance receivables, net due $ 96   $ 96   $ 0
Subvention receivable 338   338   347
Leased vehicle subvention earned 786 $ 591 2,246 $ 1,588  
Affiliated Entity [Member] | Retail Finance Receivables [Member]          
Related Party Transaction [Line Items]          
Interest subvention earned 115 90 319 245  
Affiliated Entity [Member] | Commercial Finance Receivables [Member]          
Related Party Transaction [Line Items]          
Finance receivables, net due 349   349   347
Commercial loan funding payable 251   251   $ 320
Interest subvention earned 14 13 42 35  
Parent Company [Member]          
Related Party Transaction [Line Items]          
Revenue from related parties $ 1,100 $ 1,000 $ 3,300 $ 3,200