Retirement Benefits (Assumptions Used To Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate at measurement date	5.55%	3.00%	2.75%
Expected return on plan assets	6.75%	6.50%	6.50%
Increase in future compensation	3.50%	3.50%	3.50%
Cash balance pension plan interest crediting rate	5.00%	5.00%	5.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase for 2023	4.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase for 2024	4.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate for 2023	5.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate for 2024	5.50%
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate at measurement date	5.55%	3.00%	2.75%
Expected return on plan assets	6.75%	6.50%	6.50%
Increase in future compensation	3.50%	3.50%	3.50%
Medical cost trend rate (initial)		5.00%	5.00%
Medical cost trend rate (ultimate)	5.00%	5.00%	5.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase for 2023	4.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase for 2024	4.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Pre-Medicare Plan Participants	7.25%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Post-Medicare Plan Participants	6.75%
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate	2030
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year, Post-Medicare Plan Participants Adjustment	3.00%
Postretirement Health Coverage
Defined Benefit Plan Disclosure [Line Items]
Medical cost trend rate (initial)	2.50%	2.50%
Medical cost trend rate (ultimate)	2.50%	3.00%	3.00%