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Investments and Noncontrolling Interests
12 Months Ended
Dec. 31, 2023
Equity Method Investments and Joint Ventures [Abstract]  
Investments and Noncontrolling Interests Investments and Noncontrolling Interests
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)VIE202320232022
L&S
Andeavor Logistics Rio Pipeline LLCX67%$171 $177 
Illinois Extension Pipeline Company, L.L.C.35%228 236 
LOOP LLC41%314 287 
MarEn Bakken Company LLC(1)
25%449 475 
Minnesota Pipe Line Company, LLC17%174 178 
Whistler Pipeline LLC38%214 211 
Other(2)
X282 269 
Total L&S1,832 1,833 
G&P
Centrahoma Processing LLC40%114 131 
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C.X67%336 335 
MarkWest Torñado GP, L.L.C.(3)
100%— 306 
MarkWest Utica EMG, L.L.C.X58%676 669 
Rendezvous Gas Services, L.L.C.X78%129 137 
Sherwood Midstream Holdings LLCX51%113 125 
Sherwood Midstream LLCX50%500 512 
Other(2)
X43 47 
Total G&P1,911 2,262 
Total$3,743 $4,095 
(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 referred to as the “Bakken Pipeline system”).
(2)    Some investments included within Other have also been deemed to be VIEs.
(3)    At December 31, 2022, we owned a 60 percent interest in Torñado. On December 15, 2023, we acquired the remaining 40 percent interest. As a result of acquiring the remaining interest, we obtained control of and now consolidate Torñado.

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.

Sherwood Midstream LLC (“Sherwood Midstream”) has been deemed the primary beneficiary of Sherwood Midstream Holdings LLC (“Sherwood Midstream Holdings”) due to its controlling financial interest through its authority to manage the joint venture. As a result, Sherwood Midstream consolidates Sherwood Midstream Holdings. Therefore, MPLX also reports its portion of
Sherwood Midstream Holdings’ net assets as a component of its investment in Sherwood Midstream. As of December 31, 2023, MPLX had a 24.55 percent indirect ownership interest in Sherwood Midstream Holdings through Sherwood Midstream.

MPLX’s maximum exposure to loss as a result of its involvement with equity method investments 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 years ended December 31, 2023, 2022 and 2021. See Note 21 for information on our Guarantees related to indebtedness of equity method investees.

From time to time, changes in the design or nature of the activities of our equity method investments may require us to reconsider our conclusions on the entity’s status as a VIE and/or our status as the primary beneficiary. Such reconsideration could result in a change in the classification of the equity method investment. Summarized financial information for MPLX’s equity method investments for the years ended December 31, 2023, 2022 and 2021 is as follows:
2023
(In millions)VIEsNon-VIEsTotal
Revenues and other income$806 $2,456 $3,262 
Costs and expenses336 995 1,331 
Income from operations470 1,460 1,930 
Net income437 1,197 1,634 
Income from equity method investments$238 $362 $600 
2022
(In millions)VIEsNon-VIEsTotal
Revenues and other income$1,197 $1,456 $2,653 
Costs and expenses603 648 1,251 
Income from operations594 808 1,402 
Net income535 711 1,246 
Income from equity method investments$275 $201 $476 
2021
(In millions)VIEsNon-VIEsTotal
Revenues and other income$820 $1,236 $2,056 
Costs and expenses490 568 1,058 
Income from operations330 668 998 
Net income266 594 860 
Income from equity method investments(1)
$175 $146 $321 

Summarized balance sheet information for MPLX’s equity method investments as of December 31, 2023 and 2022 is as follows:
December 31, 2023
(In millions)VIEsNon-VIEsTotal
Current assets$148 $1,383 $1,531 
Noncurrent assets3,757 10,103 13,860 
Current liabilities80 899 979 
Noncurrent liabilities$559 $4,297 $4,856 
December 31, 2022
(In millions)VIEsNon-VIEsTotal
Current assets$474 $450 $924 
Noncurrent assets7,721 5,225 12,946 
Current liabilities323 181 504 
Noncurrent liabilities$2,546 $876 $3,422 

As of December 31, 2023 and 2022, the underlying net assets of MPLX’s investees in the G&P segment exceeded the carrying value of its equity method investments by approximately $45 million and $51 million, respectively. As of December 31, 2023 and 2022, the carrying value of MPLX’s equity method investments in the L&S segment exceeded the underlying net assets of its investees by $314 million and $320 million, respectively.
At both December 31, 2023 and 2022, the G&P basis difference related to goodwill was $31 million. At both December 31, 2023 and 2022, the L&S basis difference related to goodwill was $167 million.