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Investments and Noncontrolling Interests (Tables) | 3 Months Ended
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Mar. 31, 2025
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 |  | 2025 |  | 2025 |  | 2024
Crude Oil and Products Logistics |  |  |  |  |  |  |
Illinois Extension Pipeline Company, L.L.C. |  |  | 35% |  | $ | 225 |  |  | $ | 218 |
LOOP LLC |  |  | 41% |  | 314 |  |  | 310 |
MarEn Bakken Company LLC(1) |  |  | 25% |  | 521 |  |  | 526 |
Other(2) | X |  |  |  | 546 |  |  | 541 |
Total Crude Oil and Products Logistics |  |  |  |  | 1,606 |  |  | 1,595 |
Natural Gas and NGL Services |  |  |  |  |  |  |
BANGL, LLC |  |  | 45% |  | 279 |  |  | 281 |
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C(3) | X |  | 67% |  | 428 |  |  | 329 |
MarkWest Utica EMG, L.L.C. | X |  | 60% |  | 782 |  |  | 742 |
Ohio Gathering Company L.L.C.(4) | X |  | 34% |  | 464 |  |  | 470 |
Sherwood Midstream LLC | X |  | 50% |  | 485 |  |  | 488 |
WPC Parent, LLC |  |  | 30% |  | 243 |  |  | 208 |
Other(2) | X |  |  |  | 464 |  |  | 418 |
Total Natural Gas and NGL Services |  |  |  |  | 3,145 |  |  | 2,936 |
Total |  |  |  |  | $ | 4,751 |  |  | $ | 4,531 |
(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) Some investments included within Other have also been deemed to be VIEs. (3) On March 31, 2025, MPLX contributed a 100 percent owned subsidiary with a fair value of $125 million to MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C. MPLX received a special distribution of $21 million as a result of the transaction, which is reflected as a return of capital on the consolidated statement of cash flows. (4) MPLX also holds a 39 percent indirect interest in OGC 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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