Employee Benefit Plans (Principal Assumptions In Developing Year-End Actuarial Present Value Of The Projected Benefit Obligation) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Document Period End Date	Dec. 31, 2019
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	2.90%	3.90%
Rate of compensation increase (as a percent)	4.90%	4.90%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	3.20%	4.30%