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EARNINGS PER SHARE EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic EPS
Net income attributable to ONEOK available for common stock	$ 312,984	$ 165,466	$ 857,990	$ 324,303
Shares	412,117	380,907	411,400	268,108
Earnings per share, basic	$ 0.76	$ 0.43	$ 2.09	$ 1.21
Diluted EPS
Effect of dilutive securities	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securities, number of shares	2,730	2,512	2,635	2,241
Net income attributable to ONEOK available for common stock and common stock equivalents	$ 312,984	$ 165,466	$ 857,990	$ 324,303
Shares	414,847	383,419	414,035	270,349
Earnings per share, diluted	$ 0.75	$ 0.43	$ 2.07	$ 1.20

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Basic EPS from Continuing Operations [Abstract]

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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