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Acquisitions and Other Transactions (MarkWest Torñado GP, L.L.C.) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 15, 2023
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Business Combination [Line Items]        
Contract with Customer, Asset, before Allowance for Credit Loss, Noncurrent   $ 4 $ 0 $ 1
Equity method investments   4,798 4,531  
Equity Interest in Acquiree, Remeasurement Gain   $ 484 $ 20 $ 92
MarkWest Tornado GP, L.L.C.        
Business Combination [Line Items]        
Equity Method Investment, Remaining Ownership Interest Purchased 40.00%      
Payments to Acquire Additional Interest in Subsidiaries $ 303      
Payments to Acquire Businesses, Gross 270      
Contract with Customer, Asset, before Allowance for Credit Loss, Noncurrent $ 33      
Business Combination, Achieved in Stages, Preacquisition and Acquired Equity Interests in Acquiree, Percentage 100.00%      
Equity Interest in Acquiree, Percentage 60.00%      
Equity method investments $ 311      
Equity Interest in Acquiree, Remeasurement Gain 92      
Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 673