Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

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
Nine Months Ended September 30,	2018			2017			2018			2017			2018			2017
U.S. statutory rate		21.0	%		35.0	%		21.0	%		35.0	%		21.0	%		35.0	%
Increases (reductions) resulting from:
State taxes, net of federal benefit		3.3			2.9			4.6			3.7			3.9			2.7
Investment tax credits		(0.9	)		(5.7	)		(1.4	)		(0.8	)		—			—
Production tax credits		(0.7	)		(0.7	)		(0.7	)		(0.5	)		—			—
Reversal of excess deferred income     taxes		(1.5	)		—			(1.9	)		—			(1.3	)		—
Federal legislative change		2.0			—			(0.2	)		—			2.0			—
State legislative change		(0.8	)		—			—			—			0.1			—
AFUDC - equity		(0.9	)		(1.3	)		(0.5	)		(0.6	)		(0.4	)		(0.8	)
Other, net		(1.0	)		(2.6	)		(0.3	)		0.2			0.7			(0.1	)
Effective tax rate		20.5	%		27.6	%		20.6	%		37.0	%		26.0	%		36.8	%