Income Taxes (Tables)

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Effective Income Tax

For continuing operations, including noncontrolling interests, the statutory U.S. federal income tax rate reconciles to the Companies’ effective income tax rate as follows:

	Dominion Energy						Virginia Power						Dominion Energy Gas
Three Months Ended March 31,	2019			2018			2019			2018			2019			2018
U.S. statutory rate		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%		21.0	%
Increases (reductions) resulting from:
State taxes, net of federal benefit		2.2			4.1			4.6			4.5			3.4			4.3
Investment tax credits		(1.5	)		(0.5	)		(3.2	)		(0.9	)		—			—
Production tax credits		(0.8	)		(0.6	)		(1.0	)		(0.7	)		—			—
Reversal of excess deferred income     taxes		(5.1	)		(1.4	)		(5.0	)		(2.0	)		(1.1	)		(1.0	)
Write-off of regulatory assets		(34.1	)		—			—			—			—			—
Other, net		(2.0	)		(2.1	)		0.1			(0.3	)		(0.3	)		(0.4	)
Effective tax rate		(20.3	)%		20.5	%		16.5	%		21.6	%		23.0	%		23.9	%