Loans and Allowance for Credit Losses - Net Loans (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 43,200	$ 36,631
Allowance for credit losses	(174)	(135)
Loans, net of allowance	43,026	36,496
Commercial and financial | Securities Finance Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	3,010	2,230
Commercial and financial | Municipal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	214	276
Commercial and financial | Total Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross		5
Commercial and financial | Floating rate loans excluding overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	38,460
Commercial and financial | Fixed Rate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,760
Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	26,409	23,065
Domestic | Commercial and financial | Fund finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	16,347	13,697
Domestic | Commercial and financial | Private equity capital call finance loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	11,540	9,690
Domestic | Commercial and financial | 40 Act Funds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	8,090	6,630
Domestic | Commercial and financial | Business development loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,440	1,050
Domestic | Commercial and financial | Leveraged loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,742	2,412
Domestic | Commercial and financial | Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,208	1,225
Domestic | Commercial and financial | Collateralized loan obligations in loan form
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	50	150
Domestic | Commercial and financial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	3,220	2,512
Domestic | Commercial real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,842	3,069
Foreign
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	16,791	13,566
Foreign | Commercial and financial | Fund finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	6,601	4,956
Foreign | Commercial and financial | Leveraged loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,082	1,194
Foreign | Commercial and financial | Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	772	1,047
Foreign | Commercial and financial | Collateralized loan obligations in loan form
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 8,336	$ 6,369