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Equity Method Investments - Summary of Equity Method Investment Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Revenues and other income |  |  |  | $ 200 |  | $ 193 |  |
Costs and expenses |  |  |  | 138 |  | 201 |  |
Income from operations |  |  |  | 62 |  | (8) |  |
Net income (loss) |  |  |  | 61 |  | (8) |  |
Income (loss) from equity method investments |  | $ 1 | $ (83) | 6 | [1] | (78) | [1] |
Current assets |  | 154 |  | 154 |  |  |  | $ 87
Noncurrent assets |  | 5,405 |  | 5,405 |  |  |  | 2,695
Current liabilities |  | 113 |  | 113 |  |  |  | 60
Noncurrent liabilities |  | 15 |  | 15 |  |  |  | 15
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  | 1,100 |  | 1,100 |  |  |  | 1,100
MarkWest Utica EMG [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Revenues and other income |  |  |  | 88 |  | 113 |  |
Costs and expenses |  |  |  | 48 |  | 45 |  |
Income from operations |  |  |  | 40 |  | 68 |  |
Net income (loss) |  |  |  | 40 |  | 68 |  |
Income (loss) from equity method investments | [1] |  |  | 2 |  | 7 |  |
Current assets |  | 72 |  | 72 |  |  |  | 45
Noncurrent assets | [2] | 2,103 |  | 2,103 |  |  |  | 2,173
Current liabilities |  | 26 |  | 26 |  |  |  | 30
Noncurrent liabilities |  | 2 |  | 2 |  |  |  | 2
Equity Method Investment Difference Between Carrying Amount And Underlying Equity Portion Related To Goodwill Not Amortized |  | 459 |  | 459 |  |  |  |
Other VIEs [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Revenues and other income |  |  |  | 21 |  | 10 |  |
Costs and expenses |  |  |  | 17 |  | 104 | [3] |
Income from operations |  |  |  | 4 |  | (94) |  |
Net income (loss) |  |  |  | 4 |  | (94) |  |
Income (loss) from equity method investments | [1] |  |  | (1) |  | (88) |  |
Current assets |  | 49 |  | 49 |  |  |  | 2
Noncurrent assets |  | 881 |  | 881 |  |  |  | 132
Current liabilities |  | 69 |  | 69 |  |  |  | 4
Noncurrent liabilities |  | 13 |  | 13 |  |  |  | 13
Non-VIEs [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Revenues and other income |  |  |  | 91 |  | 70 |  |
Costs and expenses |  |  |  | 73 |  | 52 |  |
Income from operations |  |  |  | 18 |  | 18 |  |
Net income (loss) |  |  |  | 17 |  | 18 |  |
Income (loss) from equity method investments | [1] |  |  | 5 |  | 3 |  |
Current assets |  | 33 |  | 33 |  |  |  | 40
Noncurrent assets |  | 2,421 |  | 2,421 |  |  |  | 390
Current liabilities |  | 18 |  | 18 |  |  |  | 26
Noncurrent liabilities |  | 0 |  | 0 |  |  |  | 0
Ohio Condensate Company, LLC [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Impairment related to equity method investment from asset impairment and elimination of basis differential |  |  |  |  |  | $ 89 |  |
Ohio Gathering Company, LLC [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investments in subsidiary |  | $ 794 |  | $ 794 |  |  |  | $ 794
[1] | Income (loss) from equity method investments includes the impact of any basis differential amortization or accretion.
[2] | 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.
[3] | 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.

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition Amount of income (loss) from continuing operations reported by an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33912-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition The amount of net income (loss) reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33912-111571 + Details
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