Collateralized Transactions - Offsetting of Certain Collateralized Transactions (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Securities purchased under agreements to resell
Gross Amounts	$ 356,962	$ 300,242
Amounts Offset	(219,610)	(189,502)
Balance Sheet Net Amounts	137,352	110,740
Amounts not offset	(135,517)	(108,893)
Net Amounts	1,835	1,847
Securities borrowed
Gross Amounts	169,645	142,453
Amounts Offset	(37,233)	(21,362)
Balance Sheet Net Amounts	132,412	121,091
Amounts not offset	(125,108)	(115,969)
Net Amounts	7,304	5,122
Securities sold under agreements to repurchase
Gross Amounts	277,939	252,153
Amounts Offset	(219,610)	(189,502)
Balance Sheet Net Amounts	58,329	62,651
Amounts not offset	(53,937)	(58,357)
Net Amounts	4,392	4,294
Securities loaned
Gross Amounts	54,688	36,419
Amounts Offset	(37,233)	(21,362)
Balance Sheet Net Amounts	17,455	15,057
Amounts not offset	(17,436)	(15,046)
Net Amounts	19	11
Net amounts for which master netting agreements are not in place or may not be legally enforceable
Securities purchased under agreements to resell	1,751	1,741
Securities borrowed	2,877	607
Securities sold under agreements to repurchase	2,865	3,014
Securities loaned	$ 1	$ 2