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Net Income Per Limited Partner Unit (Basic and Diluted Earnings Per Unit) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net income attributable to MPLX LP:      
Net income attributable to MPLX LP(1): [1] $ 4,912 $ 4,317 $ 3,928
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 3 9 16
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted 3 9 16
Impact of redemption of Series B preferred units 0 0 5
Net Income Available to Common Unitholders, Basic 4,909 4,281 3,808
Net Income Available to Common Unitholders, Diluted $ 4,909 $ 4,281 $ 3,808
Weighted average units outstanding:      
Basic (shares) 1,019 1,016 1,001
Diluted (shares) 1,019 1,017 1,002
Net income attributable to MPLX LP per limited partner unit:      
Basic (in USD per unit) $ 4.82 $ 4.21 $ 3.80
Diluted (in USD per unit) $ 4.82 $ 4.21 $ 3.80
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1 1 1
Series A Preferred Stock [Member]      
Net income attributable to MPLX LP:      
Distributions declared on preferred units $ 0 $ 27 $ 94
Series B Preferred Stock [Member]      
Net income attributable to MPLX LP:      
Distributions declared on preferred units $ 0 $ 0 $ 5
[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.