Collateralized Transactions - Offsetting of Certain Collateralized Transactions (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Securities purchased under agreements to resell
Gross Amounts	$ 330,717	$ 300,242
Amounts Offset	(211,807)	(189,502)
Balance Sheet Net Amounts	118,910	110,740
Amounts not offset	(115,646)	(108,893)
Net Amounts	3,264	1,847
Securities borrowed
Gross Amounts	157,216	142,453
Amounts Offset	(34,507)	(21,362)
Balance Sheet Net Amounts	122,709	121,091
Amounts not offset	(118,221)	(115,969)
Net Amounts	4,488	5,122
Securities sold under agreements to repurchase
Gross Amounts	277,484	252,153
Amounts Offset	(211,807)	(189,502)
Balance Sheet Net Amounts	65,677	62,651
Amounts not offset	(61,102)	(58,357)
Net Amounts	4,575	4,294
Securities loaned
Gross Amounts	51,585	36,419
Amounts Offset	(34,507)	(21,362)
Balance Sheet Net Amounts	17,078	15,057
Amounts not offset	(17,059)	(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	2,753	1,741
Securities borrowed	486	607
Securities sold under agreements to repurchase	3,047	3,014
Securities loaned	$ 2	$ 2