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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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