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MAGELLAN ACQUISITION - Narrative (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 25, 2023
USD ($)
unconsolidatedAffiliate
mi
terminal
$ / shares
shares
MMBbls
Aug. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Business Acquisition [Line Items]              
Number of unconsolidated affiliates | unconsolidatedAffiliate 8            
Net income         $ 2,659 $ 1,722 $ 1,500
Medford settlement gain         779 $ 0 $ 0
Business Interruption - Settlement Proceeds | Medford Incident              
Business Acquisition [Line Items]              
Medford settlement gain         779    
Senior Notes              
Business Acquisition [Line Items]              
Extinguishment of debt         322    
Magellan Acquisition              
Business Acquisition [Line Items]              
ONEOK exchange ratio per Magellan unit (in shares) | shares 0.667            
Cash consideration per Magellan unit (in dollars per share) | $ / shares $ 25.00            
Consideration transferred $ 14,114            
Shares of ONEOK common stock issued (in shares) | shares 134,800,000            
Equity consideration $ 9,062            
Proceeds from issuance of senior debt 5,250            
Extinguishment of debt $ 5,250            
Pipeline length (in miles) | mi 9,800            
Number of marine terminals | terminal 2            
Number of pipeline terminals | terminal 54            
Crude oil pipeline length (in miles) | mi 1,000            
Operating storage capacity (MMBbls) | MMBbls 91            
Goodwill adjustment     $ 729        
Intangibles adjustment     479        
Property, plant and equipment, adjustment     $ 189        
Business combination, revenue       $ 1,100      
Business combination, net income       $ 361      
Non-recurring transaction costs         $ 179    
Magellan Acquisition | Senior Notes              
Business Acquisition [Line Items]              
Proceeds from issuance of senior debt   $ 5,200          
Debt instrument, face amount $ 5,250            
Magellan Acquisition | Common Stock              
Business Acquisition [Line Items]              
Equity consideration $ 8,969