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Related Party Transactions - Other Income From Related Parties (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Related Party Transaction [Line Items] |  |
Other income from related parties | $ 13 | $ 11
MarkWest Utica EMG |  |
Related Party Transaction [Line Items] |  |
Other income from related parties | 4 | 4
Ohio Gathering |  |
Related Party Transaction [Line Items] |  |
Other income from related parties | 4 | 4
Sherwood Midstream |  |
Related Party Transaction [Line Items] |  |
Other income from related parties | 3 | 1
Other equity method investees |  |
Related Party Transaction [Line Items] |  |
Other income from related parties | $ 2 | $ 2

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. + References No definition available. + Details
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- Details
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- Details
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