Retirement Benefits (Assumptions Used To Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate at measurement date	3.00%	2.75%	3.50%
Expected return on plan assets	6.50%	6.50%	7.00%
Increase in future compensation	3.50%	3.50%	3.50%
Cash balance pension plan interest crediting rate	5.00%	5.00%	5.00%
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate at measurement date	3.00%	2.75%	3.50%
Expected return on plan assets	6.50%	6.50%	7.00%
Increase in future compensation	3.50%	3.50%	3.50%
Medical cost trend rate (initial)	5.00%	5.00%	5.00%
Medical cost trend rate (ultimate)	5.00%	5.00%	5.00%
Postretirement Health Coverage
Defined Benefit Plan Disclosure [Line Items]
Medical cost trend rate (initial)	2.50%	2.50%
Medical cost trend rate (ultimate)	3.00%