Goodwill And Other Intangibles (Components Of Goodwill By Reporting Units) (Details) $ in Millions	9 Months Ended
Sep. 30, 2015 USD ($)
Indefinite-lived Intangible Assets by Segment [Line Items]
Goodwill, Beginning Balance	$ 7,205
Goodwill, Ending Balance	7,166
Connecticut Operations [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Purchase accounting adjustments	(53)
Goodwill, Ending Balance	815
Other Acquisitions [Member]
Indefinite-lived Intangible Assets by Segment [Line Items]
Acquisition	$ 14

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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