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Business Combination - Schedule of Fair Value of Identifiable Assets and Assumed Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Jul. 28, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Property, plant and equipment     $ 2  
Goodwill $ 123 $ 116 42 $ 76
Technology [Member]        
Business Acquisition [Line Items]        
Intangible assets     6  
In-process R&D [Member]        
Business Acquisition [Line Items]        
Intangible assets     40  
AMS [Member]        
Business Acquisition [Line Items]        
Property, plant and equipment     2  
Goodwill     42  
Total net assets at fair value     90  
Purchase consideration     90  
AMS [Member] | Technology [Member]        
Business Acquisition [Line Items]        
Intangible assets     6  
AMS [Member] | In-process R&D [Member]        
Business Acquisition [Line Items]        
Intangible assets     $ 40