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Trading Assets and Liabilities - Trading Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets $ 38,322 $ 38,800
Trading liabilities 20,875 14,186
U.S. Treasury [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 2,283 259
US Government Agency Issued or Guaranteed [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 292 14
US Government sponsored enterprises [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 231 24
Asset backed securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 987 1,032
Corporate and foreign bonds [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 9,636 11,577
Other securities [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 37 40
Precious metals trading [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 15,777 17,082
Trading liabilities 6,853 6,999
Derivative [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading assets 9,079 8,772
Trading liabilities 13,661 6,844
Securities Sold, Not yet Purchased [Member]
   
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Trading liabilities $ 361 $ 343