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Property, Plant and Equipment, net - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 236	$ 238
Less: accumulated depreciation	(130)	(119)
Property, plant and equipment, net	106	119	$ 143
Information Technology Assets [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	45	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	$ 99	$ 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

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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