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Derivative Instruments (Details 3) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Derivatives, Fair Value    
Total asset derivatives $ 13 $ 8
Total liability derivatives 10 24
Derivatives designated as hedging instruments | Commodity futures contracts | Other liabilities (current)
    
Derivatives, Fair Value    
Total liability derivatives 6 3
Derivatives not designated as hedging instruments
    
Derivatives, Fair Value    
Total asset derivatives 13 8
Derivatives not designated as hedging instruments | Foreign exchange contracts | Receivables
    
Derivatives, Fair Value    
Total asset derivatives 13 5
Derivatives not designated as hedging instruments | Foreign exchange contracts | Deposits, receivables, and other assets
    
Derivatives, Fair Value    
Total asset derivatives   2
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other liabilities (current)
    
Derivatives, Fair Value    
Total asset derivatives   1
Total liability derivatives $ 4 $ 21