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Commitments and Contingencies (Details 2) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Minimum
Jun. 30, 2012
Maximum
Environmental        
Estimated environmental reserve $ 134 $ 74    
Reserve for environmental liabilities, short-term 56 12    
Reserve for environmental liabilities, long-term 78 62    
Probable recoveries from insurers and third parties recorded as a receivable $ 57 $ 47    
Actual cash expenditures for environmental liabilities, period paid     3 years 5 years