Other Assets (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Other Assets [Abstract]
Securities borrowed	$ 47,989,000,000	$ 38,233,000,000
Derivative instruments, net	8,491,000,000	4,155,000,000
Receivable for securities settlement	4,665,000,000	102,000,000
Bank-owned life insurance	3,997,000,000	3,965,000,000
Investments in joint ventures and other unconsolidated entities	3,879,000,000	3,753,000,000
Collateral, net	2,694,000,000	1,603,000,000
Prepaid expenses	961,000,000	837,000,000
Right-of-use assets	833,000,000	865,000,000
Accounts receivable	789,000,000	621,000,000
Deferred tax assets, net of valuation allowance	608,000,000	627,000,000
Income taxes receivable	258,000,000	256,000,000
Other	3,467,000,000	3,451,000,000
Total	78,631,000,000	58,468,000,000
Equity securities without readily determinable fair values	586,000,000	585,000,000
Impairments	0
Advances	1,500,000,000	1,570,000,000
Capitalized costs to fulfill contracts with customers	$ 1,220,000,000	$ 1,190,000,000