Noninterest Revenue and Noninterest Expense - Asset Management, Administration and Commissions (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Asset management fees
Investment management fees		$ 11,694	$ 10,865	$ 10,768
All other asset management fees		338	315	270
Total asset management fees		12,032	11,180	11,038
Total administration fees		2,249	2,197	2,179
Commissions and other fees
Brokerage commissions		2,959	2,439	2,505
All other commissions and fees		937	1,092	1,071
Total commissions and fees		3,896	3,531	3,576
Total asset management, administration and commissions	[1]	$ 18,177	$ 16,908	$ 16,793

[1] In the first quarter of 2020, the Firm reclassified certain fees from asset management, administration and commissions to lending- and deposit-related fees. Prior-period amounts have been revised to conform with the current presentation.