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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Depreciation expense for the year $ 676 $ 632 $ 501
Impairment charge during the year on property, plant and equipment $ 500 $ 544 $ 157