Employee Benefit Plans (Principal Assumptions In Developing Net Periodic Pension Cost) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	4.00%	3.50%
Expected return on plan assets (as a percent)	7.10%	6.30%
Rate of compensation increase (as a percent)	4.70%	3.80%
Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	4.00%	3.80%