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Acquisitions and Investments - Formation of Gathering and Processing Joint Venture (Details) bbl / d in Thousands, $ in Millions |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2017 USD ($) bbl / d | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Contribution of assets to joint venture |  | $ 328 | [1] | $ 0
MPLX LP |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gain on disposal of assets | $ 2 |  |  |
Sherwood Midstream |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments, ownership percentage |  | 50.00% |  |
Sherwood Midstream | MPLX LP |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Contribution of assets to joint venture | 134 |  |  |
Payments to acquire interest in joint venture | 20 |  |  |
Sherwood Midstream | Antero Midstream Partners L.P. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire interest in joint venture | $ 154 |  |  |
Ohio Fractionation |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capacity | bbl / d | 20 |  |  |
Ohio Fractionation | Sherwood Midstream |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to acquire interest in joint venture | $ 126 |  |  |
Sherwood Midstream Holdings |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments, ownership percentage |  | 90.00% |  |
Sherwood Midstream Holdings | Direct Ownership Interest |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments, ownership percentage |  | 79.00% |  |
Sherwood Midstream Holdings | Indirect Ownership Interest |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments, ownership percentage |  | 10.50% |  |
Sherwood Midstream Holdings | MPLX LP |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Contribution of assets to joint venture | 194 |  |  |
Fair value of assets contributed | $ 209 |  |  |
Sherwood Midstream Holdings | Sherwood Midstream |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments, ownership percentage | 21.00% |  |  |
Payments to acquire interest in joint venture | $ 44 |  |  |
[1] | MarkWest’s contribution of assets to Sherwood Midstream and Sherwood Midstream Holdings. See Note 4.

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