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Property, Plant and Equipment, net - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 240 $ 236
Less: accumulated depreciation (114) (93)
Property, plant and equipment, net 126 143
Information Technology Assets [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 48 47
Operating Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 93 93
Buildings and Land [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 98 95
Construction in progress [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 1 $ 1
Minimum [Member] | Information Technology Assets [Member]    
Property Plant And Equipment [Line Items]    
Property plant and equipment estimated useful lives 1 year  
Minimum [Member] | Operating Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property plant and equipment estimated useful lives 2 years  
Minimum [Member] | Buildings [Member]    
Property Plant And Equipment [Line Items]    
Property plant and equipment estimated useful lives 5 years  
Maximum [Member] | Information Technology Assets [Member]    
Property Plant And Equipment [Line Items]    
Property plant and equipment estimated useful lives 7 years  
Maximum [Member] | Operating Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property plant and equipment estimated useful lives 15 years  
Maximum [Member] | Buildings [Member]    
Property Plant And Equipment [Line Items]    
Property plant and equipment estimated useful lives 35 years