v2.4.0.6
Collateralized Transactions (Narrative) (Details) (USD $)
In Billions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Customer margin loans outstanding $ 17.2 $ 16.2
Fair value of financial instruments received as collateral where the Company is permitted to sell or repledge the securities 577 488
Fair value of financial instruments received as collateral where the Company has sold or repledged $ 420 $ 335