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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
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Basic and Diluted Earnings per Common Share      
Net Income Attributable to DT Midstream $ 384 $ 370 $ 307
Average number of common shares outstanding — basic (in shares) 96.9 96.7 96.7
Incremental shares attributable to:      
Average dilutive restricted stock units and performance share awards (in shares) 0.6 0.5 0.2
Average number of common shares outstanding — diluted (in shares) 97.5 97.2 96.9
Basic earnings per common share (in dollars per share) $ 3.97 $ 3.83 $ 3.17
Diluted earnings per common share (in dollars per share) $ 3.94 $ 3.81 $ 3.16