Goodwill And Other Intangibles (Components Of Other Intangibles) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Intangible Assets [Line Items]
Gross Carrying Amount, Total	$ 5,382	$ 5,282
Accumulated Amortization	(3,319)	(2,620)
Net Carrying Amount	2,063	2,662
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	5,188	5,088
Accumulated Amortization	(3,294)	(2,604)
Net Carrying Amount	1,894	2,484
Royalty Agreement [Member]
Intangible Assets [Line Items]
Gross Carrying Amount, Finite	72	72
Accumulated Amortization	(25)	(16)
Net Carrying Amount	$ 47	$ 56