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Net Income Per Limited Partner Unit (Tables)
 9 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Schedule of Net Income Per Unit, Basic and Diluted
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In millions, except per unit data)2025202420252024
Net income attributable to MPLX LP(1):
$1,545 $1,037 $3,719 $3,218 
Less: Distributions declared on Series A preferred units— 6 — 21 
Distributed and undistributed earnings allocated to other participating securities1 — 2 7 
Net Income available to common unitholders$1,544 $1,031 $3,717 $3,190 
Weighted average units outstanding:
Basic1,019 1,020 1,020 1,016 
Diluted1,019 1,020 1,020 1,016 
Net income attributable to MPLX LP per limited partner unit:
Basic$1.52 $1.01 $3.65 $3.14 
Diluted$1.52 $1.01 $3.65 $3.14 
(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.