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Related Party Transactions - Other Income From Related Parties (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Related Party Transaction [Line Items]
Other income from related parties	$ 11	$ 8
MarkWest Utica EMG
Related Party Transaction [Line Items]
Other income from related parties	4	2
Ohio Gathering
Related Party Transaction [Line Items]
Other income from related parties	4	4
Other equity method investees
Related Party Transaction [Line Items]
Other income from related parties	$ 3	$ 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.

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No definition available.

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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.

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