Basis of Presentation and Accounting Policies (details) - Dominion (USD $)			0 Months Ended
Sep. 30, 2014	Dec. 31, 2013	Nov. 01, 2013 Dominion [Member]
Business Acquisition
Purchase price			$ 1,035,000,000
Assets acquired			3,910,000,000
Liabilities assumed			2,880,000,000
Intangible assets acquired			16,000,000
Goodwill acquired	$ 3,621,000,000	$ 3,634,000,000	$ 273,000,000

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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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.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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