Collateralized Transactions - Offsetting of Certain Collateralized Transactions (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Securities purchased under agreements to resell
Gross Amounts	$ 197,486	$ 264,140
Amounts Offset	(77,487)	(147,906)
Balance Sheet Net Amounts	119,999	116,234
Amounts Not Offset	(106,896)	(114,108)
Net Amounts	13,103	2,126
Securities borrowed
Gross Amounts	139,395	124,921
Amounts Offset	(9,682)	(12,530)
Balance Sheet Net Amounts	129,713	112,391
Amounts Not Offset	(124,028)	(107,434)
Net Amounts	5,685	4,957
Securities sold under agreements to repurchase
Gross Amounts	139,675	198,493
Amounts Offset	(77,487)	(147,906)
Balance Sheet Net Amounts	62,188	50,587
Amounts Not Offset	(53,692)	(43,960)
Net Amounts	8,496	6,627
Securities loaned
Gross Amounts	21,981	20,261
Amounts Offset	(9,682)	(12,530)
Balance Sheet Net Amounts	12,299	7,731
Amounts Not Offset	(12,019)	(7,430)
Net Amounts	280	301
Net amounts for which master netting agreements are not in place or may not be legally enforceable
Securities purchased under agreements to resell	12,514	1,870
Securities borrowed	1,041	596
Securities sold under agreements to repurchase	8,295	6,282
Securities loaned	$ 139	$ 128