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