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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2025
Fair Value Disclosures [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The following table presents the impact on the Consolidated Balance Sheets of MPLX’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2025 and 2024 by fair value hierarchy level.
| December 31,
| 2025 |  | 2024
(In millions) | Level 1 | Level 2 | Level 3 |  | Level 1 | Level 2 | Level 3
Liabilities: |  |  |  |  |  |  |
Embedded derivatives in commodity contracts |  |  |  |  |  |  |
Other current liabilities | $ | — |  | $ | — |  | $ | 6 |  |  | $ | — |  | $ | — |  | $ | 10 |
Other long-term liabilities | — |  | — |  | 35 |  |  | — |  | — |  | 48 |
Total embedded derivatives in commodity contracts | — |  | — |  | 41 |  |  | — |  | — |  | 58 |
Contingent consideration / Other long-term liabilities | — |  | — |  | 236 |  |  | — |  | — |  | — |
Total carrying value in Consolidated Balance Sheets | $ | — |  | $ | — |  | $ | 277 |  |  | $ | — |  | $ | — |  | $ | 58 |
Schedule of changes in Level 3 fair value measurements [Table Text Block] | The following table is a reconciliation of the net beginning and ending balances recorded for net liabilities classified as Level 3 in the fair value hierarchy.
(In millions) |  | 2025 |  | 2024
Beginning balance |  | $ | (58) |  |  | $ | (61) |
Contingent consideration(1) |  | (234) |  |  | — |
Unrealized and realized gain/(loss) included in Net income(2) |  | 5 |  |  | (10) |
Settlements |  | 10 |  |  | 13 |
Ending balance |  | (277) |  |  | (58) |
The amount of total gain/(loss) for the period included in earnings attributable to the change in unrealized gain/(loss) relating to liabilities still held at end of period |  | $ | 7 |  |  | $ | (7) |
(1) Liability recorded in the third quarter of 2025 related to the BANGL Acquisition earnout provision. (2) Gain/(loss) on derivatives embedded in commodity contracts are recorded in Purchased product costs in the Consolidated Statements of Income.
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The following table summarizes the fair value and carrying value of our third-party debt, excluding finance leases and unamortized debt issuance costs:
| December 31,
| 2025 |  | 2024
(In millions) | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
Outstanding debt(1) | $ | 24,887 |  |  | $ | 25,821 |  |  | $ | 19,574 |  |  | $ | 21,068 |
(1) Any amounts outstanding under the MPC Loan Agreement are not included in the table above, as the carrying value approximates fair value. This balance, if any, is reflected in Current liabilities - related parties in the Consolidated Balance Sheets.

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