Goodwill And Intangible Assets (Schedule Of Other Intangible Asset Balances For Continuing Operations) (Details) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]
Gross		$ 1,614	$ 1,626
Accumulated Amortization		(465)	(457)
Net		1,149	1,169
Customer relationships
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]
Gross		649	659
Accumulated Amortization		(429)	(423)
Net		219	236
Other [Member]
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]
Gross		77	79
Accumulated Amortization		(35)	(34)
Net		41	45
Trade Names [Member]
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]
Gross	[1]	888	888
Net	[1]	$ 888	$ 888

[1] Not subject to amortization.