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Investments and Noncontrolling Interests (Tables) | 3 Months Ended
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Mar. 31, 2026
Equity Method Investments and Joint Ventures [Abstract] |
Equity Method Investments | The following table presents MPLX’s equity method investments at the dates indicated:
|  |  | Ownership as of |  | Carrying value at
|  |  | March 31, |  | March 31, |  | December 31,
(In millions, except ownership percentages) | VIE |  | 2026 |  | 2026 |  | 2025
Crude Oil and Products Logistics |  |  |  |  |  |  |
Illinois Extension Pipeline Company, L.L.C. |  |  | 35% |  | $ | 219 |  |  | $ | 208 |
LOOP LLC |  |  | 41% |  | 314 |  |  | 313 |
MarEn Bakken Company LLC(1) |  |  | 25% |  | 495 |  |  | 502 |
Other(2) | X |  | 17 - 67% |  | 554 |  |  | 558 |
Total Crude Oil and Products Logistics |  |  |  |  | 1,582 |  |  | 1,581 |
Natural Gas and NGL Services |  |  |  |  |  |  |
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C. | X |  | 67% |  | 398 |  |  | 407 |
MarkWest Utica EMG, L.L.C. | X |  | 62% |  | 933 |  |  | 890 |
Ohio Gathering Company L.L.C.(3) | X |  | 32% |  | 432 |  |  | 444 |
Sherwood Midstream LLC | X |  | 50% |  | 472 |  |  | 475 |
MXP Parent, LLC |  |  | 10% |  | 223 |  |  | 198 |
Texas City Logistics LLC | X |  | 50% |  | 228 |  |  | 163 |
WPC Parent, LLC |  |  | 30% |  | 269 |  |  | 273 |
Other(2) | X |  | 10 - 51% |  | 444 |  |  | 367 |
Total Natural Gas and NGL Services |  |  |  |  | 3,399 |  |  | 3,217 |
Total |  |  |  |  | $ | 4,981 |  |  | $ | 4,798 |
(1) The investment in MarEn Bakken Company LLC includes our 9.19 percent indirect interest in a joint venture (“Dakota Access”) that owns and operates the Dakota Access Pipeline and Energy Transfer Crude Oil Pipeline projects (collectively, the “Bakken Pipeline system”). (2) Included within Other are certain equity method investments that have been deemed to be VIEs. (3) MPLX also holds a 42 percent indirect interest in Ohio Gathering Company L.L.C. through our ownership interest in MarkWest Utica EMG, L.L.C.

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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