Retirement Plans (Schedule Of Assumptions Used) (Details)	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension [Member]
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Discount rate - used at period end to value obligation (in hundredths)	3.10%	2.90%	5.50%	2.90%	2.60%
Discount rate - used to compute annual cost (in hundredths)	2.60%	3.10%	2.90%		3.40%
Expected long-term rate of return on plan assets (in hundredths)	7.50%	7.50%	7.50%	7.50%	7.50%
Rate of increase in compensation levels (in hundredths)	2.00%	2.00%	3.00%		2.00%
OPEB [Member]
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Discount rate - used at period end to value obligation (in hundredths)	3.30%	3.00%	5.50%	3.00%
OPEB [Member] | Minimum [Member]
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Discount rate - used at period end to value obligation (in hundredths)					2.60%
Discount rate - used to compute annual cost (in hundredths)	2.60%	2.80%	3.00%		3.40%
OPEB [Member] | Maximum [Member]
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Discount rate - used at period end to value obligation (in hundredths)					2.80%
Discount rate - used to compute annual cost (in hundredths)	2.80%	3.30%	5.60%		3.50%