Retirement, Postretirement And Other Benefit Plans (Weighted Average Assumptions Used In Measurement Of Benefit Obligations) (Details)	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.45%	3.73%
Rate of compensation increases	0.00%	0.00%
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.50%	3.75%
Health care cost trend rate, Pre-65	6.30%	6.50%
Health care cost trend rate, Post-65	7.40%	7.80%
Ultimate health care cost trend rate	4.50%	4.50%