Pledged assets and collateral (Details) - USD ($) $ in Billions	Jun. 30, 2015	Dec. 31, 2014
Pledged assets and Collateral
Financial instruments pledged by the Firm that may not be sold or repledged by the secured parties	$ 56.8	$ 60.1
Assets accepted by the Firm as collateral that it could sell or repedge, deliver or otherwise use at fair value	775.0	761.7
Assets accepted by the Firm as collateral that the Firm has sold or repledged	617.7	596.8
Assets pledged to Federal Reserve Banks and Federal Home Loan Banks
Pledged assets and Collateral
Pledged assets	$ 383.4	$ 324.5