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MAGELLAN ACQUISITION - Narrative (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 25, 2023 USD ($) unconsolidatedAffiliate mi terminal $ / shares shares MMBbls | Aug. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of unconsolidated affiliates | unconsolidatedAffiliate | 8 |  |  |  |  |  |
Net income |  |  |  |  | $ 2,659 | $ 1,722 | $ 1,500
Medford settlement gain |  |  |  |  | 779 | $ 0 | $ 0
Business Interruption - Settlement Proceeds | Medford Incident |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Medford settlement gain |  |  |  |  | 779 |  |
Senior Notes |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  | 322 |  |
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 |  |  |  |  |  |
Consideration transferred | $ 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 |  |  |  |  |  |
Number of marine terminals | terminal | 2 |  |  |  |  |  |
Number of pipeline terminals | terminal | 54 |  |  |  |  |  |
Crude oil pipeline length (in miles) | mi | 1,000 |  |  |  |  |  |
Operating storage capacity (MMBbls) | MMBbls | 91 |  |  |  |  |  |
Goodwill adjustment |  |  | $ 729 |  |  |  |
Intangibles adjustment |  |  | 479 |  |  |  |
Property, plant and equipment, adjustment |  |  | $ 189 |  |  |  |
Business combination, revenue |  |  |  | $ 1,100 |  |  |
Business combination, net income |  |  |  | $ 361 |  |  |
Non-recurring transaction costs |  |  |  |  | $ 179 |  |
Magellan Acquisition | Senior Notes |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of senior debt |  | $ 5,200 |  |  |  |  |
Debt instrument, face amount | $ 5,250 |  |  |  |  |  |
Magellan Acquisition | Common Stock |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equity consideration | $ 8,969 |  |  |  |  |  |

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