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Finance Receivables - Troubled Debt Restructurings (Details) - Retail Finance Receivables [Member] - Automobile Loan [Member]
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding recorded investment $ 2,308   $ 2,308   $ 2,228
Less: allowance for loan losses (317)   (317)   (328)
Outstanding recorded investment, net of allowance 1,991   1,991   1,900
Unpaid principal balance 2,341   2,341   $ 2,266
Average outstanding recorded investment 2,293 $ 2,091 2,268 $ 2,045  
Finance charge income recognized $ 59 $ 56 $ 185 $ 173  
Number of loans classified as TDRs during the period | loan 17,924 23,015 51,020 56,853  
Recorded investment of loans classified as TDRs during the period $ 319 $ 407 $ 932 $ 997