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Finance Receivables - Finance Receivables, net (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Finance receivables, net $ 40,864 $ 33,475
Fair value of finance receivables 40,957 33,528
Commercial Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total finance receivables 9,495 7,880
Automobile Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Deferred income 282 178
Automobile Loan [Member] | Retail Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated for impairment, net of fees 30,147 24,480
Individually evaluated for impairment, net of fees 2,170 1,920
Total finance receivables 32,317 26,400
Less: allowance for loan losses - collective (571) (489)
Less: allowance for loan losses - specific (328) (276)
Total finance receivables, net 31,418 25,635
Automobile Loan [Member] | Commercial Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Collectively evaluated for impairment, net of fees 9,468 7,853
Individually evaluated for impairment, net of fees 27 27
Total finance receivables 9,495 7,880
Less: allowance for loan losses - collective (46) (36)
Less: allowance for loan losses - specific (3) (4)
Total finance receivables, net $ 9,446 $ 7,840