v3.25.2
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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Basic and Diluted Earnings per Common Share        
Net Income Attributable to DT Midstream $ 107 $ 96 $ 215 $ 193
Average number of common shares outstanding — basic (in shares) 101.6 97.1 101.5 97.1
Incremental shares attributable to:        
Average dilutive restricted stock units and performance share awards (in shares) 0.9 0.8 1.0 0.7
Average number of common shares outstanding — diluted (in shares) 102.5 97.9 102.5 97.8
Basic earnings per Common Share (in dollars per share) $ 1.05 $ 0.99 $ 2.12 $ 1.99
Diluted earnings per Common Share (in dollars per share) $ 1.04 $ 0.98 $ 2.10 $ 1.97