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EQUITY (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
May 01, 2024
Nov. 14, 2023
Sep. 25, 2023
Feb. 29, 2024
Aug. 31, 2023
May 31, 2023
Feb. 28, 2023
Mar. 31, 2024
Mar. 31, 2023
Option Indexed to Issuer's Equity [Line Items]                  
Common stock dividends paid (in dollars per share)       $ 0.99       $ 0.99 $ 0.955
Preferred stock dividends               $ 0.0 $ 0.0
Forecast                  
Option Indexed to Issuer's Equity [Line Items]                  
Common stock, dividends, declared (in dollars per share) $ 99                
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    
Preferred stock dividends   $ 0.3              
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)     135,000,000            
Magellan Acquisition | Common Stock Issued                  
Option Indexed to Issuer's Equity [Line Items]                  
Equity consideration     $ 9,000.0