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Other Postretirement Benefit Plans (Schedule Of Actuarial Assumptions Used In The Determination Of The Net Periodic Postretirement Cost In The Plan) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule Of Change In Benefit Obligation, Change In Plan Assets, The Plan's Funded Status And The Liability Reflected In The Consolidated Balance Sheet [Line Items]
Weighted average discount rate	5.28%	5.79%	6.09%
Net Periodic Postretirement Cost [Member] \| Other Postretirement Benefit Plans [Member]
Schedule Of Change In Benefit Obligation, Change In Plan Assets, The Plan's Funded Status And The Liability Reflected In The Consolidated Balance Sheet [Line Items]
Weighted average discount rate	4.35%	4.65%	5.70%
Initial trend	8.06%	8.50%	8.00%
Ultimate trend	5.00%	5.00%	5.00%
Year ultimate cost trend reached	2018	2018	2017

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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