Other Postretirement Employee Benefit Plans (Weighted Average Assumptions Used To Determine Benefit Obligations) (Details) - Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.20%	4.00%
Medical trend rate - initial	6.80%	7.10%
Medical trend rate - grading period	22 years	14 years
Medical trend rate - ultimate	4.50%	4.50%