Pension, OPEB and Savings Plans (Schedule Of Percentage Of Fair Value Of Total Plan Assets) (Details)	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation, percent	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation, percent	69.00%	64.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation, percent	29.00%	33.00%
Real Estate Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation, percent	0.00%	1.00%
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocation, percent	2.00%	2.00%