Goodwill And Other Intangible Assets (Significant Assumptions and Ranges of Assumptions Used in Impairment Analysis of Goodwill) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Impaired Intangible Assets And Goodwill [Line Items]
Residual growth rate	3.00%	3.00%
Minimum [Member]
Schedule Of Impaired Intangible Assets And Goodwill [Line Items]
Weighted-average cost of capital	11.50%	13.00%
Maximum [Member]
Schedule Of Impaired Intangible Assets And Goodwill [Line Items]
Weighted-average cost of capital	12.00%	14.75%