Pension and OPEB Plans (Schedule Of Pension And OPEB Plan Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7,000	$ 8,000	$ 23,000	$ 25,000
Interest cost	23,000	21,000	68,000	63,000
Expected return on assets	(26,000)	(25,000)	(79,000)	(75,000)
Amortization of net loss	8,000	13,000	24,000	39,000
Net costs	12,000	17,000	36,000	52,000
Net adjustments	(1,000)	(6,000)	(3,000)	(18,000)
Net pension costs recognized as operation and maintenance expense or other deductions	11,000	11,000	33,000	34,000
OPEB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1,000	1,000	3,000	3,000
Interest cost	6,000	7,000	18,000	20,000
Expected return on assets	(2,000)	(2,000)	(6,000)	(5,000)
Amortization of prior service cost		(4,000)		(12,000)
Amortization of net loss		4,000		13,000
Net costs	5,000	6,000	15,000	19,000
Net adjustments	3,000	2,000	8,000	4,000
Net pension costs recognized as operation and maintenance expense or other deductions	$ 8,000	$ 8,000	$ 23,000	$ 23,000