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Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 118,028,000,000 $ 128,231,000,000 $ 128,609,000,000
Unamortized premiums and discounts and deferred fees and costs 2,100,000,000    
Consumer portfolio segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 90,160,000,000 89,924,000,000  
Consumer portfolio segment | Automotive loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 73,761,000,000 72,390,000,000 73,071,000,000
Consumer portfolio segment | Real estate-backed loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 16,072,000,000 17,322,000,000 17,010,000,000
Consumer portfolio segment | Mortgage Finance operations      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 15,168,000,000 16,181,000,000  
Interest-only mortgage loans 8,000,000 11,000,000  
Consumer portfolio segment | Mortgage - Legacy      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 904,000,000 1,141,000,000  
Interest-only mortgage loans $ 156,000,000 212,000,000  
Interest-only mortgage loans having exited the interest-only period 99000000.00%    
Consumer portfolio segment | Other loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 327,000,000 212,000,000  
Loans receivable, fair value 8,000,000 11,000,000  
Commercial portfolio segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 27,868,000,000 38,307,000,000 $ 38,528,000,000
Commercial portfolio segment | Automotive loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 17,886,000,000 28,332,000,000  
Commercial portfolio segment | Real estate-backed loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 4,851,000,000 4,961,000,000  
Commercial portfolio segment | Other loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 5,131,000,000 5,014,000,000  
Finance receivables and loans, net      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest receivable $ 711,000,000 $ 488,000,000