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Earnings Per Share (Calculation of Basic and Diluted EPS) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income attributable to Dominion $ 632 $ 524
Average shares of common stock outstanding – Basic (shares) 628.1 596.6
Net effect of dilutive securities (shares) [1] 0.0 1.6
Average shares of common stock outstanding – Diluted (shares) 628.1 598.2
Earnings Per Common Share – Basic (in dollars per share) $ 1.01 $ 0.88
Earnings Per Common Share – Diluted (in dollars per share) $ 1.01 $ 0.88
[1] Dilutive securities consist primarily of the 2013 Equity Units for the three months ended March 31, 2016. See Note 17 to the Consolidated Financial Statements in the Companies' Annual Report on Form 10-K for the year ended December 31, 2016 for more information.