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Derivative Instruments - Balance Sheet Classification (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Derivatives, Fair Value      
Total asset derivatives $ 16 $ 10 $ 10
Total liability derivatives 6 4 6
Derivatives designated as hedging instruments | Commodity forward contracts | Other liabilities (current)      
Derivatives, Fair Value      
Total liability derivatives 2    
Derivatives not designated as hedging instruments | Foreign exchange derivative contracts | Receivables.      
Derivatives, Fair Value      
Total asset derivatives 16 10 10
Derivatives not designated as hedging instruments | Foreign exchange derivative contracts | Other liabilities (current)      
Derivatives, Fair Value      
Total liability derivatives $ 4 $ 4 $ 6