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Related Party Transactions - Payables To Related Parties (Detail) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Related Party Transaction [Line Items] |  |
Payables to related parties | $ 53 | $ 53
Illinois Extension Pipeline |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 8 | 9
LOCAP |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 2 | 2
LOOP |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 5 | 6
MarkWest Utica EMG |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 28 | 24
Ohio Condensate |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 2 | 1
Sherwood Midstream Holdings |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 3 | 0
TAAE |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 2 | 2
TACE |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 2 | 4
TAME |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | 1 | 4
Other equity method investees |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | $ 0 | $ 1

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