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Investments and Noncontrolling Interests (Tables) | 12 Months Ended
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Dec. 31, 2018
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
| December 31, |  | December 31,
(In millions, except ownership percentages) | 2018 |  | 2018 |  | 2017
Explorer | 25% |  | 90 |  |  | 89 |
Illinois Extension Pipeline | 35% |  | 275 |  |  | 284 |
LOCAP | 59% |  | 27 |  |  | 24 |
LOOP | 41% |  | 226 |  |  | 225 |
MarEn Bakken | 25% |  | 498 |  |  | 520 |
Centrahoma Processing LLC | 40% |  | 160 |  |  | 121 |
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C. | 67% |  | 236 |  |  | 164 |
MarkWest Utica EMG, L.L.C. | 56% |  | 2,039 |  |  | 2,139 |
Sherwood Midstream LLC | 50% |  | 366 |  |  | 236 |
Sherwood Midstream Holdings LLC | 60% |  | 157 |  |  | 165 |
Other |  |  | 100 |  |  | 43 |
Total |  |  | $ | 4,174 |  |  | $ | 4,010 |
Summarized Financial Information For Equity Method Investees Table | Summarized financial information for MPLX’s equity method investments for the years ended December 31, 2018, 2017 and 2016 is as follows:
| December 31, 2018
(In millions) | MarkWest Utica EMG, L.L.C. |  | Other VIEs |  | Non-VIEs |  | Total
Revenues and other income | $ | 238 |  |  | $ | 234 |  |  | $ | 1,364 |  |  | $ | 1,836 |
Costs and expenses | 184 |  |  | 95 |  |  | 709 |  |  | 988 |
Income from operations | 54 |  |  | 139 |  |  | 655 |  |  | 848 |
Net income | 53 |  |  | 139 |  |  | 584 |  |  | 776 |
(Loss)/income from equity method investments(1) | $ | (10 | ) |  | $ | 74 |  |  | $ | 176 |  |  | $ | 240 |
| December 31, 2017
(In millions) | MarkWest Utica EMG, L.L.C. |  | Other VIEs |  | Non-VIEs |  | Total
Revenues and other income | $ | 187 |  |  | $ | 86 |  |  | $ | 954 |  |  | $ | 1,227 |
Costs and expenses | 97 |  |  | 42 |  |  | 520 |  |  | 659 |
Income from operations | 90 |  |  | 44 |  |  | 434 |  |  | 568 |
Net income | 90 |  |  | 43 |  |  | 345 |  |  | 478 |
Income from equity method investments(1) | $ | 10 |  |  | $ | 20 |  |  | $ | 48 |  |  | $ | 78 |
| December 31, 2016
(In millions) | MarkWest Utica EMG, L.L.C. |  | Other VIEs(2) |  | Non-VIEs |  | Total
Revenues and other income | $ | 216 |  |  | $ | 18 |  |  | $ | 148 |  |  | $ | 382 |
Costs and expenses | 100 |  |  | 111 |  |  | 117 |  |  | 328 |
Income/(loss) from operations | 116 |  |  | (93 | ) |  | 31 |  |  | 54 |
Net income/(loss) | 114 |  |  | (93 | ) |  | 31 |  |  | 52 |
Income/(loss) from equity method investments(1) | $ | 8 |  |  | $ | (89 | ) |  | $ | 7 |  |  | $ | (74 | )
(1) | “Income/(loss) from equity method investments” includes the impact of any basis differential amortization or accretion.
(2) | Includes an impairment charge of $89 million for the year ended December 31, 2016 related to MPLX’s investment in Ohio Condensate Company, L.L.C., which does not appear separately in this table.
Summarized balance sheet information for MPLX’s equity method investments as of December 31, 2018 and 2017 is as follows:
| December 31, 2018
(In millions) | MarkWest Utica EMG, L.L.C. (1) |  | Other VIEs |  | Non-VIEs |  | Total
Current assets | $ | 82 |  |  | $ | 153 |  |  | $ | 379 |  |  | $ | 614 |
Noncurrent assets | 1,939 |  |  | 1,596 |  |  | 4,715 |  |  | 8,250 |
Current liabilities | 28 |  |  | 127 |  |  | 246 |  |  | 401 |
Noncurrent liabilities | $ | 3 |  |  | $ | 186 |  |  | $ | 841 |  |  | $ | 1,030 |
| 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 (“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 $750 million and $790 million as of December 31, 2018 and 2017, respectively.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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