| Document and Entity Information | Jun. 25, 2021 |
| Cover [Abstract] | |
| Entity Address, State or Province | MI |
| Amendment Flag | false |
| Entity Central Index Key | 0001842022 |
| Current Fiscal Year End Date | --12-31 |
| Document Type | 8-K |
| Document Period End Date | Jun. 25, 2021 |
| Entity File Number | 1-40392 |
| Entity Registrant Name | DT Midstream, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity Tax Identification Number | 38-2663964 |
| Entity Address, Address Line One | One Energy Plaza |
| Entity Address, City or Town | Detroit |
| Entity Address, Postal Zip Code | 48226-1279 |
| City Area Code | 313 |
| Local Phone Number | 402-8532 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock, par value $0.01 |
| Trading Symbol | DTM |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
