Goodwill And Other Intangibles (Components Of Other Intangibles) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,382	$ 5,382
Accumulated Amortization	(3,756)	(3,319)
Net Carrying Amount	1,626	2,063
Customer Base [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,188	5,188
Accumulated Amortization	(3,721)	(3,294)
Net Carrying Amount	1,467	1,894
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	(35)	(25)
Net Carrying Amount	$ 37	$ 47