Other Assets (Details) - USD ($)	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Other Assets [Abstract]
Securities borrowed	$ 35,147,000,000	$ 23,131,000,000
Derivative instruments, net	4,355,000,000	5,307,000,000
Bank-owned life insurance	3,826,000,000	3,742,000,000
Collateral, net	3,436,000,000	2,983,000,000
Investments in joint ventures and other unconsolidated entities	3,163,000,000	2,981,000,000
Right-of-use assets	865,000,000	805,000,000
Prepaid expenses	839,000,000	598,000,000
Deferred tax assets, net of valuation allowance	768,000,000	1,034,000,000
Receivable for securities settlement	628,000,000	1,082,000,000
Accounts receivable	574,000,000	611,000,000
Income taxes receivable	244,000,000	246,000,000
Deposits with clearing organizations	63,000,000	58,000,000
Other	2,340,000,000	2,228,000,000
Total	56,248,000,000	44,806,000,000
Equity securities without readily determinable fair value, amount	200,000,000	183,000,000
Equity securities without readily determinable fair value, impairment loss	0
Advances	$ 1,110,000,000	$ 1,150,000,000