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Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$ 157		$ 160
Net income taxes paid to (refunded from) taxing authorities	4		(128)
Non-cash investing and financing activities:
Contribution of assets to joint venture	$ 328	[1]	$ 0
[1] MarkWest’s contribution of assets to Sherwood Midstream and Sherwood Midstream Holdings. See Note 4.

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Value of property contributed in noncash investing and financing activities.

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