Goodwill And Other Intangibles (Components Of Other Intangibles) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets [Line Items]
Gross Carrying Amount, Total	$ 4,526	$ 5,382
Accumulated Amortization	(3,506)	(3,888)
Net Carrying Amount	1,020	1,494
Trade Name [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, Indefinite	122	122
Net Carrying Amount	122	122
Customer Base [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, Finite	4,332	5,188
Accumulated Amortization	(3,452)	(3,848)
Net Carrying Amount	880	1,340
Royalty Agreement [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, Finite	72	72
Accumulated Amortization	(54)	(40)
Net Carrying Amount	$ 18	$ 32