v3.26.3
SEGMENT AND RELATED INFORMATION (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
segment
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Segment Reporting [Line Items]          
Number of operating segments | segment     2    
Number of reportable segments | segment     2    
Revenues          
Operating revenues $ 336 $ 314 $ 1,015 $ 926  
Operating Expenses          
Operation and maintenance 89 84 264 242  
Depreciation and amortization 71 65 208 191  
Taxes other than income 11 10 38 35  
Asset losses and impairments, net 2 0 3 0  
Other (Income) and Deductions          
Interest expense 40 40 122 120  
Interest income (2) (1) (4) (2)  
Earnings from equity method investees (34) (34) (110) (101)  
Gain from financing activities (1) 0 (2) 0  
Other income (3) (3) (6) (3)  
Income tax expense 41 35 130 104  
Less: Net Income Attributable to Noncontrolling Interests 4 3 12 10  
Net Income Attributable to DT Midstream 118 115 360 330  
Capital expenditures 91 143 274 295  
Investments in equity method investees 1,220 1,253 1,220 1,253 $ 1,253
Consolidated assets 10,332 [1] 10,080 10,332 [1] 10,080 $ 10,080 [1]
Operating segments          
Revenues          
Operating revenues 343 314 1,035 926  
Operating Expenses          
Operation and maintenance 96 84 284 242  
Depreciation and amortization 71 65 208 191  
Taxes other than income 11 10 38 35  
Asset losses and impairments, net 2   3    
Other (Income) and Deductions          
Interest expense 40 40 122 120  
Interest income (2) (1) (4) (2)  
Earnings from equity method investees (34) (34) (110) (101)  
Gain from financing activities (1)   (2)    
Other income (3) (3) (6) (3)  
Income tax expense 41 35 130 104  
Less: Net Income Attributable to Noncontrolling Interests 4 3 12 10  
Net Income Attributable to DT Midstream 118 115 360 330  
Capital expenditures 91 143 274 295  
Investments in equity method investees 1,220 1,253 1,220 1,253  
Consolidated assets 10,332 10,080 10,332 10,080  
Operating segments | Pipeline          
Revenues          
Operating revenues 182 169 550 514  
Operating Expenses          
Operation and maintenance 36 32 110 98  
Depreciation and amortization 29 27 86 83  
Taxes other than income 8 7 25 23  
Asset losses and impairments, net 2   2    
Other (Income) and Deductions          
Interest expense 14 14 42 38  
Interest income (1) 0 (2) (1)  
Earnings from equity method investees (34) (34) (110) (101)  
Gain from financing activities 0   (1)    
Other income (2) 0 (5) 0  
Income tax expense 33 28 104 87  
Less: Net Income Attributable to Noncontrolling Interests 4 3 12 10  
Net Income Attributable to DT Midstream 93 92 287 277  
Capital expenditures 60 63 150 107  
Investments in equity method investees 1,220 1,253 1,220 1,253  
Consolidated assets 5,516 5,297 5,516 5,297  
Operating segments | Gathering          
Revenues          
Operating revenues 161 145 485 412  
Operating Expenses          
Operation and maintenance 60 52 174 144  
Depreciation and amortization 42 38 122 108  
Taxes other than income 3 3 13 12  
Asset losses and impairments, net 0   1    
Other (Income) and Deductions          
Interest expense 26 26 80 82  
Interest income (1) (1) (2) (1)  
Earnings from equity method investees 0 0 0 0  
Gain from financing activities (1)   (1)    
Other income (1) (3) (1) (3)  
Income tax expense 8 7 26 17  
Less: Net Income Attributable to Noncontrolling Interests 0 0 0 0  
Net Income Attributable to DT Midstream 25 23 73 53  
Capital expenditures 31 80 124 188  
Investments in equity method investees 0 0 0 0  
Consolidated assets 4,816 4,783 4,816 4,783  
Eliminations          
Revenues          
Operating revenues (7) 0 (20) 0  
Operating Expenses          
Operation and maintenance (7) 0 (20) 0  
Depreciation and amortization 0 0 0 0  
Taxes other than income 0 0 0 0  
Asset losses and impairments, net 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  
Gain from financing activities 0   0    
Other income 0 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 0  
Consolidated assets $ 0 $ 0 $ 0 $ 0  
[1]
(a) Our consolidated assets include $923 million and $943 million at September 30, 2026 and December 31, 2025, respectively, of certain assets that can be used only to settle obligations of the VIE. See Note 1, "Description of the Business and Basis of Presentation," to the Consolidated Financial Statements.