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Finance Receivables - Troubled Debt Restructurings (Details) - Automobile Loan [Member]
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Outstanding recorded investment $ 2,228 $ 1,920  
Less: allowance for loan losses (328) (276)  
Outstanding recorded investment, net of allowance 1,900 1,644  
Unpaid principal balance 2,266 1,967  
Average outstanding recorded investment 2,074 1,766 $ 1,455
Finance charge income recognized $ 228 $ 205 $ 164
Number of loans classified as TDRs during the period | loan 74,784 66,926 58,012
Recorded investment of loans classified as TDRs during the period $ 1,309 $ 1,148 $ 982