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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Information Technology Equipment [Member]
Dec. 31, 2013
Information Technology Equipment [Member]
Mar. 31, 2014
Operating Equipment [Member]
Dec. 31, 2013
Operating Equipment [Member]
Mar. 31, 2014
Land and Buildings [Member]
Dec. 31, 2013
Land and Buildings [Member]
Mar. 31, 2014
Minimum [Member]
Information Technology Equipment [Member]
Mar. 31, 2014
Minimum [Member]
Operating Equipment [Member]
Mar. 31, 2014
Minimum [Member]
Land and Buildings [Member]
Dec. 31, 2013
Maximum [Member]
Information Technology Equipment [Member]
Dec. 31, 2013
Maximum [Member]
Operating Equipment [Member]
Dec. 31, 2013
Maximum [Member]
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]                            
Property, plant and equipment, Gross $ 165 $ 163 $ 48 $ 44 $ 57 $ 57 $ 60 $ 62            
Less: accumulated depreciation (61) (61)                        
Property, plant and equipment, net $ 104 $ 102                        
Property, plant and equipment, estimated useful lives                 1 year 3 years 5 years 7 years 15 years 35 years