Earnings Per Share (Calculation of Our Basic and Diluted EPS) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income attributable to Dominion		$ 413	$ 159	$ 949	$ 538
Average shares of common stock outstanding – Basic (shares)		591,500,000	581,900,000	589,700,000	581,700,000
Net effect of potentially dilutive securities (shares)	[1]	1,000,000	2,000,000	1,500,000	1,700,000
Average shares of common stock outstanding – Diluted (shares)		592,500,000	583,900,000	591,200,000	583,400,000
Earnings Per Common Share – Basic (in dollars per share)		$ 0.70	$ 0.27	$ 1.61	$ 0.92
Earnings Per Common Share – Diluted (in dollars per share)		$ 0.70	$ 0.27	$ 1.60	$ 0.92
Potentially dilutive securities excluded from the calculation of diluted EPS (shares)			0		0

[1] Dilutive securities consist primarily of the 2013 Equity Units for 2015 and contingently convertible senior notes and the 2013 Equity Units for 2014. See Note 15 in this report and Note 17 to the Consolidated Financial Statements in the Companies' Annual Report on Form 10-K for the year ended December 31, 2014 for more information.