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Fair Value of Derivative Instruments Presented on Gross Basis (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Current assets $ 4 $ 12
Current liabilities (5) 6
Exchange Contracts
   
Derivatives, Fair Value [Line Items]    
Notional Amount 168 108
Current assets 1 8
Current liabilities 1  
Current liabilities (3)  
Forward Contracts
   
Derivatives, Fair Value [Line Items]    
Notional Amount 84 76
Current assets   1
Current liabilities 1 1
Current liabilities (1) 2
Metal Contracts
   
Derivatives, Fair Value [Line Items]    
Notional Amount 38 67
Current assets 1 2
Current liabilities $ (1) $ 4