EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Basic EPS | ||||
| Net income attributable to ONEOK available for common stock | $ 966 | $ 841 | $ 1,740 | $ 1,477 |
| Net income attributable to ONEOK available for common stock (in shares) | 630.9 | 627.2 | 630.8 | 619.3 |
| Net income attributable to ONEOK available for common stock (in dollars per share) | $ 1.53 | $ 1.34 | $ 2.76 | $ 2.38 |
| Diluted EPS | ||||
| Effect of dilutive securities | $ 0 | $ 0 | $ 0 | $ 0 |
| Effect of dilutive securities (in shares) | 1.1 | 0.9 | 1.0 | 1.0 |
| Net income available to common shareholders - diluted | $ 966 | $ 841 | $ 1,740 | $ 1,477 |
| Net income attributable to ONEOK available for common stock and common stock equivalents (in shares) | 632.0 | 628.1 | 631.8 | 620.3 |
| Net income attributable to ONEOK available for common stock and common stock equivalents (in dollars per share) | $ 1.53 | $ 1.34 | $ 2.75 | $ 2.38 |
| X | ||||||||||
- Definition Basic EPS from Continuing Operations [Abstract] No definition available.
|
| X | ||||||||||
- Definition Diluted EPS from Continuing Operations [Abstract] No definition available.
|
| X | ||||||||||
- Definition 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|