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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Basic EPS      
Net income attributable to ONEOK available for common stock $ 3,034 $ 2,658 $ 1,721
Net income attributable to ONEOK available for common stock (in shares) 584.6 484.3 447.5
Net income attributable to ONEOK available for common stock (in dollars per share) $ 5.19 $ 5.49 $ 3.85
Diluted EPS      
Effect of dilutive securities $ 0 $ 0 $ 0
Effect of dilutive securities (in shares) 1.9 1.1 0.9
Net income attributable to ONEOK available for common stock and common stock equivalents $ 3,034 $ 2,658 $ 1,721
Net income attributable to ONEOK available for common stock and common stock equivalents (in shares) 586.5 485.4 448.4
Net income attributable to ONEOK available for common stock and common stock equivalents (in dollars per share) $ 5.17 $ 5.48 $ 3.84