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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) | $ 103 | $ 49 |
Non-cash investing and financing activities: |  |  |
Net transfers of property, plant and equipment from materials and supplies inventories | 1 | 6 |
Contribution of fixed assets to joint venture | $ 0 | $ 328 | [1]
[1] | Contribution of assets to Sherwood Midstream and Sherwood Midstream Holdings. See Note 5.

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