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v3.26.1

Net Income Per Limited Partner Unit - Basic and Diluted Earnings Per Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Earnings Per Share [Abstract] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 1 | 1 | 1 | 1
Net income attributable to MPLX LP(1): | [1] | $ 1,077 | $ 1,048 | $ 1,989 | $ 2,174
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic |  | 0 | 0 | 1 | 1
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted |  | 0 | 0 | 1 | 1
Net Income (Loss) Available to Common Stockholders, Basic |  | 1,077 | 1,048 | 1,988 | 2,173
Net Income (Loss) Available to Common Stockholders, Diluted |  | $ 1,077 | $ 1,048 | $ 1,988 | $ 2,173
Weighted average units outstanding: |  |  |  |  |
Common - basic |  | 1,015 | 1,020 | 1,015 | 1,020
Common - diluted |  | 1,015 | 1,021 | 1,015 | 1,020
Per Unit Data (See Note 7) |  |  |  |  |
Common - basic |  | $ 1.06 | $ 1.03 | $ 1.96 | $ 2.13
Common - diluted |  | $ 1.06 | $ 1.03 | $ 1.96 | $ 2.13
[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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