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Property, Plant and Equipment, net - Summary of Property, Plant and Equipment (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 181 $ 163
Less: accumulated depreciation (63) (61)
Property, plant and equipment, net 118 102
Information Technology Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 55 44
Operating Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 58 57
Land and Buildings [Member]
   
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 68 $ 62