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Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 126,605 $ 122,893 $ 118,871
Loans and finance receivables      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unamortized premiums and discounts and deferred fees and costs 606 551  
Consumer portfolio segment | Consumer loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 86,501 81,821  
Consumer portfolio segment | Automobile loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 69,995 68,071 67,077
Consumer portfolio segment | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 16,506 13,750 12,015
Consumer portfolio segment | Mortgage Finance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 14,840 11,657  
Interest-only mortgage loans $ 16 20  
Consumer portfolio segment | Mortgage Finance | 2019, or sooner      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 38.00%    
Consumer portfolio segment | Mortgage Finance | 2020, or sooner      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 45.00%    
Consumer portfolio segment | Mortgage - Legacy      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 1,666 2,093  
Interest-only mortgage loans $ 381 496  
Interest-only mortgage loans having exited the interest-only period 99.00%    
Commercial portfolio segment | Commercial loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 40,104 41,072 $ 39,779
Commercial portfolio segment | Commercial and industrial automotive      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 31,424 33,025  
Commercial portfolio segment | Commercial and industrial other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 4,132 3,887  
Commercial portfolio segment | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 4,548 $ 4,160