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Net Income Per Limited Partner Unit (Tables) | 3 Months Ended
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Mar. 31, 2026
Earnings Per Share [Abstract] |
Schedule of Net Income Per Unit, Basic and Diluted |
| Three Months Ended March 31, |  |
(In millions, except per unit data) | 2026 |  | 2025 |  |  |  |
Net income attributable to MPLX LP(1): | $ | 912 |  |  | $ | 1,126 |  |  |  |  |
Less: Distributed and undistributed earnings allocated to other participating securities | 1 |  |  | — |  |  |  |  |
Net Income available to common unitholders | $ | 911 |  |  | $ | 1,126 |  |  |  |  |
Weighted average units outstanding: |  |  |  |  |  |  |
Basic | 1,015 |  |  | 1,020 |  |  |  |  |
Diluted | 1,015 |  |  | 1,020 |  |  |  |  |
Net income attributable to MPLX LP per limited partner unit: |  |  |  |  |  |  |
Basic | $ | 0.90 |  |  | $ | 1.10 |  |  |  |  |
Diluted | $ | 0.90 |  |  | $ | 1.10 |  |  |  |  |
(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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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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