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Property, Plant and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Property, Plant and Equipment [Line Items]    
Asset impairment charges $ 77 $ 36
2012-2014 Restructuring Program
   
Property, Plant and Equipment [Line Items]    
Asset impairment charges $ 74 $ 32