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Equity Method Investments (Tables) | 6 Months Ended
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Jun. 30, 2017
Equity Method Investments and Joint Ventures [Abstract] |
Summarized Financial Information For Equity Method Investees Table [Text Block] | Summarized financial information for the Partnership’s equity method investments for the six months ended June 30, 2017 and 2016 is as follows:
| Six Months Ended June 30, 2017
(In millions) | MarkWest Utica EMG |  | Other VIEs |  | Non-VIEs |  | Total
Revenues and other income | $ | 88 |  |  | $ | 21 |  |  | $ | 91 |  |  | $ | 200 |
Costs and expenses | 48 |  |  | 17 |  |  | 73 |  |  | 138 |
Income from operations | 40 |  |  | 4 |  |  | 18 |  |  | 62 |
Net income | 40 |  |  | 4 |  |  | 17 |  |  | 61 |
Income (loss) from equity method investments(1) | 2 |  |  | (1 | ) |  | 5 |  |  | 6 |
| Six Months Ended June 30, 2016
(In millions) | MarkWest Utica EMG |  | Other VIEs(2) |  | Non-VIEs |  | Total
Revenues and other income | $ | 113 |  |  | $ | 10 |  |  | $ | 70 |  |  | $ | 193 |
Costs and expenses | 45 |  |  | 104 |  |  | 52 |  |  | 201 |
Income (loss) from operations | 68 |  |  | (94 | ) |  | 18 |  |  | (8 | )
Net income (loss) | 68 |  |  | (94 | ) |  | 18 |  |  | (8 | )
Income (loss) from equity method investments(1) | 7 |  |  | (88 | ) |  | 3 |  |  | (78 | )
(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 six months ended June 30, 2016 related to the Partnership’s investment in Ohio Condensate, which does not appear separately in this table.
Summarized balance sheet information for the Partnership’s equity method investments as of June 30, 2017 and December 31, 2016 is as follows:
| June 30, 2017
(In millions) | MarkWest Utica EMG(1) |  | Other VIEs |  | Non-VIEs |  | Total
Current assets | $ | 72 |  |  | $ | 49 |  |  | $ | 33 |  |  | $ | 154 |
Noncurrent assets | 2,103 |  |  | 881 |  |  | 2,421 |  |  | 5,405 |
Current liabilities | 26 |  |  | 69 |  |  | 18 |  |  | 113 |
Noncurrent liabilities | 2 |  |  | 13 |  |  | — |  |  | 15 |
| December 31, 2016
(In millions) | MarkWest Utica EMG(1) |  | Other VIEs |  | Non-VIEs |  | Total
Current assets | $ | 45 |  |  | $ | 2 |  |  | $ | 40 |  |  | $ | 87 |
Noncurrent assets | 2,173 |  |  | 132 |  |  | 390 |  |  | 2,695 |
Current liabilities | 30 |  |  | 4 |  |  | 26 |  |  | 60 |
Noncurrent liabilities | 2 |  |  | 13 |  |  | — |  |  | 15 |
(1) | MarkWest Utica EMG’s noncurrent assets include its investment in its subsidiary Ohio Gathering, which does not appear elsewhere in this table. The investment was $794 million as of June 30, 2017 and December 31, 2016.

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