Asbestos-Related Liabilities (Summary Of Percentage Of Outstanding Claims Related To Claimants Alleging Serious Diseases) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Claims alleging serious diseases	18.00%	18.00%	16.00%
Pre-1964 Claims in States without Asbestos Legislation [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Claims alleging serious diseases	33.00%	31.00%	29.00%