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SEGMENT AND RELATED INFORMATION (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
segment
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Segment Reporting Information [Line Items]          
Number of segments | segment     2    
Revenues          
Operating revenues $ 314 $ 248 $ 926 $ 732  
Operating Expenses          
Operation and maintenance 84 63 242 169  
Depreciation and amortization 65 53 191 156  
Taxes other than income 10 10 35 31  
Other (Income) and Deductions          
Interest expense 40 38 120 117  
Interest income (1) (1) (2) (2)  
Earnings from equity method investees (34) (40) (101) (125)  
Loss from financing activities   4 0 4  
Other income (3) 0 (3) (3)  
Income Tax Expense 35 30 104 94  
Less: Net Income Attributable to Noncontrolling Interests 3 3 10 10  
Net Income Attributable to DT Midstream 115 88 330 281  
Capital expenditures 143 81 295 260  
Investments in equity method investees 1,262   1,262   $ 1,297
Total Assets 10,061   10,061   9,935
Pipeline          
Revenues          
Operating revenues 169 112 514 328  
Gathering          
Revenues          
Operating revenues 145 136 412 404  
Operating segments          
Revenues          
Operating revenues 314 248 926 732  
Operating Expenses          
Operation and maintenance 84 63 242 169  
Depreciation and amortization 65 53 191 156  
Taxes other than income 10 10 35 31  
Other (Income) and Deductions          
Interest expense 40 38 120 117  
Interest income (1) (1) (2) (2)  
Earnings from equity method investees (34) (40) (101) (125)  
Loss from financing activities   4   4  
Other income (3)   (3) (3)  
Income Tax Expense 35 30 104 94  
Less: Net Income Attributable to Noncontrolling Interests 3 3 10 10  
Net Income Attributable to DT Midstream 115 88 330 281  
Capital expenditures 143 81 295 260  
Investments in equity method investees 1,262   1,262   1,297
Total Assets 10,061   10,061   9,935
Operating segments | Pipeline          
Revenues          
Operating revenues 169 112 514 328  
Operating Expenses          
Operation and maintenance 32 17 98 48  
Depreciation and amortization 27 18 83 55  
Taxes other than income 7 5 23 16  
Other (Income) and Deductions          
Interest expense 14 12 38 37  
Interest income 0 0 (1) (1)  
Earnings from equity method investees (34) (40) (101) (125)  
Loss from financing activities   2   2  
Other income 0   0 (2)  
Income Tax Expense 28 24 87 72  
Less: Net Income Attributable to Noncontrolling Interests 3 3 10 10  
Net Income Attributable to DT Midstream 92 71 277 216  
Capital expenditures 63 14 107 53  
Investments in equity method investees 1,262   1,262   1,297
Total Assets 5,299   5,299   5,274
Operating segments | Gathering          
Revenues          
Operating revenues 145 136 412 404  
Operating Expenses          
Operation and maintenance 52 46 144 121  
Depreciation and amortization 38 35 108 101  
Taxes other than income 3 5 12 15  
Other (Income) and Deductions          
Interest expense 26 26 82 80  
Interest income (1) (1) (1) (1)  
Earnings from equity method investees 0 0 0 0  
Loss from financing activities   2   2  
Other income (3)   (3) (1)  
Income Tax Expense 7 6 17 22  
Less: Net Income Attributable to Noncontrolling Interests 0 0 0 0  
Net Income Attributable to DT Midstream 23 17 53 65  
Capital expenditures 80 67 188 207  
Investments in equity method investees 0   0   0
Total Assets 4,762   4,762   4,661
Eliminations          
Revenues          
Operating revenues 0 0 0 0  
Operating Expenses          
Operation and maintenance 0 0 0 0  
Depreciation and amortization 0 0 0 0  
Taxes other than income 0 0 0 0  
Other (Income) and Deductions          
Interest expense 0 0 0 0  
Interest income 0 0 0 0  
Earnings from equity method investees 0 0 0 0  
Loss from financing activities   0   0  
Other income 0   0 0  
Income Tax Expense 0 0 0 0  
Less: Net Income Attributable to Noncontrolling Interests 0 0 0 0  
Net Income Attributable to DT Midstream 0 0 0 0  
Capital expenditures 0 $ 0 0 $ 0  
Investments in equity method investees 0   0   0
Total Assets $ 0   $ 0   $ 0