N-2 - $ / shares |
9 Months Ended | |||||
|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Dec. 31, 2025 |
Sep. 30, 2025 |
Dec. 31, 2024 |
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| Cover [Abstract] | ||||||
| Entity Central Index Key | 0001948368 | |||||
| Amendment Flag | false | |||||
| Securities Act File Number | 814-01579 | |||||
| Document Type | 10-Q | |||||
| Entity Registrant Name | Phillip Street BDC LLC | |||||
| Entity Address, Address Line One | 200 West Street | |||||
| Entity Address, City or Town | New York | |||||
| Entity Address, State or Province | NY | |||||
| Entity Address, Postal Zip Code | 10282 | |||||
| City Area Code | 312 | |||||
| Local Phone Number | 655-4419 | |||||
| Entity Emerging Growth Company | true | |||||
| Entity Ex Transition Period | true | |||||
| General Description of Registrant [Abstract] | ||||||
| Investment Objectives and Practices [Text Block] | The Company’s investment objective is to generate current income and, to a lesser extent, capital appreciation primarily through direct originations of secured debt, including first lien, unitranche debt, including last out portions of such loans, and second lien debt, and unsecured debt, including mezzanine debt, as well as through select equity investments. |
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| Risk Factors [Table Text Block] | ITEM 1A. RISK FACTORS An investment in our securities involves a high degree of risk. There have been no material changes to the risk factors previously reported under Item 1A. “Risk Factors” of our 2025 Annual Report. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial may materially affect our business, financial condition and/or operating results. |
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| NAV Per Share | [1] | $ 20.12 | $ 19.83 | $ 20.32 | $ 19.84 | |
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | ||||||
| Long Term Debt, Title [Text Block] | Credit Facility
On February 10, 2023, we entered into the Revolving Credit Facility, which, as of September 30, 2026, allowed the SPV to borrow up to $750 million at any one time outstanding, subject to leverage and borrowing base restrictions. For further details, see Note 6 “Debt―Credit Facility” to our consolidated financial statements included in this report. |
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