FAIR VALUE MEASUREMENTS OF FINANCIAL INSTRUMENTS - Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Borrowings of consolidated funds	$ 451	$ 462
Cash and Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	711	1,181
Financial Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	433	417
Common and Preferred Shares
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	92	337
Investment, Affiliated Issuer
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	643	700
Freestanding Derivative
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable Interest Entities	5
Equity Method Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	260	330
Investments in equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable Interest Entities	2,212		$ 253
Investments in debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable Interest Entities	170	252
Assets, Total
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	2,139	2,965
Variable Interest Entities	2,387		505
Financial Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	467	449
Borrowings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Borrowings of consolidated funds	451		462
Liabilities, Total
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	467	449
Borrowings of consolidated funds	451		462
Common and Preferred Shares
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	28	27
Investment, Affiliated Issuer
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	643	700
Assets, Total
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	671	727
Liabilities, Total
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	0	0
Financial Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	433	410
Common and Preferred Shares
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	64	310
Equity Method Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	260	330
Investments in equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable Interest Entities	2,212	253	253
Investments in debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable Interest Entities	170	252
Assets, Total
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	757	1,050
Variable Interest Entities	2,382		505
Financial Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	453	444
Liabilities, Total
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	453	444
Financial Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments		7
Freestanding Derivative
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Variable Interest Entities	5
Assets, Total
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	0	7
Variable Interest Entities	5
Financial Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	14	5
Liabilities, Total
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	14	5
Cash and Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	711	1,181
Common and Preferred Shares
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments		0
Assets, Total
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	711	1,181
Borrowings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Borrowings of consolidated funds	451		462
Liabilities, Total
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments	0	$ 0
Borrowings of consolidated funds	$ 451		$ 462