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Equity Method Investments (Tables) | 3 Months Ended
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Mar. 31, 2018
Schedule of Equity Method Investments [Line Items] |
Equity Method Investments [Table Text Block] | 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 Equity Method Investees Table [Table Text Block] | 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.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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