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SEGMENT AND RELATED INFORMATION (Tables) | 9 Months Ended
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Sep. 30, 2025
Segment Reporting [Abstract] |
Schedule of Financial Data by Business Segment | Financial data for our business segments follows:
| Three Months Ended September 30, 2025
| Pipeline |  | Gathering |  | Total Reportable Segments |  | Eliminations |  | Total Consolidated
| (millions)
Revenues |  |  |  |  |  |  |  |  |
Operating revenues | $ | 169 |  |  | $ | 145 |  |  | $ | 314 |  |  | $ | — |  |  | $ | 314 |
Operating Expenses |  |  |  |  |  |  |  |  |
Operation and maintenance | 32 |  |  | 52 |  |  | 84 |  |  | — |  |  | 84 |
Depreciation and amortization | 27 |  |  | 38 |  |  | 65 |  |  | — |  |  | 65 |
Taxes other than income | 7 |  |  | 3 |  |  | 10 |  |  | — |  |  | 10 |
Other (Income) and Deductions |  |  |  |  |  |  |  |  |
Interest expense | 14 |  |  | 26 |  |  | 40 |  |  | — |  |  | 40 |
Interest income | — |  |  | (1) |  |  | (1) |  |  | — |  |  | (1) |
Earnings from equity method investees | (34) |  |  | — |  |  | (34) |  |  | — |  |  | (34) |
Other income | — |  |  | (3) |  |  | (3) |  |  | — |  |  | (3) |
Income tax expense | 28 |  |  | 7 |  |  | 35 |  |  | — |  |  | 35 |
Less: Net Income Attributable to Noncontrolling Interests | 3 |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Net Income Attributable to DT Midstream | $ | 92 |  |  | $ | 23 |  |  | $ | 115 |  |  | $ | — |  |  | $ | 115 |
Capital expenditures | $ | 63 |  |  | $ | 80 |  |  | $ | 143 |  |  | $ | — |  |  | $ | 143 |
| Three Months Ended September 30, 2024
| Pipeline |  | Gathering |  | Total Reportable Segments |  | Eliminations |  | Total Consolidated
| (millions)
Revenues |  |  |  |  |  |  |  |  |
Operating revenues | $ | 112 |  |  | $ | 136 |  |  | $ | 248 |  |  | $ | — |  |  | $ | 248 |
Operating Expenses |  |  |  |  |  |  |  |  |
Operation and maintenance | 17 |  |  | 46 |  |  | 63 |  |  | — |  |  | 63 |
Depreciation and amortization | 18 |  |  | 35 |  |  | 53 |  |  | — |  |  | 53 |
Taxes other than income | 5 |  |  | 5 |  |  | 10 |  |  | — |  |  | 10 |
Other (Income) and Deductions |  |  |  |  |  |  |  |  |
Interest expense | 12 |  |  | 26 |  |  | 38 |  |  | — |  |  | 38 |
Interest income | — |  |  | (1) |  |  | (1) |  |  | — |  |  | (1) |
Earnings from equity method investees | (40) |  |  | — |  |  | (40) |  |  | — |  |  | (40) |
Loss from financing activities | 2 |  |  | 2 |  |  | 4 |  |  | — |  |  | 4 |
Income tax expense | 24 |  |  | 6 |  |  | 30 |  |  | — |  |  | 30 |
Less: Net Income Attributable to Noncontrolling Interests | 3 |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Net Income Attributable to DT Midstream | $ | 71 |  |  | $ | 17 |  |  | $ | 88 |  |  | $ | — |  |  | $ | 88 |
Capital expenditures | $ | 14 |  |  | $ | 67 |  |  | $ | 81 |  |  | $ | — |  |  | $ | 81 |
| Nine Months Ended September 30, 2025
| Pipeline |  | Gathering |  | Total Reportable Segments |  | Eliminations |  | Total Consolidated
| (millions)
Revenues |  |  |  |  |  |  |  |  |
Operating revenues | $ | 514 |  |  | $ | 412 |  |  | $ | 926 |  |  | $ | — |  |  | $ | 926 |
Operating Expenses |  |  |  |  |  |  |  |  |
Operation and maintenance | 98 |  |  | 144 |  |  | 242 |  |  | — |  |  | 242 |
Depreciation and amortization | 83 |  |  | 108 |  |  | 191 |  |  | — |  |  | 191 |
Taxes other than income | 23 |  |  | 12 |  |  | 35 |  |  | — |  |  | 35 |
Other (Income) and Deductions |  |  |  |  |  |  |  |  |
Interest expense | 38 |  |  | 82 |  |  | 120 |  |  | — |  |  | 120 |
Interest income | (1) |  |  | (1) |  |  | (2) |  |  | — |  |  | (2) |
Earnings from equity method investees | (101) |  |  | — |  |  | (101) |  |  | — |  |  | (101) |
Other income | — |  |  | (3) |  |  | (3) |  |  | — |  |  | (3) |
Income tax expense | 87 |  |  | 17 |  |  | 104 |  |  | — |  |  | 104 |
Less: Net Income Attributable to Noncontrolling Interests | 10 |  | — |  |  | 10 |  |  | — |  |  | 10 |
Net Income Attributable to DT Midstream | $ | 277 |  |  | $ | 53 |  |  | $ | 330 |  |  | $ | — |  |  | $ | 330 |
Capital expenditures | $ | 107 |  |  | $ | 188 |  |  | $ | 295 |  |  | $ | — |  |  | $ | 295 |
| September 30, 2025
Investments in equity method investees | $ | 1,262 |  |  | $ | — |  |  | $ | 1,262 |  |  | $ | — |  |  | $ | 1,262 |
Total Assets | $ | 5,299 |  |  | $ | 4,762 |  |  | $ | 10,061 |  |  | $ | — |  |  | $ | 10,061 |
| Nine Months Ended September 30, 2024
| Pipeline |  | Gathering |  | Total Reportable Segments |  | Eliminations |  | Total Consolidated
| (millions)
Revenues |  |  |  |  |  |  |  |  |
Operating revenues | $ | 328 |  |  | $ | 404 |  |  | $ | 732 |  |  | $ | — |  |  | $ | 732 |
Operating Expenses |  |  |  |  |  |  |  |  |
Operation and maintenance | 48 |  |  | 121 |  |  | 169 |  |  | — |  |  | 169 |
Depreciation and amortization | 55 |  |  | 101 |  |  | 156 |  |  | — |  |  | 156 |
Taxes other than income | 16 |  |  | 15 |  |  | 31 |  |  | — |  |  | 31 |
Other (Income) and Deductions |  |  |  |  |  |  |  |  |
Interest expense | 37 |  |  | 80 |  |  | 117 |  |  | — |  |  | 117 |
Interest income | (1) |  |  | (1) |  |  | (2) |  |  | — |  |  | (2) |
Earnings from equity method investees | (125) |  |  | — |  |  | (125) |  |  | — |  |  | (125) |
Loss from financing activities | 2 |  |  | 2 |  |  | 4 |  |  | — |  |  | 4 |
Other income | (2) |  |  | (1) |  |  | (3) |  |  | — |  |  | (3) |
Income tax expense | 72 |  |  | 22 |  |  | 94 |  |  | — |  |  | 94 |
Less: Net Income Attributable to Noncontrolling Interests | 10 |  |  | — |  |  | 10 |  |  | — |  |  | 10 |
Net Income Attributable to DT Midstream | $ | 216 |  |  | $ | 65 |  |  | $ | 281 |  |  | $ | — |  |  | $ | 281 |
Capital expenditures | $ | 53 |  |  | $ | 207 |  |  | $ | 260 |  |  | $ | — |  |  | $ | 260 |
| December 31, 2024
Investments in equity method investees | $ | 1,297 |  |  | $ | — |  |  | $ | 1,297 |  |  | $ | — |  |  | $ | 1,297 |
Total Assets | $ | 5,274 |  |  | $ | 4,661 |  |  | $ | 9,935 |  |  | $ | — |  |  | $ | 9,935 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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