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Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 130,055 $ 129,926 $ 125,327
Loans and finance receivables      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unamortized premiums and discounts and deferred fees and costs 584 587  
Consumer portfolio segment | Consumer loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 89,211 87,240  
Consumer portfolio segment | Automobile loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 71,553 70,539 69,318
Consumer portfolio segment | Residential mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 17,658 16,701 14,683
Consumer portfolio segment | Mortgage Finance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 16,225 15,155  
Interest-only mortgage loans $ 17 18  
Consumer portfolio segment | Mortgage Finance | 2019, or sooner      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 33.00%    
Consumer portfolio segment | Mortgage Finance | 2020, or sooner      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 40.00%    
Consumer portfolio segment | Mortgage - Legacy      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 1,433 1,546  
Interest-only mortgage loans $ 305 341  
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 $ 40,844 42,686 $ 41,326
Commercial portfolio segment | Commercial and industrial automotive      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 31,559 33,672  
Commercial portfolio segment | Commercial and industrial other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 4,516 4,205  
Commercial portfolio segment | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 4,769 $ 4,809