Document and Entity Information - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Mar. 03, 2026 |
Jun. 30, 2025 |
|
| Cover [Abstract] | |||
| Entity Central Index Key | 0001772704 | ||
| Document Period End Date | Dec. 31, 2025 | ||
| Document Fiscal Year Focus | 2025 | ||
| Document Fiscal Period Focus | FY | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Small Business | false | ||
| Entity Shell Company | false | ||
| Entity Voluntary Filers | No | ||
| ICFR Auditor Attestation Flag | false | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Entity Filer Category | Non-accelerated Filer | ||
| Entity Interactive Data Current | Yes | ||
| Entity Current Reporting Status | Yes | ||
| Entity Public Float | $ 0 | ||
| Entity Common Stock, Shares Outstanding | 13,854,750 | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Tax Identification Number | 83-3053002 | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Amendment Flag | false | ||
| Securities Act File Number | 814-01307 | ||
| Document Type | 10-K | ||
| Entity Registrant Name | Goldman Sachs Private Middle Market Credit II 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 | ||
| Title of 12(g) Security | Limited Liability Company Common Units | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Emerging Growth Company | true | ||
| Entity Ex Transition Period | true | ||
| Auditor Firm ID | 238 | ||
| Auditor Name | PricewaterhouseCoopers LLP | ||
| Auditor Location | Boston, Massachusetts | ||
| Auditor Opinion [Text Block] | Opinion on the Financial Statements
We have audited the accompanying consolidated statements of financial condition, including the consolidated schedules of investments, of Goldman Sachs Private Middle Market Credit II LLC and its subsidiaries (the “Company”) as of December 31, 2025 and 2024, and the related consolidated statements of operations, changes in members’ capital and cash flows for each of the three years in the period ended December 31, 2025, including the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations, changes in its members’ capital and its cash flows for each of the three years in the period ended December 31, 2025 in conformity with accounting principles generally accepted in the United States of America. |