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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.