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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Gross $ 226 $ 175
Less: accumulated depreciation (64) (51)
Property, plant and equipment, net 162 124
Information Technology Assets [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Gross $ 51 49
Information Technology Assets [Member] | Minimum [Member]    
Property Plant And Equipment [Line Items]    
Property plant and equipment estimated useful lives 2 years  
Information Technology Assets [Member] | Maximum [Member]    
Property Plant And Equipment [Line Items]    
Property plant and equipment estimated useful lives 7 years  
Operating Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Gross $ 81 51
Operating Equipment [Member] | Minimum [Member]    
Property Plant And Equipment [Line Items]    
Property plant and equipment estimated useful lives 3 years  
Operating Equipment [Member] | Maximum [Member]    
Property Plant And Equipment [Line Items]    
Property plant and equipment estimated useful lives 15 years  
Buildings and Land (Indefinite Life) [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Gross $ 89 73
Buildings and Land (Indefinite Life) [Member] | Minimum [Member]    
Property Plant And Equipment [Line Items]    
Property plant and equipment estimated useful lives 5 years  
Buildings and Land (Indefinite Life) [Member] | Maximum [Member]    
Property Plant And Equipment [Line Items]    
Property plant and equipment estimated useful lives 35 years  
Construction in progress [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, Gross $ 5 $ 2