Goodwill And Other Intangibles (Components Of Other Intangibles) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,526	$ 5,382
Accumulated Amortization	(3,305)	(3,888)
Net Carrying Amount	1,221	1,494
Customer Base [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,332	5,188
Accumulated Amortization	(3,258)	(3,848)
Net Carrying Amount	1,074	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	(47)	(40)
Net Carrying Amount	$ 25	$ 32