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EQUITY - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Feb. 03, 2025
Jan. 31, 2025
Sep. 25, 2023
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Oct. 17, 2024
Oct. 15, 2024
Jan. 31, 2024
Noncontrolling interests in consolidated subsidiaries       $ 5,097,000,000 $ 5,097,000,000 $ 0        
Aggregate amount of common shares available for issuance and sale under equity distribution agreement         $ 1,000,000,000          
Sale of stock, number of shares issued in transaction (in shares)         0          
Share repurchase, authorized amount                   $ 2,000,000,000
Repurchase of common stock         $ 172,000,000          
Cash, dividends         2,300,000,000 $ 1,800,000,000 $ 1,700,000,000      
Delaware Basin Joint Venture Gathering Limited Liability Company                    
Noncontrolling Interest in Variable Interest Entity       $ 684,000,000 $ 684,000,000          
Delaware Basin Joint Venture Gathering Limited Liability Company | Enlink                    
Ownership percentage in variable interest entity         50.10%          
Series B Preferred Stock                    
Preferred stock, convertible, conversion ratio       1.15 1.15          
Noncontrolling interests in consolidated subsidiaries       $ 515,000,000 $ 515,000,000          
Outstanding units (in shares)       27,400,000 27,400,000          
Conversion of stock (in shares)       0            
Preferred stock, shares outstanding (in shares)       0 0          
Series A Preferred Stock                    
Preferred stock, shares outstanding (in shares)       0 0          
Series C Preferred Stock                    
Preferred stock, shares outstanding (in shares)       0 0          
Subsequent Event                    
Dividends declared (in dollars per share) $ 1.03                  
Common stock, dividends, declared, annualized (in dollars per share) $ 4.12                  
EnLink Controlling Interest Acquisition                    
Percentage of voting interests acquired                 100.00%  
Noncontrolling interests       $ 5,100,000,000 $ 5,100,000,000       $ 5,076,000,000  
Business combination, acquisition of less than 100 percent, noncontrolling interest, percentage       57.00% 57.00%          
EnLink Controlling Interest Acquisition | Common Stock                    
Business acquisition, share price (in dollars per share)                 $ 14.90  
EnLink Controlling Interest Acquisition | Subsequent Event                    
Exchange ratio per acquiree share (in shares)   0.1412                
EnLink Controlling Interest Acquisition | Subsequent Event | Common Stock                    
Shares of ONEOK common stock issued (in shares)   41,000,000                
Equity consideration   $ 4,000,000,000.0                
Magellan Acquisition                    
Exchange ratio per acquiree share (in shares)     0.667              
Shares of ONEOK common stock issued (in shares)     134,800,000              
Equity consideration     $ 9,062,000,000              
Business acquisition, share price (in dollars per share)     $ 25.00              
Magellan Acquisition | Common Stock                    
Equity consideration     $ 8,969,000,000              
GIP | EnLink Controlling Interest Acquisition                    
Percentage of voting interests acquired                 43.00%  
EnLink Controlling Interest Acquisition | Series C Preferred Stock                    
Preferred stock, redemption price per share (in dollars per share)               $ 1,000    
Partners capital account, redemption price unpaid distributions (us dollars per share)               $ 8.28    
Preferred stock, redemption amount               $ 365,000,000