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ACQUISITIONS AND DIVESTITURES - Schedule of Acquisition Consideration (Details) - USD ($) $ / shares in Units, $ in Millions | Oct. 15, 2024 | Sep. 25, 2023
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EnLink Acquisition |  |
Business Combination Segment Allocation [Line Items] |  |
Public common units outstanding (in shares) | 200,300,000 |
Business acquisition, share price (in dollars per share) | $ 14.90 |
Cash consideration | $ 2,985 |
Liabilities incurred | 300 |
Total consideration | $ 3,285 |
Percentage of voting interests acquired | 100.00% |
EnLink Acquisition | GIP |  |
Business Combination Segment Allocation [Line Items] |  |
Percentage of voting interests acquired | 43.00% |
Magellan Acquisition |  |
Business Combination Segment Allocation [Line Items] |  |
Public common units outstanding (in shares) |  | 202,100,000
Business acquisition, share price (in dollars per share) |  | $ 25.00
Cash consideration |  | $ 5,052
ONEOK exchange ratio per Magellan unit (in shares) |  | 0.667
Shares of ONEOK common stock issued (in shares) |  | 134,800,000
ONEOK common stock closing price on Sept (USD per share) |  | $ 66.54
Equity consideration |  | $ 9,062
Total consideration |  | 14,114
Magellan Acquisition | Common Stock |  |
Business Combination Segment Allocation [Line Items] |  |
Equity consideration |  | 8,969
Magellan Acquisition | Replacement Equity Awards |  |
Business Combination Segment Allocation [Line Items] |  |
Equity consideration |  | $ 93

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