Commitments and Guarantees - Schedule Of Repurchase Agreements (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Fair value of indemnified securities financing	$ 348,960	$ 349,766
Fair value of cash and securities held by us, as agent, as collateral for indemnified securities financing	364,212	364,411
Fair value of collateral for indemnified securities financing invested in indemnified repurchase agreements	78,163	85,309
Fair value of cash and securities held by us or our agents as collateral for investments in indemnified repurchase agreements	$ 83,256	$ 90,819