INVESTMENTS - Funded Capital and Unfunded Capital Commitments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Total net adjusted unfunded loan commitments	$ 25	$ 32
Senior Direct Lending Program
Schedule of Investments [Line Items]
Total capital funded	4,900	5,361
Total net adjusted unfunded loan commitments	291	260
Senior Direct Lending Program | Ares Capital Corporation
Schedule of Investments [Line Items]
Total capital funded	1,274	1,328
Total net adjusted unfunded loan commitments	$ 68	$ 60