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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.