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Net Income (Loss) Per Limited Partner Unit (Tables)
 12 Months Ended
Dec. 31, 2025
Earnings Per Share [Abstract]  
Schedule of Net Income Per Unit, Basic and Diluted [Table Text Block]
(In millions, except per unit data)202520242023
Net income attributable to MPLX LP(1):
$4,912 $4,317 $3,928 
Less: Distributions declared on Series A preferred units— 27 94 
Distributions declared on Series B preferred units— — 5 
Distributed and undistributed earnings allocated to other participating securities
3 9 16 
Impact of redemption of Series B preferred units— — 5 
Net Income available to common unitholders$4,909 $4,281 $3,808 
Weighted average units outstanding:
Basic1,019 1,016 1,001 
Diluted1,019 1,017 1,002 
Net income attributable to MPLX LP per limited partner unit:
Basic$4.82 $4.21 $3.80 
Diluted$4.82 $4.21 $3.80 
(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.
 [1]
[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.