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EARNINGS PER SHARE (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 EPS        
Net income attributable to ONEOK available for common stock $ 841 $ 780 $ 1,477 $ 1,419
Net income attributable to ONEOK available for common stock (in shares) 627.2 584.6 619.3 584.4
Net income attributable to ONEOK available for common stock (in dollars per share) $ 1.34 $ 1.33 $ 2.38 $ 2.43
Diluted EPS        
Effect of dilutive securities $ 0 $ 0 $ 0 $ 0
Effect of dilutive securities (in shares) 0.9 1.2 1.0 1.3
Net income attributable to ONEOK available for common stock and common stock equivalents $ 841 $ 780 $ 1,477 $ 1,419
Net income attributable to ONEOK available for common stock and common stock equivalents (in shares) 628.1 585.8 620.3 585.7
Net income attributable to ONEOK available for common stock and common stock equivalents (in dollars per share) $ 1.34 $ 1.33 $ 2.38 $ 2.42