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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Basic EPS        
Net income attributable to ONEOK available for common stock $ 939 $ 692 $ 2,416 $ 2,111
Net income attributable to ONEOK available for common stock (in shares) 630.6 584.8 623.1 584.5
Net income attributable to ONEOK available for common stock (in dollars per share) $ 1.49 $ 1.18 $ 3.88 $ 3.61
Diluted EPS        
Effect of dilutive securities $ 0 $ 0 $ 0 $ 0
Effect of dilutive securities (in shares) 0.9 1.9 1.0 1.6
Net income available to common shareholders - diluted $ 939 $ 692 $ 2,416 $ 2,111
Net income attributable to ONEOK available for common stock and common stock equivalents (in shares) 631.5 586.7 624.1 586.1
Net income attributable to ONEOK available for common stock and common stock equivalents (in dollars per share) $ 1.49 $ 1.18 $ 3.87 $ 3.60