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AGREEMENTS - Narrative (Details) $ in Millions			3 Months Ended		9 Months Ended		216 Months Ended
	Jun. 21, 2019	Jun. 20, 2019	Sep. 30, 2022 USD ($) qtr	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) qtr	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) qtr	Dec. 31, 2021 USD ($)
Investment Company, Financial Highlights [Line Items]
Number of quarters considered in base management fee calculation | qtr			2		2		2
Capital gains incentive fees payable			$ 72		$ 72		$ 72	$ 161
Administrative fees			3	$ 4	9	$ 11
Accounts payable and other liabilities			139		$ 139		139	111
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			72		$ 72		72
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%
Administration Agreement | Controlled Affiliate
Investment Company, Financial Highlights [Line Items]
Termination notice period	60 days
Accounts payable and other liabilities			3		$ 3		3	$ 4
Capital Gains Incentive Fees | Controlled Affiliate
Investment Company, Financial Highlights [Line Items]
Due to related party			$ 0	$ 0	$ 0	$ 0	$ 0

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