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Earnings Per Share (Calculation of Basic and Diluted EPS) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income attributable to Dominion Energy	$ 449	$ 390	$ 952	$ 1,022
Average shares of common stock outstanding – Basic	652.8	629.2	651.6	628.7
Net effect of dilutive securities	0.3		0.2
Average shares of common stock outstanding – Diluted	653.1	629.2	651.8	628.7
Earnings Per Common Share – Basic	$ 0.69	$ 0.62	$ 1.46	$ 1.63
Earnings Per Common Share – Diluted	$ 0.69	$ 0.62	$ 1.46	$ 1.63

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