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Commitments and Contingencies (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Environmental    
Estimated environmental reserve $ 74 $ 66
Reserve for environmental liabilities, short-term 12 10
Reserve for environmental liabilities, long-term 62 56
Probable recoveries from insurers and third parties recorded as a receivable $ 47 $ 5
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