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Derivative Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value    
Total asset derivatives $ 4 $ 4
Total liability derivatives 7 10
Derivatives designated as hedging instruments | Commodity futures contracts | Receivables
    
Derivatives, Fair Value    
Total asset derivatives 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 | Foreign exchange contracts | Receivables
    
Derivatives, Fair Value    
Total asset derivatives 3 4
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liabilities (current)
    
Derivatives, Fair Value    
Total liability derivatives $ 7 $ 9