Loans and Allowance for Credit Losses - Net Loans (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 33,916	$ 32,150
Allowance for credit losses	(115)	(97)
Loans, net of allowance	33,801	32,053
Floating Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	27,340
Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	21,873	21,248
Domestic | CLO
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	100	100
Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	12,043	10,902
Non-U.S. | CLO
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	4,984	4,741
Fund Finance | Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	12,184	12,154
Fund Finance | Domestic | Private Equity Capital Call Finance Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	8,990	7,570
Fund Finance | Domestic | Real Money Funds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	5,970	6,610
Fund Finance | Domestic | Business Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,210	1,110
Fund Finance | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	4,556	3,949
Leveraged loans | Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,278	2,431
Leveraged loans | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,114	1,118
Overdrafts | Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,418	1,707
Overdrafts | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,389	1,094
Other | Securities Finance Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,660	1,510
Other | Municipal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	321	321
Other | Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	7	42
Other | Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,992	1,871
Commercial real estate | Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,901	$ 2,985
Excluding Overdrafts | Fixed Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 2,770