Commitments and Guarantees - Contractual Amounts of Credit-Related Off-Balance Sheet Financial Instruments (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Unfunded credit facilities	$ 34,969	$ 34,213
Indemnified securities financing	421,862	440,875
Standby letters of credit	$ 3,466	$ 3,330
Unfunded commitments to extend credit, short term	71.00%	73.00%
Term of unfunded commitment	1 year