v2.3.0.11
Collateralized Transactions (Narrative) (Details) (USD $)
In Billions
Jun. 30, 2011
Dec. 31, 2010
Collateralized Transactions    
Customer margin loans outstanding $ 20.7 $ 18.0
Fair value of financial instruments received as collateral where the Company is permitted to sell or repledge the securities 585 537
Fair value of financial instruments received as collateral where the Company has sold or repledged $ 416 $ 390