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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
Mar. 31, 2025
Mar. 31, 2024
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Net income attributable to MPLX LP(1): [1] $ 1,126 $ 1,005
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 0 3
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted 0 3
Net Income (Loss) Available to Common Stockholders, Basic 1,126 992
Net Income (Loss) Available to Common Stockholders, Diluted $ 1,126 $ 992
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1 1
Weighted average units outstanding:    
Common - basic 1,020 1,008
Common - diluted 1,020 1,008
Net income attributable to MPLX LP per limited partner unit:    
Common - basic $ 1.10 $ 0.98
Common - diluted $ 1.10 $ 0.98
Series A Preferred Stock [Member]    
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Distributed Earnings $ 0 $ 10
[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.