Commitments, Pledged Assets, Collateral and Contingencies (Details 1) (USD $) In Billions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Pledged assets and Collateral
Financial instruments pledged by the Firm that may not be sold or repledged by the secured parties	$ 291.7	$ 270.3
Significant components of assets pledged
Significant components of assets pledged as collateral, fair value	472.8	456.2
Collateral Received that Can be Resold or Repledged
Assets accepted by the Firm as collateral that it could sell or repedge, deliver or otherwise use at fair value	825.7	742.1
Assets accepted by the Firm as collateral that the Firm has sold or repledged	546.8	515.8
Securities
Significant components of assets pledged
Significant components of assets pledged as collateral, fair value	110.1	134.8
Loans
Significant components of assets pledged
Significant components of assets pledged as collateral, fair value	207.2	198.6
Trading assets
Significant components of assets pledged
Significant components of assets pledged as collateral, fair value	$ 155.5	$ 122.8