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Business Combinations and Asset Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 11, 2025
Mar. 22, 2024
Mar. 31, 2025
Mar. 31, 2024
Business Acquisition [Line Items]        
Acquisitions, net of cash acquired     $ 237 $ 622
Whiptail Midstream Acquisition        
Business Acquisition [Line Items]        
Business Acquisition, Description of Acquired Entity On March 11, 2025, MPLX acquired gathering businesses from Whiptail Midstream, LLC for $237 million in cash. These San Juan basin assets consist primarily of crude and natural gas gathering systems in the Four Corners region, and enhance our strategic relationship with MPC.      
Acquisitions, net of cash acquired $ 237      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 172      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 41      
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Net Working Capital $ 24      
Utica Midstream        
Business Acquisition [Line Items]        
Business Acquisition, Description of Acquired Entity   On March 22, 2024, MPLX used $625 million of cash to purchase additional ownership interest in existing joint ventures and gathering assets (the “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”). After giving effect to the acquisition, MPLX owns a combined direct and indirect 73 percent interest in OGC and a 100 percent interest in OCC. In addition, MPLX acquired 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   $ 507    
Ohio Condensate Company, L.L.C.        
Business Acquisition [Line Items]        
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%    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain   $ 20    
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   $ 75