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Loans Held for Sale - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Commercial leveraged acquisition finance loans $ 1   $ 1     $ 465    
Fair value of commercial real estate loans held for sale 41   41     16    
Residential mortgage loans held for sale include subprime residential mortgage loans at fair value 48   48     52    
Valuation allowance on loans helf for sale 595 637 595 637 605 647 619 743
Losses On Trading Related Revenue Associated With This Economic Hedging Program 9 4 5          
Gain on trading related revenue associated with this economic hedging program       0        
Consumer Loans [Member]
               
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Valuation allowance on loans helf for sale $ 81   $ 81     $ 114