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Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Net cash provided by operating activities included: |  |  |
Interest paid (net of amounts capitalized) | $ 212 | $ 157 |
Net income taxes paid to taxing authorities | 6 | 4 |
Non-cash investing and financing activities: |  |  |
Contribution of assets to joint venture | $ 0 | $ 328 | [1]
[1] | MarkWest’s contribution of assets to Sherwood Midstream and Sherwood Midstream Holdings. See Note 5.

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