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Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Net cash provided by operating activities included: |  |  |
Interest paid (net of amounts capitalized) |  | $ 99 | $ 109
Non-cash investing and financing activities: |  |  |
Net transfers of property, plant and equipment from materials and supplies inventories |  | 5 | (4)
Contribution of fixed assets to joint venture | [1] | $ 337 | $ 0
[1] | Contribution of assets to Sherwood Midstream and Sherwood Midstream Holdings. See Note 4.

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