Employee Benefit Plans (Schedule Of Pension And OPEB Plan Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	$ 95,000	$ 90,000	$ 104,000
Less amounts deferred principally as property, regulatory asset or regulatory liability	(19,000)	(13,000)	(27,000)
Net amounts recognized as operation and maintenance expense or other deductions	76,000	77,000	77,000
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	70,000	71,000	63,000
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefit costs	$ 25,000	$ 19,000	$ 41,000