Postretirement Plans (Schedule Of Actual Allocations For The Pension Assets And Target Allocations By Asset Class) (Details) (Pension Plans [Member])	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage of Plan Assets	100.00%	100.00%
Target Allocations	100.00%	100.00%
Global Equity [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage of Plan Assets	26.00%	33.00%
Target Allocations	30.00%	28.00%
Private Equity [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage of Plan Assets	6.00%	5.00%
Target Allocations	6.00%	6.00%
Real Estate And Real Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage of Plan Assets	6.00%	5.00%
Target Allocations	6.00%	10.00%
Global Strategies [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage of Plan Assets	4.00%	4.00%
Target Allocations	4.00%	5.00%
Hedge Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage of Plan Assets	5.00%	4.00%
Target Allocations	5.00%	6.00%
Fixed Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage of Plan Assets	53.00%	49.00%
Target Allocations	49.00%	45.00%