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Commitments And Contingencies (Environmental Litigation) (Details) (USD $)
In Millions
9 Months Ended6 Months Ended
Sep. 30, 2011
Jun. 30, 2011
ACE [Member]
EPA costs to date to clean up site$ 6 
Estimated costs remaining to remediate the site6 
Costs for performing the RI/FS1 
Projected Remediation Costs13 
Accrued costs14 
Settlement agreement payment $ 1