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Supplemental Financial Information - Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Property, plant and equipment, at cost $ 10,379 $ 10,333
Accumulated depreciation (5,973) (5,803)
Property, plant and equipment, net $ 4,406 $ 4,530