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Acquisitions and Dispositions (Acquisition of Dominion Questar) (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		1 Months Ended			3 Months Ended
	Sep. 16, 2016	Sep. 30, 2016	Aug. 31, 2016	Apr. 30, 2016	Mar. 31, 2017	Mar. 31, 2016
Business Acquisition [Line Items]
Issuance of common stock					$ 79	$ 75
Issuance of common stock					$ 79	$ 75
Dominion Questar Corporation
Business Acquisition [Line Items]
Price per share	$ 25.00
Total consideration	$ 4,400
Number of shares of Dominion Questar outstanding at closing	175.5
August 2016 issuance of senior notes			$ 1,300
Dominion Questar Corporation | Term loan agreement
Business Acquisition [Line Items]
Repayment of short-term notes		$ 1,200
Dominion Questar Corporation | Underwritten Public Offering
Business Acquisition [Line Items]
Issuance of common stock				$ 500
Dominion Questar Corporation | Series A RSNs
Business Acquisition [Line Items]
Issuance of common stock			$ 1,400

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