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Business Combinations and Asset Acquisitions (Details)
$ in Millions
Mar. 22, 2024
USD ($)
Utica Midstream  
Business Acquisition [Line Items]  
Business Acquisition, Description of Acquired Entity On March 22, 2024, MPLX used $625 million of cash on hand to purchase additional ownership interest in existing joint ventures and gathering assets (“Utica Midstream Acquisition”), which will enhance our position in the Utica basin. Prior to the acquisition, we owned an indirect interest in Ohio Gathering Company L.L.C. (“OGC”) and a direct interest in Ohio Condensate Company L.L.C. (“OCC”) and now own a combined 73 percent interest in OGC, a 100 percent interest in OCC, and a 100 percent interest in a dry gas gathering system in the Utica basin, including 53 miles of gathering pipeline and three dehydration units with a combined capacity of approximately 620 MMcf/d.
Payments to Acquire Businesses, Gross $ 625
Business Acquisition, Percentage of Voting Interests Acquired 100.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 625
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets $ 518
Ohio Gathering Company L.L.C.  
Business Acquisition [Line Items]  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage 73.00%
Difference between carrying amount and underlying equity $ 86
Ohio Condensate Company, L.L.C.  
Business Acquisition [Line Items]  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain $ 20
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage 100.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage 62.00%