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Finance Receivables And Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net $ 100,328,000,000 $ 99,055,000,000  
Interest and Fee Income, Loans and Leases 4,529,000,000 4,539,000,000 4,189,000,000
Held For Investment Mortgage Finance Receivables Interest Only Mortgage Loans 1,500,000,000 2,100,000,000  
Loans Receivable, Fair Value Disclosure 1,000,000 0  
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 595,000,000 895,000,000  
Consumer Loans Auto Financing Receivable [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 56,417,000,000 53,715,000,000  
Residential Mortgage [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net   9,821,000,000  
Commercial Loan [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 35,467,000,000 35,519,000,000  
Commercial And Industrial Automobile [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 30,948,000,000 30,270,000,000  
Commercial And Industrial Mortgage [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 0 0  
Commercial And Industrial Other [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 1,664,000,000 2,697,000,000  
Commercial Real Estate Automobile [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 2,855,000,000 2,552,000,000  
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Hedged Item [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest and Fee Income, Loans and Leases 2,000,000 0 0
Fair Value Option Election, Fair Value [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 100,328,000,000    
Fair Value Option Election, Fair Value [Member] | Residential Mortgage [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables and loans, net 8,444,000,000    
Fair Value Option Election, Fair Value [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Gain (Loss) Recognized in Earnings on Hedged Item [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest and Fee Income, Loans and Leases $ 1,000,000