Goodwill And Other Intangibles (Components Of Other Intangibles) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,382	$ 5,282
Accumulated Amortization	(3,159)	(2,620)
Net Carrying Amount	2,223	2,662
Customer Base [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,188	5,088
Accumulated Amortization	(3,137)	(2,604)
Net Carrying Amount	2,051	2,484
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	122	122
Net Carrying Amount	122	122
Royalty Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	72	72
Accumulated Amortization	(22)	(16)
Net Carrying Amount	$ 50	$ 56