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EARNINGS PER SHARE EARNINGS PER SHARE (Notes) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | EARNINGS PER SHARE The following tables set forth the computation of basic and diluted EPS for the periods indicated:
| Three Months Ended June 30, 2018
| Income |  | Shares |  | Per Share Amount
| (Thousands, except per share amounts)
Basic EPS |  |  |  |  |
Net income attributable to ONEOK available for common stock | $ | 280,773 |  |  | 411,946 |  |  | $ | 0.68 |
Diluted EPS |  |  |  |  |  |  |
Effect of dilutive securities | — |  |  | 2,695 |  |  |  |
Net income attributable to ONEOK available for common stock and common stock equivalents | $ | 280,773 |  |  | 414,641 |  |  | $ | 0.68 |
| Three Months Ended June 30, 2017
| Income |  | Shares |  | Per Share Amount
| (Thousands, except per share amounts)
Basic EPS |  |  |  |  |
Net income attributable to ONEOK available for common stock | $ | 71,476 |  |  | 211,785 |  |  | $ | 0.34 |
Diluted EPS |  |  |  |  |  |  |
Effect of dilutive securities | — |  |  | 2,227 |  |  |  |
Net income attributable to ONEOK available for common stock and common stock equivalents | $ | 71,476 |  |  | 214,012 |  |  | $ | 0.33 |
| Six Months Ended June 30, 2018
| Income |  | Shares |  | Per Share Amount
| (Thousands, except per share amounts)
Basic EPS |  |  |  |  |
Net income attributable to ONEOK available for common stock | $ | 545,006 |  |  | 410,811 |  |  | $ | 1.33 |
Diluted EPS |  |  |  |  |  |  |
Effect of dilutive securities | — |  |  | 2,596 |  |  |  |
Net income attributable to ONEOK available for common stock and common stock equivalents | $ | 545,006 |  |  | 413,407 |  |  | $ | 1.32 |
| Six Months Ended June 30, 2017
| Income |  | Shares |  | Per Share Amount
| (Thousands, except per share amounts)
Basic EPS |  |  |  |  |
Net income attributable to ONEOK available for common stock | $ | 158,837 |  |  | 211,702 |  |  | $ | 0.75 |
Diluted EPS |  |  |  |  |  |  |
Effect of dilutive securities | — |  |  | 2,105 |  |  |  |
Net income attributable to ONEOK available for common stock and common stock equivalents | $ | 158,837 |  |  | 213,807 |  |  | $ | 0.74 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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