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Net Income Per Limited Partner Unit
 3 Months Ended
Mar. 31, 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 months ended March 31, 2025 and March 31, 2024, MPLX had participating securities consisting of common units, certain equity-based compensation awards, Series A preferred units, and also had dilutive potential common units consisting of certain equity-based compensation awards. Potential common units omitted from the diluted earnings per unit calculation for the three months ended March 31, 2025 and March 31, 2024 were less than 1 million.
Three Months Ended 
March 31,
(In millions, except per unit data)20252024
Net income attributable to MPLX LP(1):
$1,126 $1,005 
Less: Distributions declared on Series A preferred units— 10 
Undistributed earnings allocated to participating securities— 3 
Net Income available to common unitholders$1,126 $992 
Weighted average units outstanding:
Basic1,020 1,008 
Diluted1,020 1,008 
Net income attributable to MPLX LP per limited partner unit:
Basic$1.10 $0.98 
Diluted$1.10 $0.98 
(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.