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MAGELLAN ACQUISITION - Narrative (Details) - Magellan Acquisition $ / shares in Units, $ in Millions	Sep. 25, 2023 USD ($) $ / shares shares
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
Business combination, consideration transferred	$ 14,100
Shares of ONEOK common stock issued (in shares) | shares	135,000,000
Proceeds from issuance of senior debt	$ 5,250
Common Stock Issued
Business Acquisition [Line Items]
Equity consideration	$ 9,000

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Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share

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