INVESTMENTS - Summary of Funded Capital and Unfunded Capital Commitments (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Total unfunded capital commitments	$ 30	$ 57
Senior Direct Lending Program
Schedule of Investments [Line Items]
Total capital funded	5,094	5,127
Total unfunded capital commitments	229	294
Senior Direct Lending Program | Ares Capital Corporation
Schedule of Investments [Line Items]
Total capital funded	1,266	1,274
Total unfunded capital commitments	$ 53	$ 68