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EARNINGS PER SHARE AND DIVIDENDS - Reconciliation of Basic and Diluted Earnings Per Share Calculation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Basic and Diluted Earnings per Common Share        
Net Income Attributable to DT Midstream $ 115 $ 88 $ 330 $ 281
Average number of common shares outstanding — basic (in shares) 101.6 97.1 101.6 97.1
Incremental shares attributable to:        
Average dilutive restricted stock units and performance share awards (in shares) 0.9 0.9 0.9 0.7
Average number of common shares outstanding — diluted (in shares) 102.5 98.0 102.5 97.8
Basic earnings per Common Share (in dollars per share) $ 1.14 $ 0.91 $ 3.25 $ 2.90
Diluted earnings per Common Share (in dollars per share) $ 1.13 $ 0.90 $ 3.22 $ 2.87