| Cover | Aug. 06, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 6, 2021 |
| Entity File Number | 1-40392 |
| Entity Registrant Name | DT Midstream, Inc. |
| Entity Central Index Key | 0001842022 |
| Entity Tax Identification Number | 38-2663964 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | One Energy Plaza |
| Entity Address, City or Town | Detroit |
| Entity Address, State or Province | MI |
| 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 |
| Title of 12(b) Security | Common stock, par value $0.01 |
| Trading Symbol | DTM |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
