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Investments - Narrative (Details) $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Feb. 18, 2026 portfolio_company industry | Feb. 12, 2026 USD ($) | Sep. 04, 2025 USD ($) | May 15, 2025 USD ($) | Jan. 13, 2025 USD ($) | Nov. 01, 2024 USD ($) | Mar. 31, 2026 USD ($) | Jun. 30, 2026 USD ($) | Dec. 31, 2025 USD ($)
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortized cost |  |  |  |  |  |  |  | $ 15,113,516 | [1],[2],[3],[4] | $ 16,417,779 | [5],[6],[7],[8]
Aggregate fair value of asset sale |  | $ 357,600 |  |  |  |  |  |  |  |  |
Fair value equivalent percentage | 99.80% |  |  |  |  |  |  |  |  |  |
Number of portfolio companies | portfolio_company | 74 |  |  |  |  |  |  |  |  |  |
Number of industries | industry | 24 |  |  |  |  |  |  |  |  |  |
Investments floating rate percentage | 98.30% |  |  |  |  |  |  |  |  |  |
Average investment |  |  |  |  |  |  |  |  |  | $ 4,800 |
Weighted average spread percentage |  |  |  |  |  |  |  |  |  | 5.50% |
Underlying portfolio percentage |  |  |  |  |  |  |  |  |  | 5.00% |
Gain on sale of assets |  |  |  |  |  |  | $ 1,700 |  |  |  |
First-Lien Investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value equivalent percentage | 91.90% |  |  |  |  |  |  |  |  |  |
Second-Lien Investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value equivalent percentage | 4.70% |  |  |  |  |  |  |  |  |  |
Unsecured Investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value equivalent percentage | 3.40% |  |  |  |  |  |  |  |  |  |
Blue Owl Credit SLF LLC |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment, ownership percentage |  |  |  |  |  |  |  | 100.00% |  |  |
Blue Owl Credit SLF LLC | Blue Owl Capital Corporation |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment, ownership percentage |  |  |  |  |  |  |  | 64.40% |  |  |
Credit SLF |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment company, committed capital |  |  |  |  | $ 6,300 |  |  |  |  |  |
Amortized cost |  |  |  |  | 2,400 |  |  |  |  |  |
Credit SLF | Blue Owl Credit SLF LLC |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment company, committed capital |  |  |  |  | $ 6,300 | $ 774,200 |  | $ 24,500 |  |  |
Investment, ownership percentage |  |  |  |  | 0.70% | 84.60% |  | 42.80% |  |  |
Blue Owl Credit SLF LLC |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment company, committed capital |  |  |  |  |  |  |  | $ 746,395 |  |  |
Blue Owl Credit SLF LLC | Blue Owl Capital Corporation |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment company, committed capital |  |  | $ 427,100 | $ 404,100 |  |  |  | 446,460 |  |  |
Unfunded committed capital |  |  |  |  |  |  |  | $ 14,500 |  |  |
[1] | Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 30 for additional information on the Company’s restricted securities.
[2] | The amortized cost represents the original cost adjusted for the amortization or accretion of premium or discount, as applicable, on debt investments using the effective interest method.
[3] | Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Revolving Credit Facility, SPV Asset Facilities and CLOs. See “Note 5 — Debt.”
[4] | As of June 30, 2026, the net estimated unrealized loss for U.S. federal income tax purposes was $274.6 million based on a tax cost basis of $15.23 billion. As of June 30, 2026, the estimated aggregate gross unrealized loss for U.S. federal income tax purposes was $748.9 million and the estimated aggregate gross unrealized gain for U.S. federal income tax purposes was $474.3 million
[5] | Certain portfolio company investments are subject to contractual restrictions on sales. Refer to footnote 30 for additional information on the Company’s restricted securities.
[6] | The amortized cost represents the original cost adjusted for the amortization or accretion of premium or discount, as applicable, on debt investments using the effective interest method.
[7] | As of December 31, 2025, the net estimated unrealized loss for U.S. federal income tax purposes was $26.6 million based on a tax cost basis of $16.60 billion. As of December 31, 2025, the estimated aggregate gross unrealized loss for U.S. federal income tax purposes was $572.2 million and the estimated aggregate gross unrealized gain for U.S. federal income tax purposes was $545.6 million.
[8] | Unless otherwise indicated, the Company’s portfolio companies are pledged as collateral supporting the amounts outstanding under the Revolving Credit Facility, SPV Asset Facilities and CLOs. See “Note 5 — Debt.”

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