Earnings Per Share (Calculation of Our Basic and Diluted EPS) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Earnings Per Share [Abstract]
Net income attributable to Dominion	$ 536		$ 379
Average shares of common stock outstanding - Basic (shares)	587,900,000		581,600,000
Net effect of potentially dilutive securities (shares)	2,000,000	[1]	1,300,000	[1]
Average shares of common stock outstanding - Diluted (shares)	589,900,000		582,900,000
Earnings Per Common Share – Basic and Diluted	$ 0.91		$ 0.65
Potentially dilutive securities excluded from the calculation of diluted EPS			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 14 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.