| Document and Entity Information | Aug. 05, 2021 |
| Cover [Abstract] | |
| Entity Incorporation State Country Code | DE |
| Entity Address, State or Province | TX |
| Amendment Flag | false |
| Entity Central Index Key | 0001789832 |
| Document Type | 8-K |
| Document Period End Date | Aug. 5, 2021 |
| Entity Registrant Name | Hess Midstream LP |
| Entity File Number | 001-39163 |
| Entity Tax Identification Number | 84-3211812 |
| Entity Address, Address Line One | 1501 McKinney Street |
| Entity Address, City or Town | Houston |
| Entity Address, Postal Zip Code | 77010 |
| City Area Code | (713) |
| Local Phone Number | 496-4200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A shares representing limited partner interests |
| Trading Symbol | HESM |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
