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Series B Preferred Units (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 15, 2023 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Partners' Capital Account, Distributions |  | $ 4,062 | $ 3,603 | $ 3,243
Series B Preferred Stock [Member] |  |  |  |
Partners' Capital Account, Units, Redeemed | 600,000 |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.875% |  |  |
Preferred Stock, Redemption Price Per Share | $ 1,000 |  |  |
Preferred Stock, Redemption Terms | MPLX exercised its right to redeem all 600,000 units of 6.875 percent Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (the “Series B preferred units”). MPLX paid unitholders the Series B preferred unit redemption price of $1,000 per unit. |  |  |
Partners' Capital Account, Distributions | $ 21 |  |  |
Distribution date | Feb. 15, 2023 |  |  |

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