Employee Benefit Plans (Principal Assumptions In Developing Year-End Actuarial Present Value Of The Projected Benefit Obligation) (Details)	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	3.70%	4.00%
Rate of compensation increase (as a percent)	4.60%	4.70%
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	3.90%	4.00%