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Property, Plant and Equipment, net - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 245 $ 236
Less: accumulated depreciation (135) (130)
Property, plant and equipment, net 110 106
Information Technology Assets [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 45 45
Operating Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 100 92
Buildings and Land [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 99 $ 99
Construction in Progress [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 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