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EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions				1 Months Ended			3 Months Ended
	Nov. 14, 2023	Nov. 01, 2023	Sep. 25, 2023	Aug. 31, 2023	May 31, 2023	Feb. 28, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Option Indexed to Issuer's Equity [Line Items]
Common stock dividends paid (in dollars per share)				$ 0.955	$ 0.955	$ 0.955	$ 0.955	$ 0.955	$ 0.955	$ 0.935	$ 0.935	$ 0.935
Preferred stock dividends							$ 1.0	$ 0.0	$ 0.0	$ 1.0	$ 0.0	$ 0.0
Forecast
Option Indexed to Issuer's Equity [Line Items]
Common stock, dividends, declared (in dollars per share)		$ 0.955
Magellan Acquisition
Option Indexed to Issuer's Equity [Line Items]
ONEOK exchange ratio per Magellan unit (in shares)			0.667
Cash consideration per Magellan unit (in dollars per share)			$ 25.00
Shares of ONEOK common stock issued (in shares)			134,800,000
Equity consideration			$ 9,062.0
Magellan Acquisition | Common Stock
Option Indexed to Issuer's Equity [Line Items]
Equity consideration			$ 8,969.0
Series E Preferred Stock
Option Indexed to Issuer's Equity [Line Items]
Preferred stock, dividend rate, percentage (as a percent)							5.50%
Dividends, preferred stock, cash paid				$ 0.3	$ 0.3	$ 0.3
Series E Preferred Stock | Forecast
Option Indexed to Issuer's Equity [Line Items]
Preferred stock dividends	$ 0.3

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