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Derivative Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Derivatives, Fair Value      
Total asset derivatives $ 2 $ 4 $ 3
Total liability derivatives 10 10 8
Derivatives designated as hedging instruments | Commodity futures contracts | Other liabilities (current)
     
Derivatives, Fair Value      
Total liability derivatives 1 1 3
Derivatives not designated as hedging instruments | Foreign exchange contracts | Receivables
     
Derivatives, Fair Value      
Total asset derivatives 2 4 2
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 liability derivatives $ 9 $ 9 $ 5