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Commitments and Contingencies (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Roll forward of accrued environmental liabilities  
Environmental liability- December 31 $ 102
Accruals added during the period 0
Change in estimates for pre-existing accruals 2
Payments (3)
Environmental liability- March 31 $ 101