Goodwill and Intangible Assets (Schedule Of Other Intangible Asset Balances For Continuing Operations) (Details) - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]
Gross		$ 2,249	$ 2,101
Accumulated Amortization		(531)	(513)
Net		1,718	1,588
Customer Relationships [Member]
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]
Gross		593	469
Accumulated Amortization		(418)	(406)
Net		176	64
Franchise Agreements [Member]
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]
Gross		88	88
Accumulated Amortization		(75)	(73)
Net		13	15
Other [Member]
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]
Gross		86	62
Accumulated Amortization		(39)	(35)
Net		47	27
Trade Names [Member]
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]
Gross	[1]	1,482	1,482
Net	[1]	$ 1,482	$ 1,482

[1] Not subject to amortization.