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Finance Receivables - Troubled Debt Restructurings (Details) - Retail Finance Receivables [Member] - Automobile Loan [Member]
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding recorded investment $ 2,277   $ 2,277   $ 2,228
Less: allowance for loan losses (307)   (307)   (328)
Outstanding recorded investment, net of allowance 1,970   1,970   1,900
Unpaid principal balance 2,313   2,313   $ 2,266
Average outstanding recorded investment 2,238 $ 1,985 2,253 $ 1,966  
Finance charge income recognized $ 62 $ 57 $ 126 $ 117  
Number of loans classified as TDRs during the period | loan 19,662 17,364 33,096 33,838  
Recorded investment of loans classified as TDRs during the period $ 360 $ 302 $ 613 $ 590