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Related Party Transactions - Payables To Related Parties (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Related Party Transaction [Line Items] |  |
Payables to related parties | $ 51 | $ 69
Illinois Extension Pipeline |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 7 | 8
LOOP |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 2 | 3
MarkWest Utica EMG |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 20 | 29
Ohio Gathering |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 1 | 9
Sherwood Midstream |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 11 | 8
Other equity method investees |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | $ 10 | $ 12

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