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AGREEMENTS - Narrative (Details) $ in Millions			3 Months Ended		222 Months Ended
	Jun. 21, 2019	Jun. 20, 2019	Mar. 31, 2023 USD ($) qtr	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($) qtr	Dec. 31, 2022 USD ($)
Investment Company, Financial Highlights [Line Items]
Asset coverage requirement applicable to senior securities	150.00%	200.00%	189.00%		189.00%
Number of quarters considered in base management fee calculation | qtr			2		2
Capital gains incentive fees payable			$ 29		$ 29	$ 35
Income based fees payable			157		157	81
Administrative fees			3	$ 4
Accounts payable and other liabilities			$ 117		117	167
Investment Advisory and Management Agreement | Controlled Affiliate
Investment Company, Financial Highlights [Line Items]
Termination notice period			60 days
Asset coverage requirement applicable to senior securities	150.00%	200.00%
Capital gains incentive fees payable			$ 29		29
Payments of capital gains incentive fees					133
Investment Advisory and Management Agreement | Controlled Affiliate | Minimum
Investment Company, Financial Highlights [Line Items]
Base management fee rate	1.00%	1.50%
Debt to equity leverage ratio	100.00%
Investment Advisory and Management Agreement | Controlled Affiliate | Maximum
Investment Company, Financial Highlights [Line Items]
Base management fee rate	1.50%
Debt to equity leverage ratio	100.00%
Incentive Rate, Quarterly Hurdle Rate | Controlled Affiliate
Investment Company, Financial Highlights [Line Items]
Incentive fee			1.75%
Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Threshold | Controlled Affiliate
Investment Company, Financial Highlights [Line Items]
Incentive fee			100.00%
Incentive Rate, Quarterly Catch-Up Threshold | Controlled Affiliate
Investment Company, Financial Highlights [Line Items]
Incentive fee			2.1875%
Incentive Rate, Pre-Incentive Fee Net Investment Income Exceeds Catch-Up Threshold | Controlled Affiliate
Investment Company, Financial Highlights [Line Items]
Incentive fee			20.00%
Incentive Rate, Realized Capital Gains | Controlled Affiliate
Investment Company, Financial Highlights [Line Items]
Incentive fee	20.00%		20.00%
Incentive Rate, Net Assets For Deferral Of Cash Payments | Controlled Affiliate
Investment Company, Financial Highlights [Line Items]
Incentive fee	7.00%
Capital Gains Incentive Fees | Controlled Affiliate
Investment Company, Financial Highlights [Line Items]
Due to related party			$ 0	$ 0	0
Administration Agreement | Controlled Affiliate
Investment Company, Financial Highlights [Line Items]
Termination notice period	60 days
Accounts payable and other liabilities			$ 3		$ 3	$ 2

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