Employee Benefit Plans (Schedule Of Detailed Pension And OPEB Benefit Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of net OPEB costs:
Net benefit costs	$ 95,000	$ 90,000	$ 104,000
Pension Plan [Member]
Assumptions Used to Determine Net Periodic Pension and OPEB Costs:
Discount rate	2.40%	3.13%	4.18%
Expected return on plan assets	4.35%	4.94%	5.42%
Rate of compensation increase	4.80%	4.64%	4.53%
Components of net OPEB costs:
Service cost	$ 33,000	$ 29,000	$ 25,000
Interest cost	84,000	103,000	128,000
Expected return on assets	(99,000)	(109,000)	(119,000)
Amortization of net loss	52,000	48,000	29,000
Net benefit costs	70,000	71,000	63,000
Other Changes in Plan Assets and Benefit Obligations Recognized as Regulatory Assets or in Other Comprehensive Income:
Net loss (gain)	(164,000)	61,000
Amortization of net loss	(52,000)	(48,000)	(29,000)
Total recognized as regulatory assets or other comprehensive income	(216,000)	13,000	(29,000)
Total recognized in net periodic pension and OPEB costs and as regulatory assets or other comprehensive income	$ (146,000)	$ 84,000	$ 34,000
OPEB Plan [Member]
Assumptions Used to Determine Net Periodic Pension and OPEB Costs:
Discount rate	2.58%	3.29%	4.41%
Expected return on plan assets	5.24%	5.90%	6.19%
Components of net OPEB costs:
Service cost	$ 5,000	$ 6,000	$ 6,000
Interest cost	26,000	32,000	43,000
Expected return on assets	(7,000)	(8,000)	(7,000)
Amortization of prior service cost (credit)	(17,000)	(20,000)	(20,000)
Amortization of net loss	18,000	10,000	19,000
Curtailment cost (credit)		(1,000)
Net benefit costs	25,000	19,000	41,000
Other Changes in Plan Assets and Benefit Obligations Recognized as Regulatory Assets or in Other Comprehensive Income:
Curtailment		2,000
Net loss (gain)	(142,000)	14,000	(22,000)
Amortization of net loss	(18,000)	(10,000)	(19,000)
Amortization of prior service (cost) credit	17,000	20,000	20,000
Total recognized as regulatory assets or other comprehensive income	(143,000)	26,000	(21,000)
Total recognized in net periodic pension and OPEB costs and as regulatory assets or other comprehensive income	$ (118,000)	$ 45,000	$ 20,000