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Commitments and Contingencies (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Minimum
Dec. 31, 2012
Maximum
Environmental        
Estimated environmental reserve $ 96 $ 74    
Reserve for environmental liabilities, short-term 13 12    
Reserve for environmental liabilities, long-term 83 62    
Probable recoveries from insurers and third parties recorded as a receivable $ 42 $ 47    
Actual cash expenditures for environmental liabilities, period paid     3 years 5 years