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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic EPS
Net income attributable to ONEOK available for common stock	$ 280,773	$ 71,476	$ 545,006	$ 158,837
Shares	411,946	211,785	410,811	211,702
Basic (in dollars per share)	$ 0.68	$ 0.34	$ 1.33	$ 0.75
Diluted EPS
Effect of dilutive securities	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securities, number of shares, shares	2,695	2,227	2,596	2,105
Net income attributable to ONEOK available for common stock and common stock equivalents	$ 280,773	$ 71,476	$ 545,006	$ 158,837
Shares	414,641	214,012	413,407	213,807
Earnings Per Share, Diluted	$ 0.68	$ 0.33	$ 1.32	$ 0.74

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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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