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Acquisitions and Other Transactions (MarkWest Tornado GP, L.L.C. - Assets Acquired and Liabilities Assumed) (Details) - MarkWest Tornado GP, L.L.C.
$ in Millions
Dec. 15, 2023
USD ($)
Business Combination [Line Items]  
Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment $ 585
Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 75
Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital, Net 30
Recognized Identifiable Other Long-term Assets Acquired and Liabilities Assumed, Net (17)
Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 673