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Net Income Per Limited Partner Unit
 9 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Net Income Per Limited Partner Unit Net Income Per Limited Partner Unit
Net income per unit applicable to common units is computed by dividing net income attributable to MPLX LP less income allocated to participating securities by the weighted average number of common units outstanding.
During the three and nine months ended September 30, 2025 and September 30, 2024, MPLX had participating securities consisting of common units, certain equity-based compensation awards and Series A preferred units, and also had dilutive potential common units consisting of certain equity-based compensation awards. Potential common units that were anti-dilutive, and therefore omitted from the diluted earnings per unit calculation for the three and nine months ended September 30, 2025 and September 30, 2024, were less than one million.
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.