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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, Gross 175us-gaap_PropertyPlantAndEquipmentGross $ 163us-gaap_PropertyPlantAndEquipmentGross  
Less: accumulated depreciation (51)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (61)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Net property, plant and equipment 124us-gaap_PropertyPlantAndEquipmentNet 102us-gaap_PropertyPlantAndEquipmentNet 61us-gaap_PropertyPlantAndEquipmentNet
Information Technology Assets [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, Gross 49us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TechnologyEquipmentMember
27us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_TechnologyEquipmentMember
 
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 51us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
57us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
 
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 73us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
60us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
 
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 2us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 19us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember