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Investments and Noncontrolling Interests (Tables)
 12 Months Ended
Dec. 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 ofCarrying value at
December 31,December 31,
(In millions, except ownership percentages)VIE202520252024
Crude Oil and Products Logistics
Illinois Extension Pipeline Company, L.L.C.35%$208 $218 
LOOP LLC41%313 310 
MarEn Bakken Company LLC(1)
25%502 526 
Other(2)
X558 541 
Total Crude Oil and Products Logistics
1,581 1,595 
Natural Gas and NGL Services
BANGL, LLC(3)
— 281 
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C.(4)
X67%407 329 
MarkWest Utica EMG, L.L.C.X61%890 742 
Ohio Gathering Company L.L.C.(5)
X32%444 470 
Sherwood Midstream LLCX50%475 488 
Texas City Logistics LLCX50%163 — 
WPC Parent, LLC30%273 208 
Other(2)
X565 418 
Total Natural Gas and NGL Services
3,217 2,936 
Total$4,798 $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. The December 31, 2024 Natural Gas and NGL Services value includes $129 million in investments associated with the Rockies, which were divested in the fourth quarter 2025.
(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 and now consolidate BANGL.
(4)    On March 31, 2025, MPLX contributed a wholly-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 $42 million in 2025, which are reflected as a return of capital on the Consolidated Statement of Cash Flows.
(5)    MPLX also holds a 41 percent indirect interest in OGC through our ownership interest in MarkWest Utica EMG, L.L.C.
Investment Company, Nonconsolidated Subsidiary, Summarized Financial Information
Summarized financial information for MPLX’s equity method investments is as follows:
(In millions)202520242023
Income statement data:
Revenues and other income$3,959 $3,594 $3,262 
Costs and expenses1,579 1,535 1,331 
Income from operations2,380 2,059 1,930 
Net income1,854 1,631 1,634 
Balance sheet data:
Current assets1,347 1,570 1,531 
Noncurrent assets 20,199 17,927 13,860 
Current liabilities1,044 746 979 
Noncurrent liabilities 7,011 6,711 4,856