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MAGELLAN ACQUISITION - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 25, 2023 USD ($) terminal mi condensateSplitter unconsolidatedAffiliate pensionPlan $ / shares shares | Aug. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of unconsolidated affiliates | unconsolidatedAffiliate |  | 8 |  |  |  |  |
Medford settlement gain |  |  |  |  |  | $ 779 | $ 0
Business Interruption - Settlement Proceeds | Medford Incident |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Medford settlement gain |  |  |  |  | $ 779 | 779 |
Magellan Acquisition |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
ONEOK exchange ratio per Magellan unit (in shares) | shares |  | 0.667 |  |  |  |  |
Cash consideration per Magellan unit (in dollars per share) | $ / shares |  | $ 25.00 |  |  |  |  |
Total consideration |  | $ 14,114 |  |  |  |  |
Shares of ONEOK common stock issued (in shares) | shares |  | 134,800,000 |  |  |  |  |
Equity consideration |  | $ 9,062 |  |  |  |  |
Proceeds from issuance of senior debt |  | 5,250 |  |  |  |  |
Extinguishment of debt |  | $ 5,250 |  |  |  |  |
Pipeline length (in miles) | mi |  | 9,800 |  |  |  |  |
Crude oil pipeline length (in miles) | mi |  | 1,000 |  |  |  |  |
Number of pipeline terminals | terminal |  | 54 |  |  |  |  |
Number of marine terminals | terminal |  | 1 |  |  |  |  |
Condensate splitters | condensateSplitter |  | 1 |  |  |  |  |
Storage capacity | terminal |  | 3 |  |  |  |  |
Liability, retirement and postemployment benefits |  | $ 71 |  |  |  |  |
Number of pension plans | pensionPlan |  | 2 |  |  |  |  |
Business combination, revenue | $ 72 |  |  |  |  |  |
Business combination, net income | $ 29 |  |  |  |  |  |
Non-recurring transaction costs |  |  |  | $ 136 |  | $ 154 |
Magellan Acquisition | Senior Notes |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of senior debt |  |  | $ 5,200 |  |  |  |
Debt, face amount |  | $ 5,250 |  |  |  |  |
Magellan Acquisition | Common Stock |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equity consideration |  | $ 8,969 |  |  |  |  |

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