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Loans Held for Sale - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Fair Value Of Leverage Acquisition Financing Loans Held For Sale $ 3   $ 3     $ 465    
Fair value of commercial real estate loans held for sale 17   17     16    
Residential mortgage loans held for sale include subprime residential mortgage loans at fair value 54   54     52    
Valuation allowance on loans helf for sale 605 619 605 619 568 647 603 743
Gain On Trading Related Revenue Associated With This Economic Hedging Program (4) (3) (4)          
Gain (loss) on trading related revenue associated with this economic hedging program       4        
Consumer Loans [Member]
               
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Valuation allowance on loans helf for sale $ 95   $ 95     $ 114