Commitments and Guarantees - Schedule Of Repurchase Agreements (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Fair value of indemnified securities financing	$ 330,821	$ 349,766
Fair value of cash and securities held by us, as agent, as collateral for indemnified securities financing	341,789	364,411
Fair value of collateral for indemnified securities financing invested in indemnified repurchase agreements	78,407	85,309
Fair value of cash and securities held by us or our agents as collateral for investments in indemnified repurchase agreements	$ 82,582	$ 90,819