Loans and Allowance for Credit Losses - Net Loans (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 52,062	$ 46,782
Allowance for credit losses	(161)	(193)
Loans, net of allowance	51,901	46,589
Non-U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	21,820	18,780
Subscription finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	15,718	13,138
Fund finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	11,381	10,916
Real Money Funds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,930	8,300
Business Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,530	1,750
Collateralized loan obligations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	13,590	12,809
Broadly syndicated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	10,690	10,300
Middle market
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,900	2,510
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,599	2,851
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,291	2,471
Overdrafts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,244	1,962
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,239	2,635
Securities Finance Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,150	2,520
Municipal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	90	120
Floating Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 44,490
Fixed Rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans		$ 2,330