Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill And Intangible Assets [Abstract]
Goodwill and trade name impairment	$ 0	$ 0	$ 0	$ 0
Accumulated impairment losses recorded in continuing operations	$ 0		$ 0