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MAGELLAN ACQUISITION - Goodwill Related To Acquisition (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Goodwill [Line Items]    
Gross goodwill   $ 681
Accumulated impairment losses   (153)
Goodwill [Roll Forward]    
Goodwill beginning balance $ 528  
Acquisitions 5,154  
Goodwill, ending balance 5,682  
Natural Gas Gathering and Processing    
Goodwill [Line Items]    
Gross goodwill   153
Accumulated impairment losses   (153)
Goodwill [Roll Forward]    
Goodwill beginning balance 0  
Acquisitions 0  
Goodwill, ending balance 0  
Natural Gas Liquids    
Goodwill [Line Items]    
Gross goodwill   371
Accumulated impairment losses   0
Goodwill [Roll Forward]    
Goodwill beginning balance 371  
Acquisitions 0  
Goodwill, ending balance 371  
Natural Gas Pipelines    
Goodwill [Line Items]    
Gross goodwill   157
Accumulated impairment losses   0
Goodwill [Roll Forward]    
Goodwill beginning balance 157  
Acquisitions 0  
Goodwill, ending balance 157  
Refined Products and Crude    
Goodwill [Line Items]    
Gross goodwill   0
Accumulated impairment losses   $ 0
Goodwill [Roll Forward]    
Goodwill beginning balance 0  
Acquisitions 5,154  
Goodwill, ending balance $ 5,154