Other Intangibles (Components Of Other Intangibles) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,120	$ 3,120
Accumulated Amortization	(2,053)	(1,977)
Net Carrying Amount	1,067	1,143
Customer Base [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,998	2,998
Accumulated Amortization	(2,053)	(1,977)
Net Carrying Amount	945	1,021
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	122	122
Net Carrying Amount	$ 122	$ 122