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Derivative Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Derivatives, Fair Value      
Total asset derivatives $ 4 $ 4 $ 9
Total liability derivatives 8 10 10
Derivatives designated as hedging instruments | Commodity futures contracts | Receivables
      
Derivatives, Fair Value      
Total asset derivatives 2    
Derivatives designated as hedging instruments | Commodity futures contracts | Other liabilities (current)
      
Derivatives, Fair Value      
Total liability derivatives   1 6
Derivatives not designated as hedging instruments
      
Derivatives, Fair Value      
Total asset derivatives 4 4 9
Derivatives not designated as hedging instruments | Foreign exchange contracts | Receivables
      
Derivatives, Fair Value      
Total asset derivatives 3 4 8
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liabilities (current)
      
Derivatives, Fair Value      
Total asset derivatives 1   1
Total liability derivatives $ 8 $ 9 $ 4