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EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 14, 2023 | Nov. 01, 2023 | Sep. 25, 2023 | Aug. 31, 2023 | May 31, 2023 | Feb. 28, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022
Option Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends paid (in dollars per share) |  |  |  | $ 0.955 | $ 0.955 | $ 0.955 | $ 0.955 | $ 0.955 | $ 0.955 | $ 0.935 | $ 0.935 | $ 0.935
Preferred stock dividends |  |  |  |  |  |  | $ 1.0 | $ 0.0 | $ 0.0 | $ 1.0 | $ 0.0 | $ 0.0
Forecast |  |  |  |  |  |  |  |  |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends, declared (in dollars per share) |  | $ 0.955 |  |  |  |  |  |  |  |  |  |
Magellan Acquisition |  |  |  |  |  |  |  |  |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ONEOK exchange ratio per Magellan unit (in shares) |  |  | 0.667 |  |  |  |  |  |  |  |  |
Cash consideration per Magellan unit (in dollars per share) |  |  | $ 25.00 |  |  |  |  |  |  |  |  |
Shares of ONEOK common stock issued (in shares) |  |  | 134,800,000 |  |  |  |  |  |  |  |  |
Equity consideration |  |  | $ 9,062.0 |  |  |  |  |  |  |  |  |
Magellan Acquisition | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity consideration |  |  | $ 8,969.0 |  |  |  |  |  |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage (as a percent) |  |  |  |  |  |  | 5.50% |  |  |  |  |
Dividends, preferred stock, cash paid |  |  |  | $ 0.3 | $ 0.3 | $ 0.3 |  |  |  |  |  |
Series E Preferred Stock | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends | $ 0.3 |  |  |  |  |  |  |  |  |  |  |

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