Commitments and Guarantees - Schedule Of Repurchase Agreements (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Fair value of indemnified securities financing	$ 360,452	$ 320,436
Fair value of cash and securities held by us, as agent, as collateral for indemnified securities financing	377,919	335,420
Fair value of collateral for indemnified securities financing invested in indemnified repurchase agreements	60,003	63,055
Fair value of cash and securities held by us or our agents as collateral for investments in indemnified repurchase agreements	$ 63,959	$ 67,016