Loans and Allowance for Credit Losses - Net Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 32,532,000	$ 27,925,000
Allowance for credit losses	(87,000)	(122,000)
Loans, net of allowance	32,445,000	27,803,000
Geographic Distribution, Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	22,114,000	21,132,000
Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	10,418,000	6,793,000
Fund Finance | Securities Finance Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,784,000	1,911,000
Fund Finance | Municipal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	455,000	754,000
Fund Finance | Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	23,000	54,000
Fund Finance | Geographic Distribution, Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	12,396,000	11,531,000
Fund Finance | Geographic Distribution, Domestic | 40 Act Funds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	6,397,000	6,391,000
Fund Finance | Geographic Distribution, Domestic | Private Equity Capital Call Finance Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	9,147,000	8,380,000
Fund Finance | Geographic Distribution, Domestic | Collateralized Loan Obligations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,913,000
Fund Finance | Geographic Distribution, Domestic | Business Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,387,000	821,000
Fund Finance | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	7,778,000	4,432,000
Leveraged loans | Geographic Distribution, Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	3,106,000	2,923,000
Leveraged loans | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,328,000	1,242,000
Overdrafts | Geographic Distribution, Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,796,000	1,894,000
Overdrafts | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	1,312,000	1,088,000
Other | Geographic Distribution, Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	2,262,000	2,688,000
Other | Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	0	31,000
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross		2,096,000
Commercial real estate | Geographic Distribution, Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, gross	$ 2,554,000	$ 2,096,000