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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