Goodwill And Other Intangible Assets (Schedule Of Change In Goodwill) (Details) - USD ($)		3 Months Ended
		Mar. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of goodwill and intangible assets			$ 0
Goodwill [Roll Forward]
Balance at January 1, 2019		$ 1,802,670,000
Additions		0
Other	[1]	86,000
Balance at March 31, 2019		$ 1,802,756,000	$ 1,802,670,000

[1] Amount relates to