Employee Stock And Incentive Plan (Schedule Of Performance Goals) (Details) - Performance Share Units [Member]	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Metric 1	25.00%	26.47%
Metric 2	25.00%	26.47%
Metric 3	25.00%	23.53%
Metric 4	25.00%	23.53%