Other Assets (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Other Assets [Abstract]
Securities borrowed	$ 25,288,000,000	$ 23,131,000,000
Derivative instruments, net	4,937,000,000	5,307,000,000
Bank-owned life insurance	3,770,000,000	3,742,000,000
Investments in joint ventures and other unconsolidated entities	2,989,000,000	2,981,000,000
Collateral, net	2,518,000,000	2,983,000,000
Deferred tax assets, net of valuation allowance	987,000,000	1,034,000,000
Right-of-use assets	831,000,000	805,000,000
Prepaid expenses	825,000,000	598,000,000
Accounts receivable	752,000,000	611,000,000
Receivable for securities settlement	297,000,000	1,082,000,000
Income taxes receivable	238,000,000	246,000,000
Deposits with clearing organizations	59,000,000	58,000,000
Other	1,977,000,000	2,228,000,000
Other Assets, Total	45,468,000,000	44,806,000,000
Equity securities without readily determinable fair value, amount	192,000,000	183,000,000
Equity securities without readily determinable fair value, impairment loss	0
Advances	$ 886,000,000	$ 1,150,000,000