Commitments And Contingencies (Environmental Litigation) (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011
EPA costs to date to clean up site	$ 6
Estimated costs remaining to remediate the site	6
Costs for performing the RI/FS	1
Remediation costs	13
Accrued costs	14
ACE [Member]
Settlement agreement payment	$ 1