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Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 129,210,000,000 $ 129,926,000,000 $ 125,544,000,000
Unamortized premiums and discounts and deferred fees and costs 577,000,000 587,000,000  
Consumer portfolio segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 90,698,000,000 87,240,000,000  
Consumer portfolio segment | Automotive loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 72,898,000,000 70,539,000,000 70,473,000,000
Consumer portfolio segment | Real estate-backed loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 17,800,000,000 16,701,000,000 15,131,000,000
Consumer portfolio segment | Mortgage Finance operations      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 16,485,000,000 15,155,000,000  
Interest-only mortgage loans $ 12,000,000 18,000,000  
Interest Only Mortgage Percentage Beginning Principal Amortization Current Year 34.00%    
Interest Only Mortgage Percentage Beginning Principal Amortization Next Year 41.00%    
Consumer portfolio segment | Mortgage - Legacy      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 1,315,000,000 1,546,000,000  
Interest-only mortgage loans $ 263,000,000 341,000,000  
Interest-only mortgage loans having exited the interest-only period 99.00%    
Commercial portfolio segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 38,512,000,000 42,686,000,000 $ 39,940,000,000
Commercial portfolio segment | Automotive loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 29,382,000,000 33,672,000,000  
Commercial portfolio segment | Real estate-backed loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 4,777,000,000 4,809,000,000  
Commercial portfolio segment | Other loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 4,353,000,000 $ 4,205,000,000