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Investments & NCI Sherwood Midstream (Details) bbl / d in Thousands, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2017 USD ($) bbl / d | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Contribution of fixed assets to joint venture | [1] |  |  |  | $ 337 | $ 0 |
Assets, Current |  |  | $ 843 |  | 843 |  | $ 868
Liabilities, Current |  |  | 790 |  | 790 |  | 763
Equity method investments |  |  | 3,368 |  | 3,368 |  | $ 2,471
Operational service revenue |  |  | $ 25 | $ 24 | $ 47 | $ 45 |
Sherwood Midstream LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |  | 50.00% |  |
Contribution of fixed assets to joint venture |  | $ 134 |  |  |  |  |
Payments to Acquire Interest in Joint Venture |  | $ 20 |  |  |  |  |
Equity method investments |  |  | $ 192 |  | $ 192 |  |
Operational service revenue |  |  | 3 |  | 4 |  |
MarkWest Ohio Fractionation Company, L.L.C. [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Capacity | bbl / d |  | 20 |  |  |  |  |
Assets, Current |  |  | 13 |  | 13 |  |
Assets, Noncurrent |  |  | 389 |  | 389 |  |
Liabilities, Current |  |  | $ 377 |  | $ 377 |  |
Sherwood Midstream LLC [Member] | MarkWest Ohio Fractionation Company, L.L.C. [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Payments to Acquire Interest in Joint Venture |  | $ 126 |  |  |  |  |
Antero Midstream Partners L.P. [Member] | Sherwood Midstream LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Payments to Acquire Interest in Joint Venture |  | $ 154 |  |  |  |  |
[1] | Contribution of assets to Sherwood Midstream and Sherwood Midstream Holdings. See Note 4.

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