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Pledged Assets and Collateral (Details 1) (USD $)
In Billions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Collateral Received that Can be Resold or Repledged    
Financial instruments pledged by the Firm that may not be sold or repledged by the secured parties $ 292.8 $ 291.7
Assets accepted by the Firm as collateral that it could sell or repledge, deliver or otherwise use at fair value 723.7 757.1
Assets accepted by the Firm as collateral that the Firm has sold or repledged $ 598.6 $ 545.0