Collateralized Transactions - Offsetting of Certain Collateralized Transactions (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Securities purchased under agreements to resell
Gross Amounts	$ 293,414	$ 300,242
Amounts Offset	(170,681)	(189,502)
Balance Sheet Net Amounts	122,733	110,740
Amounts not offset	(118,405)	(108,893)
Net Amounts	4,328	1,847
Securities borrowed
Gross Amounts	163,755	142,453
Amounts Offset	(30,903)	(21,362)
Balance Sheet Net Amounts	132,852	121,091
Amounts not offset	(128,658)	(115,969)
Net Amounts	4,194	5,122
Securities sold under agreements to repurchase
Gross Amounts	253,085	252,153
Amounts Offset	(170,681)	(189,502)
Balance Sheet Net Amounts	82,404	62,651
Amounts not offset	(74,081)	(58,357)
Net Amounts	8,323	4,294
Securities loaned
Gross Amounts	46,848	36,419
Amounts Offset	(30,903)	(21,362)
Balance Sheet Net Amounts	15,945	15,057
Amounts not offset	(15,935)	(15,046)
Net Amounts	10	11
Net amounts for which master netting agreements are not in place or may not be legally enforceable
Securities purchased under agreements to resell	4,175	1,741
Securities borrowed	447	607
Securities sold under agreements to repurchase	6,312	3,014
Securities loaned	$ 2	$ 2