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Net Income Per Limited Partner Unit (Tables)
 3 Months Ended
Mar. 31, 2024
Earnings Per Share [Abstract]  
Schedule of Net Income Per Unit, Basic and Diluted
Three Months Ended 
March 31,
(In millions, except per unit data)20242023
Net income attributable to MPLX LP(1):
$1,005 $943 
Less: Distributions declared on Series A preferred units10 23 
Distributions declared on Series B preferred units— 5 
Undistributed earnings allocated to participating securities3 4 
Impact of redemption of Series B preferred units— 5 
Net Income available to common unitholders$992 $906 
Weighted average units outstanding:
Basic1,008 1,001 
Diluted1,008 1,001 
Net income attributable to MPLX LP per limited partner unit:
Basic$0.98 $0.91 
Diluted$0.98 $0.91 
(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.