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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic EPS
Net income available for common stock	$ 308,880	$ 312,984	$ 957,501	$ 857,990
Shares	413,816	412,117	413,443	411,400
Earnings per share, basic	$ 0.75	$ 0.76	$ 2.32	$ 2.09
Diluted EPS
Effect of dilutive securities	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securities, number of shares	1,762	2,730	1,834	2,635
Net income attributable to ONEOK available for common stock and common stock equivalents	$ 308,880	$ 312,984	$ 957,501	$ 857,990
Shares	415,578	414,847	415,277	414,035
Earnings per share, diluted	$ 0.74	$ 0.75	$ 2.31	$ 2.07

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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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