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Net Income Per Limited Partner Unit - Basic and Diluted Earnings Per Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Net income attributable to MPLX LP(1): [1] $ 1,545 $ 1,037 $ 3,719 $ 3,218
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 1 0 2 7
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted 1 0 2 7
Net Income (Loss) Available to Common Stockholders, Basic 1,544 1,031 3,717 3,190
Net Income (Loss) Available to Common Stockholders, Diluted $ 1,544 $ 1,031 $ 3,717 $ 3,190
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1 1 1 1
Weighted average units outstanding:        
Common - basic 1,019 1,020 1,020 1,016
Common - diluted 1,019 1,020 1,020 1,016
Per Unit Data (See Note 7)        
Common - basic $ 1.52 $ 1.01 $ 3.65 $ 3.14
Common - diluted $ 1.52 $ 1.01 $ 3.65 $ 3.14
Series A Preferred Stock [Member]        
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Distributed Earnings $ 0 $ 6 $ 0 $ 21
[1] Allocation of net income attributable to MPLX LP assumes all earnings for the period have been distributed based on the distribution priorities applicable to the period.