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Derivative Instruments and Hedging Activities - Pre-Tax Gain (Loss) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivative [Line Items]    
Total gain $ 5 $ 1
Exchange Contracts [Member]
   
Derivative [Line Items]    
Total gain 7 (5)
Forward Contracts [Member]
   
Derivative [Line Items]    
Total gain 2 (1)
Metals Contracts [Member]
   
Derivative [Line Items]    
Total gain $ (4) $ 7