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Equity Method Investments - Summary of Equity Method Investment Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Sep. 01, 2017 | Jan. 01, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenues and other income |  | $ 403 | $ 103 |  |  |
Costs and expenses |  | 217 | 66 |  |  |
Income (loss) from operations |  | 186 | 37 |  |  |
Net income (loss) |  | 173 | 33 |  |  |
Income from equity method investments | [1] | 61 | 5 |  |  |
Current assets |  | 505 |  | $ 510 |  |
Noncurrent assets |  | 7,733 |  | 7,631 |  |
Current liabilities |  | 294 |  | 303 |  |
Noncurrent liabilities |  | 885 |  | 918 |  |
Difference between carrying amount and underlying equity |  | 1,000 |  | 1,000 |  |
Difference between carrying amount and underlying equity portion related to goodwill |  | 459 |  | 459 |  |
Equity method investments |  | $ 4,033 |  | 4,010 |  |
Centrahoma Processing LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 40.00% |  |  |  |
Equity method investments |  | $ 121 |  | 121 |  |
MarkWest Utica EMG |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 56.00% |  |  |  |
Revenues and other income |  | $ 63 | 50 |  |  |
Costs and expenses |  | 44 | 25 |  |  |
Income (loss) from operations |  | 19 | 25 |  |  |
Net income (loss) |  | 19 | 25 |  |  |
Income from equity method investments | [1] | 1 | 4 |  |  |
Current assets |  | 71 |  | 65 |  |
Noncurrent assets | [2] | 2,035 |  | 2,077 |  |
Current liabilities |  | 24 |  | 39 |  |
Noncurrent liabilities |  | 4 |  | 3 |  |
Equity method investments |  | 2,116 |  | 2,139 |  |
Other VIEs [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenues and other income |  | 43 | 8 |  |  |
Costs and expenses |  | 18 | 8 |  |  |
Income (loss) from operations |  | 25 | 0 |  |  |
Net income (loss) |  | 25 | 0 |  |  |
Income from equity method investments | [1] | 14 | (1) |  |  |
Current assets |  | 71 |  | 46 |  |
Noncurrent assets |  | 1,002 |  | 930 |  |
Current liabilities |  | 87 |  | 44 |  |
Noncurrent liabilities |  | 11 |  | 11 |  |
Equity method investments |  | 8 |  | 8 |  |
Non-VIEs [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenues and other income |  | 297 | 45 |  |  |
Costs and expenses |  | 155 | 33 |  |  |
Income (loss) from operations |  | 142 | 12 |  |  |
Net income (loss) |  | 129 | 8 |  |  |
Income from equity method investments | [1] | 46 | $ 2 |  |  |
Current assets |  | 363 |  | 399 |  |
Noncurrent assets |  | 4,696 |  | 4,624 |  |
Current liabilities |  | 183 |  | 220 |  |
Noncurrent liabilities |  | $ 870 |  | 904 |  |
Ohio Condensate Company, LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 60.00% |  |  |  |
Equity method investments |  | $ 11 |  | 11 |  |
Ohio Gathering |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 34.00% |  |  |  |
Investment in subsidiary |  | $ 784 |  | 790 |  |
Explorer |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 25.00% |  |  | 25.00% |
Equity method investments |  | $ 97 |  | 89 |  |
Illinois Extension |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 35.00% |  |  | 35.00% |
Equity method investments |  | $ 288 |  | 284 |  |
LOCAP |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 59.00% |  |  | 59.00% |
Equity method investments |  | $ 26 |  | 24 |  |
LOOP |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 41.00% |  |  | 41.00% |
Equity method investments |  | $ 225 |  | 225 |  |
MarEn Bakken Company LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 25.00% |  |  |  |
Equity method investments |  | $ 529 |  | 520 |  |
Jefferson Dry Gas |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 67.00% |  |  |  |
Equity method investments |  | $ 178 |  | 164 |  |
Panola Pipeline Company LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 15.00% |  |  |  |
Equity method investments |  | $ 23 |  | 24 |  |
Sherwood Midstream |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 50.00% |  |  |  |
Equity method investments |  | $ 260 |  | 236 |  |
Sherwood Midstream Holdings |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 81.00% |  |  |  |
Equity method investments |  | $ 151 |  | $ 165 |  |
Direct Ownership Interest [Member] | Sherwood Midstream Holdings |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 62.00% |  |  |  | 79.00%
[1] | “Income (loss) from equity method investments” includes the impact of any basis differential amortization or accretion.
[2] | 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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