Commitments and Guarantees - Schedule Of Repurchase Agreements (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Fair value of indemnified securities financing	$ 379,052	$ 367,901
Fair value of cash and securities held by us, as agent, as collateral for indemnified securities financing	398,076	385,428
Fair value of collateral for indemnified securities financing invested in indemnified repurchase agreements	49,502	45,658
Fair value of cash and securities held by us or our agents as collateral for investments in indemnified repurchase agreements	$ 53,051	$ 48,887