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Finance Receivables And Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 111,600 $ 99,948  
Interest and Fee Income, Loans and Leases 4,570 4,457 $ 4,529
Loans and Finance Receivables [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (110) 266  
Fair Value Option Election, Fair Value [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 111,600 99,948  
Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Hedged Item [Member] | Interest Rate Contract [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest and Fee Income, Loans and Leases (39) (34) $ (2)
Consumer Portfolio Segment [Member] | Consumer Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 74,065 64,044  
Consumer Portfolio Segment [Member] | Automobile Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 64,292 56,570  
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Hedged Item [Member] | Fair Value Option Election, Fair Value [Member] | Interest Rate Contract [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest and Fee Income, Loans and Leases 66 35  
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 9,773 7,474  
Consumer Portfolio Segment [Member] | Mortgage Finance [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 6,413 3,504  
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans $ 44 55  
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | One year or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 7.00%    
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Two years or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 3.00%    
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Three years or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 0.00%    
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Four years or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 39.00%    
Consumer Portfolio Segment [Member] | Mortgage Finance [Member] | Five years or greater [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 38.00%    
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 3,360 3,970  
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans $ 941 1,100  
Loans Receivable, Fair Value Disclosure   1  
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | One year or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 35.00%    
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Two years or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 22.00%    
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Three years or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 2.00%    
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Four years or less [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 0.00%    
Consumer Portfolio Segment [Member] | Mortgage - Legacy [Member] | Five years or greater [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest-only mortgage loan portfolio principal amortization 1.00%    
Commercial Portfolio Segment [Member] | Commercial Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 37,535 35,904  
Commercial Portfolio Segment [Member] | Commercial And Industrial Automobile [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 31,469 30,871  
Commercial Portfolio Segment [Member] | Commercial And Industrial Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 2,640 1,882  
Commercial Portfolio Segment [Member] | Commercial Real Estate Automobile [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 3,426 $ 3,151