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Segment and Related Information - Financial Data for Business Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Operating revenues | $ 922 | $ 920 | $ 840
Operation and maintenance | 245 | 267 | 231
Depreciation and amortization | 182 | 170 | 166
Taxes other than income | 28 | 28 | 24
Asset (gains) losses and impairments, net | (4) | (23) | 17
Operating Income | 471 | 478 | 402
Interest expense | 150 | 137 | 112
Interest income | (1) | (3) | (4)
Earnings from equity method investees | (177) | (150) | (126)
Loss from financing activities | 0 | 13 | 0
Other (income) and expense | (1) | (1) | (2)
Income Tax Expense | 104 | 100 | 104
Net Income | 396 | 382 | 318
Less: Net Income Attributable to Noncontrolling Interests | 12 | 12 | 11
Net Income Attributable to DT Midstream | 384 | 370 | 307
Capital expenditures | 772 | 890 | 140
Investments in equity method investees | 1,762 | 2,200 | 1,691
Goodwill | 473 | 473 | 473
Total Assets | 8,982 | 8,833 | 8,166
Operating segments | Pipeline |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 377 | 339 | 307
Operation and maintenance | 55 | 54 | 59
Depreciation and amortization | 69 | 63 | 63
Taxes other than income | 15 | 14 | 13
Asset (gains) losses and impairments, net | (4) | (6) | 0
Operating Income | 242 | 214 | 172
Interest expense | 55 | 57 | 51
Interest income | (1) | (1) | (1)
Earnings from equity method investees | (177) | (150) | (126)
Loss from financing activities |  | 6 |
Other (income) and expense | 0 | 0 | (3)
Income Tax Expense | 75 | 62 | 62
Net Income | 290 | 240 | 189
Less: Net Income Attributable to Noncontrolling Interests | 12 | 12 | 11
Net Income Attributable to DT Midstream | 278 | 228 | 178
Capital expenditures | 255 | 638 | 20
Investments in equity method investees | 1,762 | 2,200 | 1,691
Goodwill | 53 | 53 | 53
Total Assets | 4,439 | 4,625 | 4,165
Operating segments | Gathering |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 545 | 581 | 534
Operation and maintenance | 190 | 213 | 173
Depreciation and amortization | 113 | 107 | 103
Taxes other than income | 13 | 14 | 11
Asset (gains) losses and impairments, net | 0 | (17) | 17
Operating Income | 229 | 264 | 230
Interest expense | 95 | 80 | 61
Interest income | 0 | (2) | (3)
Earnings from equity method investees | 0 | 0 | 0
Loss from financing activities |  | 7 |
Other (income) and expense | (1) | (1) | 1
Income Tax Expense | 29 | 38 | 42
Net Income | 106 | 142 | 129
Less: Net Income Attributable to Noncontrolling Interests | 0 | 0 | 0
Net Income Attributable to DT Midstream | 106 | 142 | 129
Capital expenditures | 517 | 252 | 120
Investments in equity method investees | 0 | 0 | 0
Goodwill | 420 | 420 | 420
Total Assets | 4,543 | 4,208 | 4,001
Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 | (1)
Operation and maintenance | 0 | 0 | (1)
Depreciation and amortization | 0 | 0 | 0
Taxes other than income | 0 | 0 | 0
Asset (gains) losses and impairments, net | 0 | 0 | 0
Operating Income | 0 | 0 | 0
Interest expense | 0 | 0 | 0
Interest income | 0 | 0 | 0
Earnings from equity method investees | 0 | 0 | 0
Loss from financing activities |  | 0 |
Other (income) and expense | 0 | 0 | 0
Income Tax Expense | 0 | 0 | 0
Net Income | 0 | 0 | 0
Less: Net Income Attributable to Noncontrolling Interests | 0 | 0 | 0
Net Income Attributable to DT Midstream | 0 | 0 | 0
Capital expenditures | 0 | 0 | 0
Investments in equity method investees | 0 | 0 | 0
Goodwill | 0 | 0 | 0
Total Assets | $ 0 | $ 0 | $ 0

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