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Derivative Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2026
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments, Gain (Loss) | The impact of MPLX’s derivative contracts not designated as hedging instruments and the location of gains and losses recognized in the Consolidated Statements of Income is summarized below:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2026 |  | 2025 |  | 2026 |  | 2025
Product sales |  |  |  |  |  |  |
Realized loss | $ | (3) |  |  | $ | — |  |  | $ | (4) |  |  | $ | — |
Unrealized gain/(loss) | 5 |  |  | — |  |  | (2) |  |  | — |
Product sales gain/(loss) | 2 |  |  | — |  |  | (6) |  |  | — |
Service revenue - product related |  |  |  |  |  |  |
Realized loss | (17) |  |  | — |  |  | (21) |  |  | — |
Unrealized gain/(loss) | 32 |  |  | — |  |  | (12) |  |  | — |
Service revenue - product related gain/(loss) | 15 |  |  | — |  |  | (33) |  |  | — |
Purchased product costs |  |  |  |  |  |  |
Realized loss | (3) |  |  | (3) |  |  | (5) |  |  | (6) |
Unrealized gain/(loss) | 7 |  |  | 7 |  |  | (6) |  |  | 3 |
Purchased product costs gain/(loss) | 4 |  |  | 4 |  |  | (11) |  |  | (3) |
Total derivative gain/(loss) included in Net income | $ | 21 |  |  | $ | 4 |  |  | $ | (50) |  |  | $ | (3) |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value | The following table presents the fair value of derivative instruments as of June 30, 2026 and December 31, 2025, and the line items in the Consolidated Balance Sheets in which the fair values are reflected. As of June 30, 2026 and December 31, 2025, there were no derivative assets or liabilities that were offset in the Consolidated Balance Sheets.
(In millions) | June 30, 2026 |  | December 31, 2025 |  |
Commodity derivatives |  |  |  |  |  |  |
Current liabilities - related parties | $ | 14 |  |  | $ | — |  |  |  |  |
Other current liabilities(1) | 9 |  |  | 6 |  |  |  |  |
Other long-term liabilities(1) | 38 |  |  | 35 |  |  |  |  |
(1) Includes embedded derivatives.

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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