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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Basic and Diluted Earnings per Common Share        
Net Income Attributable to DT Midstream $ 96 $ 91 $ 193 $ 172
Average number of common shares outstanding — basic (in shares) 97.1 96.9 97.1 96.9
Incremental shares attributable to:        
Average dilutive restricted stock units and performance share awards (in shares) 0.8 0.5 0.7 0.5
Average number of common shares outstanding — diluted (in shares) 97.9 97.4 97.8 97.4
Basic earnings per common share (in dollars per share) $ 0.99 $ 0.93 $ 1.99 $ 1.77
Diluted earnings per common share (in dollars per share) $ 0.98 $ 0.93 $ 1.97 $ 1.76