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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
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Earnings Per Share [Abstract] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 1 | 1
Net income attributable to MPLX LP(1): | [1] | $ 912 | $ 1,126
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic |  | 1 | 0
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted |  | 1 | 0
Net Income (Loss) Available to Common Stockholders, Basic |  | 911 | 1,126
Net Income (Loss) Available to Common Stockholders, Diluted |  | $ 911 | $ 1,126
Weighted average units outstanding: |  |  |
Common - basic |  | 1,015 | 1,020
Common - diluted |  | 1,015 | 1,020
Per Unit Data (See Note 7) |  |  |
Common - basic |  | $ 0.90 | $ 1.10
Common - 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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