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Derivative Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Derivatives, Fair Value      
Total asset derivatives $ 4 $ 4 $ 2
Total liability derivatives 2 7 10
Derivatives designated as hedging instruments | Commodity futures contracts | Receivables
      
Derivatives, Fair Value      
Total asset derivatives 1 1  
Derivatives designated as hedging instruments | Commodity futures contracts | Other liabilities (current)
      
Derivatives, Fair Value      
Total liability derivatives     1
Derivatives not designated as hedging instruments | Forward exchange contracts | Other liabilities (current)
      
Derivatives, Fair Value      
Total liability derivatives 2 7 9
Derivatives not designated as hedging instruments | Foreign exchange contracts | Receivables
      
Derivatives, Fair Value      
Total asset derivatives $ 3 $ 3 $ 2