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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivative Instruments, Gain (Loss) [Table Text Block] | 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:
(In millions) | 2025 |  | 2024 |  | 2023
Product sales |  |  |  |  |
Realized gain | $ | — |  |  | $ | 1 |  |  | $ | 7 |
Product sales derivative gain | — |  |  | 1 |  |  | 7 |
Purchased product costs |  |  |  |  |
Realized loss | (10) |  |  | (13) |  |  | (11) |
Unrealized gain | 17 |  |  | 3 |  |  | — |
Purchased product cost derivative (loss)/gain | 7 |  |  | (10) |  |  | (11) |
Total derivative (loss)/gain included in Net Income | $ | 7 |  |  | $ | (9) |  |  | $ | (4) |

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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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