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Equity Method Investments | 3 Months Ended
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Mar. 31, 2018
Equity Method Investments and Joint Ventures [Abstract] |
Investments and Noncontrolling Interests [Text Block] | Investments and Noncontrolling Interests The following table presents the Partnership’s equity method investments at the dates indicated:
| Ownership as of |  | Carrying value at
| March 31, |  | March 31, |  | December 31,
(In millions) | 2018 |  | 2018 |  | 2017
Centrahoma Processing LLC | 40% |  | $ | 121 |  |  | $ | 121 |
Explorer | 25% |  | 97 |  |  | 89 |
Illinois Extension | 35% |  | 288 |  |  | 284 |
LOCAP | 59% |  | 26 |  |  | 24 |
LOOP | 41% |  | 225 |  |  | 225 |
MarEn Bakken | 25% |  | 529 |  |  | 520 |
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C. | 67% |  | 178 |  |  | 164 |
MarkWest Utica EMG, L.L.C. | 56% |  | 2,116 |  |  | 2,139 |
Ohio Condensate Company, L.L.C. | 60% |  | 11 |  |  | 11 |
Panola Pipeline Company, LLC | 15% |  | 23 |  |  | 24 |
Sherwood Midstream LLC | 50% |  | 260 |  |  | 236 |
Sherwood Midstream Holdings LLC | 62% |  | 151 |  |  | 165 |
Other |  |  | 8 |  |  | 8 |
Total |  |  | $ | 4,033 |  |  | $ | 4,010 |
Summarized financial information for the Partnership’s equity method investments for the three months ended March 31, 2018 and 2017 is as follows:
| Three Months Ended March 31, 2018
(In millions) | MarkWest Utica EMG, L.L.C. |  | Other VIEs |  | Non-VIEs |  | Total
Revenues and other income | $ | 63 |  |  | $ | 43 |  |  | $ | 297 |  |  | $ | 403 |
Costs and expenses | 44 |  |  | 18 |  |  | 155 |  |  | 217 |
Income from operations | 19 |  |  | 25 |  |  | 142 |  |  | 186 |
Net income | 19 |  |  | 25 |  |  | 129 |  |  | 173 |
Income from equity method investments(1) | 1 |  |  | 14 |  |  | 46 |  |  | 61 |
| Three Months Ended March 31, 2017
(In millions) | MarkWest Utica EMG, L.L.C. |  | Other VIEs |  | Non-VIEs |  | Total
Revenues and other income | $ | 50 |  |  | $ | 8 |  |  | $ | 45 |  |  | $ | 103 |
Costs and expenses | 25 |  |  | 8 |  |  | 33 |  |  | 66 |
Income from operations | 25 |  |  | — |  |  | 12 |  |  | 37 |
Net income | 25 |  |  | — |  |  | 8 |  |  | 33 |
Income (loss) from equity method investments(1) | 4 |  |  | (1 | ) |  | 2 |  |  | 5 |
(1) | “Income (loss) from equity method investments” includes the impact of any basis differential amortization or accretion.
Summarized balance sheet information for the Partnership’s equity method investments as of March 31, 2018 and December 31, 2017 is as follows:
| March 31, 2018
(In millions) | MarkWest Utica EMG, L.L.C.(1) |  | Other VIEs |  | Non-VIEs |  | Total
Current assets | $ | 71 |  |  | $ | 71 |  |  | $ | 363 |  |  | $ | 505 |
Noncurrent assets | 2,035 |  |  | 1,002 |  |  | 4,696 |  |  | 7,733 |
Current liabilities | 24 |  |  | 87 |  |  | 183 |  |  | 294 |
Noncurrent liabilities | 4 |  |  | 11 |  |  | 870 |  |  | 885 |
| December 31, 2017
(In millions) | MarkWest Utica EMG, L.L.C.(1) |  | Other VIEs |  | Non-VIEs |  | Total
Current assets | $ | 65 |  |  | $ | 46 |  |  | $ | 399 |  |  | $ | 510 |
Noncurrent assets | 2,077 |  |  | 930 |  |  | 4,624 |  |  | 7,631 |
Current liabilities | 39 |  |  | 44 |  |  | 220 |  |  | 303 |
Noncurrent liabilities | 3 |  |  | 11 |  |  | 904 |  |  | 918 |
(1) | MarkWest Utica EMG, L.L.C.’s (“MarkWest Utica EMG”) noncurrent assets include its investment in its subsidiary, Ohio Gathering Company, L.L.C. (“Ohio Gathering”), which does not appear elsewhere in this table. The investment was $784 million and $790 million as of March 31, 2018 and December 31, 2017, respectively.
As of March 31, 2018 and December 31, 2017, the carrying value of the Partnership’s equity method investments exceeded the underlying net assets of its investees by $1.0 billion. This basis difference is being amortized or accreted into net income over the remaining estimated useful lives of the underlying net assets, except for $459 million of excess related to goodwill. MarkWest Utica EMG Effective January 1, 2012, MarkWest Utica Operating Company, L.L.C. (“Utica Operating”), a wholly-owned and consolidated subsidiary of MarkWest, and EMG Utica, LLC (“EMG Utica” and together with Utica Operating, the “Members”) executed agreements to form a joint venture, MarkWest Utica EMG, to develop significant natural gas gathering, processing and NGL fractionation, transportation and marketing infrastructure in eastern Ohio. MarkWest Utica EMG is deemed to be a VIE. Utica Operating is not deemed to be the primary beneficiary, due to EMG Utica’s voting rights on significant matters. The Partnership’s maximum exposure to loss as a result of its involvement with MarkWest Utica EMG 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. The Partnership did not provide any financial support to MarkWest Utica EMG that it was not contractually obligated to provide during the three months ended March 31, 2018. Ohio Gathering Ohio Gathering is a subsidiary of MarkWest Utica EMG and is engaged in providing natural gas gathering services in the Utica Shale in eastern Ohio. Ohio Gathering is a joint venture between MarkWest Utica EMG and Summit Midstream Partners, LLC. As of March 31, 2018, the Partnership has an approximate 34 percent indirect ownership interest in Ohio Gathering. As Ohio Gathering is a subsidiary of MarkWest Utica EMG, which is accounted for as an equity method investment, the Partnership reports its portion of Ohio Gathering’s net assets as a component of its investment in MarkWest Utica EMG. Sherwood Midstream Effective January 1, 2017, MarkWest Liberty Midstream & Resources, L.L.C. (“MarkWest Liberty Midstream”), a wholly-owned and consolidated subsidiary of MarkWest, and Antero Midstream Partners, LP (“Antero Midstream”) formed a joint venture, Sherwood Midstream LLC (“Sherwood Midstream”), to support Antero Resources Corporation’s development in the Marcellus Shale. Pursuant to the terms of the related limited liability company agreement (the “LLC Agreement”), MarkWest Liberty Midstream contributed assets then under construction with a fair value of approximately $134 million and cash of approximately $20 million. Antero Midstream made an initial capital contribution of approximately $154 million. Also effective January 1, 2017, MarkWest Liberty Midstream converted all of its ownership interests in MarkWest Ohio Fractionation Company, L.L.C. (“Ohio Fractionation”), a previously wholly-owned subsidiary, to Class A Interests and amended its LLC Agreement to create Class B-3 Interests, which were sold to Sherwood Midstream for $126 million in cash. The Class B-3 Interests provide Sherwood Midstream with the right to fractionation revenue and the obligation to pay expenses related to 20 mbpd of capacity in the Hopedale 3 fractionator. Sherwood Midstream accounts for its investment in Ohio Fractionation, which is a VIE, as an equity method investment as Sherwood Midstream does not control Ohio Fractionation. MarkWest Liberty Midstream has been deemed to be the primary beneficiary of Ohio Fractionation because it has control over the decisions that could significantly impact its financial performance, and as a result, consolidates Ohio Fractionation. The creditors of Ohio Fractionation do not have recourse to MPLX LP’s general credit through guarantees or other financial arrangements. The assets of Ohio Fractionation are the property of Ohio Fractionation and cannot be used to satisfy the obligations of MPLX LP. Sherwood Midstream’s interests are reflected in “Net income attributable to noncontrolling interests” in the Consolidated Statements of Income and “Noncontrolling interests” in the Consolidated Balance Sheets. Sherwood Midstream is deemed to be a VIE. MarkWest Liberty Midstream is not deemed to be the primary beneficiary, due to Antero Midstream’s voting rights on significant matters. The Partnership’s maximum exposure to loss as a result of its involvement with Sherwood Midstream 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. The Partnership did not provide any financial support to Sherwood Midstream that it was not contractually obligated to provide during the three months ended March 31, 2018. Sherwood Midstream Holdings Effective January 1, 2017, MarkWest Liberty Midstream and Sherwood Midstream formed a joint venture, Sherwood Midstream Holdings LLC (“Sherwood Midstream Holdings”), for the purpose of owning, operating and maintaining all of the shared assets that support the operations of the gas plants and other assets owned by Sherwood Midstream and the gas plants and deethanization facilities owned by MarkWest Liberty Midstream. MarkWest Liberty Midstream initially contributed certain real property, equipment and facilities with a fair value of approximately $209 million to Sherwood Midstream Holdings in exchange for a 79 percent initial ownership interest. Sherwood Midstream contributed cash of approximately $44 million to Sherwood Midstream Holdings in exchange for a 21 percent ownership interest. During the second quarter ended June 30, 2017, true-ups to the initial contributions were finalized. MarkWest Liberty Midstream contributed certain additional real property, equipment and facilities with a fair value of approximately $10 million to Sherwood Midstream Holdings and Sherwood Midstream contributed cash of approximately $4 million to Sherwood Midstream Holdings. The contribution was determined to be an in-substance sale of real estate. During the three months ended March 31, 2018, MarkWest Liberty Midstream sold to Sherwood Midstream six percent of their equity ownership in Sherwood Midstream Holdings for $15 million. The Partnership accounts for Sherwood Midstream Holdings, which is a VIE, as an equity method investment as Sherwood Midstream is considered to be the general partner and controls all decisions. The Partnership’s maximum exposure to loss as a result of its involvement with Sherwood Midstream Holdings 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. The Partnership did not provide any financial support to Sherwood Midstream Holdings that it was not contractually obligated to provide during the three months ended March 31, 2018. Sherwood Midstream has been deemed the primary beneficiary of 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, the Partnership also reports its portion of Sherwood Midstream Holdings’ net assets as a component of its investment in Sherwood Midstream. As of March 31, 2018, the Partnership has an 18.9 percent indirect ownership interest in Sherwood Midstream Holdings through Sherwood Midstream.

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- Definition The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI http://asc.fasb.org/topic&trid=2196965 + Details
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