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ACQUISITIONS AND DIVESTITURES - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
system
Oct. 31, 2024
USD ($)
Oct. 15, 2024
USD ($)
mi
$ / shares
MMBbls
Bcf
Sep. 25, 2023
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
mi
Dec. 31, 2024
USD ($)
system
Dec. 31, 2024
USD ($)
system
Dec. 31, 2024
USD ($)
system
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2024
USD ($)
Business Acquisition [Line Items]                      
Number of wholly owned natural gas pipeline systems sold | system 3         3 3 3      
Proceeds from the sale of business (Note B) $ 1,200             $ 1,200 $ 0 $ 0  
Gain of other operating income               227 0 0  
Magellan Acquisition measurement period adjustments               165      
Business combination, total costs               96 179    
Enlink                      
Business Acquisition [Line Items]                      
Subsidiary, ownership percentage, parent     57.00%                
Senior Notes                      
Business Acquisition [Line Items]                      
Debt instrument, face amount $ 7,000         $ 7,000 $ 7,000 7,000 5,250 $ 750 $ 7,000
Proceeds from issuance of senior debt               6,900 $ 5,200    
EnLink Controlling Interest Acquisition                      
Business Acquisition [Line Items]                      
Percentage of voting interests acquired     100.00%                
Cash consideration     $ 3,300                
Miles of pipeline acquired | mi     14,000                
Operating storage processing capacity | Bcf     3.9                
Operating storage fractionators capacity, per day | MMBbls     0.235                
Goodwill, expected tax deductible amount     $ 0                
Business combination, revenue             1,500        
Business combination, net income             $ 173        
EnLink Controlling Interest Acquisition | Common Stock                      
Business Acquisition [Line Items]                      
Business acquisition, share price (in dollars per share) | $ / shares     $ 14.90                
Cash consideration     $ 300                
Medallion Acquisition                      
Business Acquisition [Line Items]                      
Business combination, revenue           256          
Business combination, net income           $ 43          
Consideration transferred   $ 2,600                  
Magellan Acquisition                      
Business Acquisition [Line Items]                      
Business acquisition, share price (in dollars per share) | $ / shares       $ 25.00              
Cash consideration       $ 5,052              
Exchange ratio per acquiree share (in shares) | shares       0.667              
Shares of ONEOK common stock issued (in shares) | shares       134,800,000              
Equity consideration       $ 9,062              
Consideration transferred       14,114              
Proceeds from issuance of senior debt       5,250              
Magellan Acquisition measurement period adjustments               165      
Property, plant and equipment, adjustment               $ 100      
Magellan Acquisition | Common Stock                      
Business Acquisition [Line Items]                      
Equity consideration       $ 8,969              
Gulf Coast NGL Pipelines Acquisition                      
Business Acquisition [Line Items]                      
Consideration transferred         $ 280            
Length of natural gas pipeline | mi         450            
GIP | EnLink Controlling Interest Acquisition                      
Business Acquisition [Line Items]                      
Percentage of voting interests acquired     43.00%