Summary Of Significant Accounting Policies (Schedule Of Rate Changes Implemented To Address Under- And Over-Collection Of Energy Costs) (Details)	Jan. 01, 2022	Jan. 01, 2021	Jan. 01, 2020	Jan. 01, 2019
Significant Accounting Policies [Line Items]
Percentage of total energy rate change		(15.90%)	(16.20%)	(1.30%)
Subsequent Event [Member]
Significant Accounting Policies [Line Items]
Percentage of total energy rate change	20.30%