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Investments and Noncontrolling Interests (Narrative) (Details) bbl / d in Thousands, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2017 USD ($) bbl / d | Jun. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Feb. 28, 2013 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total segment revenues and other income(1) |  |  |  | $ 99 | $ 92 | $ 86 |
Contribution - fixed assets to joint venture | [1] |  |  | 0 | 337 | 0 |
Current assets |  |  |  | 897 | 559 |  |
Current liabilities |  |  |  | 1,186 | 1,304 |  |
Contribution - common units issued | [2] |  |  | 4,236 | 1,133 | 669 |
Distributions from unconsolidated affiliates - return of capital |  |  |  | $ 16 | 26 | 0 |
MarkWest Utica EMG |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
NCI owners total funding commitment |  |  |  |  |  |  | $ 950
Percentage of capital required by reporting entity after NCI minimum contribution |  |  |  |  |  |  | 100.00%
Aggregate contributions to VIE threshold |  |  |  |  |  |  | $ 2,000
Maximum percentage ownership interest in joint ventures |  |  |  | 70.00% |  |  |
Threshold percentage for noncontrolling owners to make pro rata contributions |  |  |  | 30.00% |  |  |
Maximum noncontrolling percentage of capital contributions until pro rata ownership threshhold is reached |  |  |  | 10.00% |  |  |
Noncontrolling interest owners actual contribution |  |  |  | $ 1,200 |  |  |
Contribution by the partnership |  |  |  | 1,500 |  |  |
Noncontrolling interest owners capital contribution preference threshold |  |  |  | 500 |  |  |
Noncontrolling owners accrual of preference amount |  |  |  | $ 0 |  | 16 |
Percentage of aggregate investment balance |  |  |  | 56.00% |  |  |
Total segment revenues and other income(1) |  |  |  | $ 17 | 17 | 16 |
Equity method investment, ownership percentage |  |  |  | 56.00% |  |  |
Ohio Gathering |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total segment revenues and other income(1) |  |  |  | $ 16 | 16 | $ 15 |
Equity method investment, ownership percentage |  |  |  | 34.00% |  |  |
Sherwood Midstream LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total segment revenues and other income(1) |  |  |  | $ 12 | 8 |  |
Equity method investment, ownership percentage |  |  |  | 50.00% |  |  |
Contribution - fixed assets to joint venture |  | $ 134 |  |  |  |  |
Payments to acquire interest in joint venture |  | 20 |  |  |  |  |
Sherwood Midstream LLC | Antero Midstream Partners L.P. |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Payments to acquire interest in joint venture |  | $ 154 |  |  |  |  |
MarkWest Ohio Fractionation Company, L.L.C. [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Capacity | bbl / d |  | 20 |  |  |  |  |
Current assets |  |  |  | $ 132 |  |  |
Noncurrent assets |  |  |  | 550 |  |  |
Current liabilities |  |  |  | 75 |  |  |
Liabilities, Noncurrent |  |  |  | 1 |  |  |
MarkWest Ohio Fractionation Company, L.L.C. [Member] | Sherwood Midstream LLC |  |  |  |  |  |  |
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] |  |  |  |  |  |  |
Proceeds From Sale Of Ownership Interest In Assets Sold By Company In Affiliate |  |  |  | $ 15 |  |  |
Equity method investment, ownership percentage |  |  |  | 80.00% |  |  |
Contribution - fixed assets to joint venture |  | 203 |  |  |  |  |
Contribution - common units issued |  | 209 | $ 10 |  |  |  |
Basis difference |  |  |  | $ 14 |  |  |
Gain (loss) on disposition of assets |  | 2 |  |  |  |  |
Distributions from unconsolidated affiliates - return of capital |  | $ 45 |  |  |  |  |
Ownership Interest In Assets Sold By Company In Affiliate |  |  |  | 6.00% |  |  |
Sherwood Midstream Holdings | Sherwood Midstream LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 21.00% |  |  |  |  |
Payments to acquire interest in joint venture |  | $ 44 | $ 4 |  |  |  |
Sherwood Midstream Holdings | Direct Ownership Interest |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 79.00% |  | 60.00% |  |  |
Sherwood Midstream Holdings | Indirect Ownership Interest |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 20.20% |  |  |
Gathering and Processing [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Basis difference |  |  |  | $ 1,000 | 1,000 |  |
Basis difference, not amortized |  |  |  | 459 |  |  |
Logistics and Storage [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Basis difference |  |  |  | 114 | $ 118 |  |
Basis difference, not amortized |  |  |  | $ 39 |  |  |
[1] | Contribution of assets to Sherwood Midstream and Sherwood Midstream Holdings. See Note 5.
[2] | For 2016, includes limited partner units issued to MPC as consideration in the acquisition of HSM. For 2017, includes limited and general partner units issued to MPC as consideration in the acquisitions of the joint-interests, HST, WHC and MPLXT. For 2018, includes limited and general partner units issued to MPC as consideration in the acquisition of Refining Logistics and Fuels Distribution. See Note 4.

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