Loans and Allowance for Credit Losses - Net Loans (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 38,635	$ 36,631
Allowance for credit losses	(135)	(135)
Loans, net of allowance	38,500	36,496
Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	23,527	23,065
Domestic | Collateralized loan obligations in loan form
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	150	150
Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	15,108	13,566
Non-U.S. | Collateralized loan obligations in loan form
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	6,561	6,369
Fund Finance | Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	13,775	13,697
Fund Finance | Domestic | Private Equity Capital Call Finance Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	10,150	9,690
Fund Finance | Domestic | Real Money Funds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	6,490	6,630
Fund Finance | Domestic | Business Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,010	1,050
Fund Finance | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	5,207	4,956
Leveraged loans | Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,503	2,412
Leveraged loans | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,204	1,194
Overdrafts | Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,584	1,225
Overdrafts | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,136	1,047
Other | Securities Finance Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,170	2,230
Other | Municipal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	276	276
Other | Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	4	5
Other | Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,453	2,512
Commercial real estate | Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	3,062	$ 3,069
Excluding Overdrafts | Floating Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	31,980
Excluding Overdrafts | Fixed Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 2,930