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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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