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INVESTMENTS - Summary of Funded Capital and Unfunded Capital Commitments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Total net adjusted unfunded loan commitments	$ 24	$ 32
Senior Direct Lending Program
Schedule of Investments [Line Items]
Total capital funded	5,215	5,361
Total net adjusted unfunded loan commitments	246	260
Senior Direct Lending Program | Ares Capital Corporation
Schedule of Investments [Line Items]
Total capital funded	1,294	1,328
Total net adjusted unfunded loan commitments	$ 57	$ 60

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