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ACQUISITIONS - Narrative (Details) $ / shares in Units, $ in Millions			6 Months Ended
	Jun. 17, 2024 USD ($) mi	Sep. 25, 2023 USD ($) $ / shares shares	Jun. 30, 2024 USD ($)
Gulf Coast NGL Pipelines Acquisition
Business Acquisition [Line Items]
Business combination, consideration transferred	$ 280
Length of natural gas pipeline | mi	450
Magellan Acquisition
Business Acquisition [Line Items]
Business combination, consideration transferred		$ 14,100
ONEOK exchange ratio per Magellan unit (in shares) | shares		0.667
Cash consideration per Magellan unit (in dollars per share) | $ / shares		$ 25.00
Shares of ONEOK common stock issued (in shares) | shares		135,000,000
Proceeds from issuance of senior debt		$ 5,250
Goodwill, measurement period adjustment			$ 160
Decrease in property, plant and equipment			$ 100
Magellan Acquisition | Common Stock Issued
Business Acquisition [Line Items]
Equity consideration		$ 9,000

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