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Investments and Noncontrolling Interests
 9 Months Ended
Sep. 30, 2025
Equity Method Investments and Joint Ventures [Abstract]  
Investments and Noncontrolling Interests Equity Method Investments
The following table presents MPLX’s equity method investments at the dates indicated:
Ownership as ofCarrying value at
September 30,September 30,December 31,
(In millions, except ownership percentages)VIE202520252024
Crude Oil and Products Logistics
Illinois Extension Pipeline Company, L.L.C.35%$219 $218 
LOOP LLC41%314 310 
MarEn Bakken Company LLC(1)
25%508 526 
Other(2)
X551 541 
Total Crude Oil and Products Logistics
1,592 1,595 
Natural Gas and NGL Services
BANGL, LLC(3)
100%— 281 
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C.(4)
X67%410 329 
MarkWest Utica EMG, L.L.C.X60%836 742 
Ohio Gathering Company L.L.C.(5)
X33%451 470 
Sherwood Midstream LLCX50%479 488 
WPC Parent, LLC30%389 208 
Other(2)
X758 418 
Total Natural Gas and NGL Services
3,323 2,936 
Total$4,915 $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)    Included within Other are certain equity method investments that have been deemed to be VIEs, as well as $123 million in investments classified as held for sale as part of the Rockies operations divestiture discussed in Note 3.
(3)    At December 31, 2024, we owned a 45 percent interest in BANGL. On July 1, 2025, we acquired the remaining 55 percent interest in BANGL. As a result of acquiring the remaining interest, we obtained control of and now consolidate BANGL.
(4)    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. As a result of the transaction, MPLX received special distributions of $21 million in the first quarter of 2025 and $21 million in the third quarter of 2025, which are reflected as a return of capital on the Consolidated Statement of Cash Flows.
(5)    MPLX also holds a 40 percent indirect interest in OGC through our ownership interest in MarkWest Utica EMG, L.L.C.
For those entities that have been deemed to be VIEs, neither MPLX nor any of its subsidiaries have been deemed to be the primary beneficiary due to voting rights on significant matters. While we have the ability to exercise influence through participation in the management committees, which make all significant decisions, we have equal influence over each committee as a joint interest partner and all significant decisions require the consent of the other investors without regard to economic interest. As such, we have determined that these entities should not be consolidated and applied the equity method of accounting with respect to our investments in each entity.
MPLX’s maximum exposure to loss as a result of its involvement with equity method investments generally includes its equity investment, any additional capital contribution commitments and any operating expenses incurred by the subsidiary operator in excess of its compensation received for the performance of the operating services. MPLX did not provide any financial support to equity method investments that it was not contractually obligated to provide during the nine months ended September 30, 2025 and September 30, 2024. See Note 16 for information on our guarantees related to equity method investees.