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ACQUISITIONS - Narrative (Details)
shares in Millions, $ in Millions
3 Months Ended
Jan. 31, 2025
USD ($)
shares
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Business Acquisition [Line Items]      
Transaction costs   $ 42 $ 3
EnLink Acquisition      
Business Acquisition [Line Items]      
Exchange ratio per Magellan unit 0.1412    
Noncontrolling interests in consolidated subsidiaries $ 4,378    
Transaction costs   42  
EnLink Acquisition | Advisory Fees and Severance      
Business Acquisition [Line Items]      
Transaction costs   31  
EnLink Acquisition | Noncash Compensation Expense      
Business Acquisition [Line Items]      
Transaction costs   $ 11  
EnLink Acquisition | Common Stock      
Business Acquisition [Line Items]      
Shares of common stock issued (in shares) | shares 41    
Equity consideration $ 4,000