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Trading Assets and Liabilities - Trading Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets $ 27,336 $ 28,894
Trading liabilities 9,349 10,875
U.S. Treasury [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 2,140 1,344
US Government agency issued or guaranteed [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 17 19
US Government sponsored enterprises [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 64 [1] 159 [1]
Obligations of U.S. states and political subdivision [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 25 25
Asset backed securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 484 481
Corporate and foreign bonds [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 10,265 [2] 9,099 [2]
Other securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 21 25
Precious metals [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 10,332 11,751
Trading liabilities 3,926 3,826
Derivatives [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 3,988 5,991
Trading liabilities 4,989 6,741
Securities sold, not yet purchased [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading liabilities $ 434 $ 308
[1] Includes mortgage backed securities of $38 million and $133 million issued or guaranteed by the Federal National Mortgage Association ("FNMA") and $26 million and $26 million issued or guaranteed by the Federal Home Loan Mortgage Corporation ("FHLMC") at March 31, 2014 and December 31, 2013, respectively.
[2] .