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Derivative Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Derivatives, Fair Value      
Total asset derivatives $ 4 $ 13 $ 22
Total liability derivatives 5 10 12
Derivatives designated as hedging instruments | Commodity futures contracts | Other liabilities (current)
     
Derivatives, Fair Value      
Total asset derivatives 1    
Total liability derivatives 1 6 4
Derivatives not designated as hedging instruments
     
Derivatives, Fair Value      
Total asset derivatives 3 13 22
Total liability derivatives 4 4 8
Derivatives not designated as hedging instruments | Foreign exchange contracts | Receivables
     
Derivatives, Fair Value      
Total asset derivatives 2 13 19
Derivatives not designated as hedging instruments | Foreign exchange contracts | Deposits, receivables, and other assets
     
Derivatives, Fair Value      
Total asset derivatives 1    
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liabilities (current)
     
Derivatives, Fair Value      
Total asset derivatives     3
Total liability derivatives $ 4 $ 4 $ 8