Document and Entity Information
| Document and Entity Information | Dec. 17, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 17, 2024 |
| Entity Registrant Name | Goldman Sachs Private Middle Market Credit LLC |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 814-01215 |
| Entity Tax Identification Number | 81-3233378 |
| Entity Address Address Line 1 | 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 Information Former Legal Or Registered Name | Goldman Sachs Private Middle Market Credit LLC |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
| Current Fiscal Year End Date | --12-31 |
| Amendment Flag | false |
| Entity Central Index Key | 0001674760 |