Goodwill And Other Intangibles (Components Of Other Intangibles) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,526	$ 5,382
Accumulated Amortization	(3,406)	(3,888)
Net Carrying Amount	1,120	1,494
Customer Base [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,332	5,188
Accumulated Amortization	(3,356)	(3,848)
Net Carrying Amount	976	1,340
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	122	122
Net Carrying Amount	122	122
Royalty Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	72	72
Accumulated Amortization	(50)	(40)
Net Carrying Amount	$ 22	$ 32