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EQUITY (Details) - USD ($)
 1 Months Ended 12 Months Ended
Sep. 25, 2023
Feb. 29, 2024
Jan. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Aggregate amount of common shares available for issuance and sale under equity distribution agreement       $ 1,000,000,000    
Cash, dividends       (1,800,000,000) $ (1,700,000,000) $ (1,700,000,000)
Dividends, preferred stock, cash       1,100,000 1,100,000 1,100,000
Preferred stock dividends paid       $ 1,000,000 $ 1,000,000 $ 1,000,000
Issued Under Equity Agreement [Member]            
Common stock sold under equity distribution agreement (in shares)       0    
Magellan Acquisition            
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 $ 9,062,000,000          
Magellan Acquisition | Common Stock            
Equity consideration $ 8,969,000,000          
Subsequent Event            
Share repurchase, authorized amount     $ 2,000,000,000      
Stock repurchase program, period (in shares)     4 years      
Common stock, dividends, declared (in dollars per share)   $ 0.99        
Common stock, dividends, declared, annualized (in dollars per share)   $ 3.96        
Preferred stock dividends paid   $ 300,000        
Series A Preferred Stock            
Preferred stock, shares outstanding (in shares)       0    
Series B Preferred Stock            
Preferred stock, shares outstanding (in shares)       0    
Series E Preferred Stock            
Preferred stock, dividend rate (as a percent)       5.50%