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Guarantee Arrangements and Pledged Assets (Details 1) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Carrying (Fair) Value [Member]
   
Net credit derivative positions    
Sell-protection credit derivative positions $ 4,299 $ (7,759)
Buy-protection credit derivative positions 4,383 8,131
Net position 84 372
Notional [Member]
   
Net credit derivative positions    
Sell-protection credit derivative positions 290,401 330,395
Buy-protection credit derivative positions 280,613 326,882
Net position $ 9,788 $ 3,513