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Commitments and Contingencies (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Environmental    
Estimated environmental reserve $ 74 $ 74
Reserve for environmental liabilities, short-term 10 12
Reserve for environmental liabilities, long-term 64 62
Probable recoveries from insurers and third parties recorded as a receivable $ 15 $ 47
Actual cash expenditures for environmental liabilities, period paid, low end of range (in years) 3 years  
Actual cash expenditures for environmental liabilities, period paid, high end of range (in years) 5 years