Goodwill And Other Intangibles (Components Of Other Intangibles) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,120	$ 3,140
Accumulated Amortization	(1,977)	(1,640)
Net Carrying Amount	1,143	1,500
Customer Base [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,998	3,018
Accumulated Amortization	(1,977)	(1,640)
Net Carrying Amount	1,021	1,378
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	122	122
Net Carrying Amount	$ 122	$ 122