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Property, Plant and Equipment, net - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 238 $ 238
Less: accumulated depreciation (124) (119)
Property, plant and equipment, net 114 119
Information Technology Assets [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 48 48
Operating Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 92 93
Buildings and Land [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 98 $ 97
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