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EARNINGS PER SHARE EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic EPS
Net income available for common stock	$ 311,688	$ 280,773	$ 648,621	$ 545,006
Shares	413,606	411,946	413,257	410,811
Earnings per share, basic	$ 0.75	$ 0.68	$ 1.57	$ 1.33
Diluted EPS
Effect of dilutive securities	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securities, number of shares	1,443	2,695	1,884	2,596
Net income attributable to ONEOK available for common stock and common stock equivalents	$ 311,688	$ 280,773	$ 648,621	$ 545,006
Shares	415,049	414,641	415,141	413,407
Earnings per share, diluted	$ 0.75	$ 0.68	$ 1.56	$ 1.32

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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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