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v3.25.4

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.

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