Goodwill And Intangible Assets (Schedule Of Other Intangible Asset Balances For Continuing Operations) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]
Gross		$ 2,333	$ 2,101
Accumulated Amortization		(542)	(513)
Net		1,791	1,588
Customer Relationships [Member]
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]
Gross		662	469
Accumulated Amortization		(425)	(406)
Net		237	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		101	62
Accumulated Amortization		(41)	(35)
Net		60	27
Trade Names [Member]
Finite Lived and Indefinite Lived Intangible Assets by Major Class [Line Items]
Gross	[1]	1,481	1,482
Net	[1]	$ 1,481	$ 1,482

[1] Not subject to amortization