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Net Income Per Limited Partner Unit (Tables)
3 Months Ended
Mar. 31, 2025
Earnings Per Share [Abstract]  
Schedule of Net Income Per Unit, Basic and Diluted
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— 
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.