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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, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Outstanding recorded investment $ 2,390   $ 2,390   $ 2,348
Less: allowance for loan losses (337)   (337)   (321)
Outstanding recorded investment, net of allowance 2,053   2,053   2,027
Unpaid principal balance 2,416   2,416   $ 2,379
Average outstanding recorded investment 2,372 $ 2,293 2,369 $ 2,268  
Finance charge income recognized $ 60 $ 59 $ 191 $ 185  
Number of loans classified as TDRs during the period | loan 19,074 17,924 53,013 51,020  
Recorded investment of loans classified as TDRs during the period $ 343 $ 319 $ 969 $ 932