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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Basic EPS    
Net income attributable to ONEOK available for common stock $ 636 $ 639
Net income attributable to ONEOK available for common stock (in shares) 611.4 584.2
Net income attributable to ONEOK available for common stock (in dollars per share) $ 1.04 $ 1.09
Diluted EPS    
Effect of dilutive securities $ 0 $ 0
Effect of dilutive securities (in shares) 1.1 1.5
Net income attributable to ONEOK available for common stock and common stock equivalents $ 636 $ 639
Net income attributable to ONEOK available for common stock and common stock equivalents (in shares) 612.5 585.7
Net income attributable to ONEOK available for common stock and common stock equivalents (in dollars per share) $ 1.04 $ 1.09