Goodwill And Other Intangibles (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 80	$ 66	$ 260	$ 218
Customer List [Member] | Residential Customer List [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life			9 years
Customer List [Member] | Business Customer List [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life			12 years