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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
U.S. statutory rate (percentage)	35.00%	35.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit (percentage)	2.40%	3.70%	0.00%
Investment tax credits (percentage)	(11.70%)	(4.70%)	(8.60%)
Production tax credits (percentage)	(0.80%)	(0.80%)	(1.20%)
Valuation allowances (percentage)	1.20%	(0.30%)	0.70%
AFUDC - equity (percentage)	(0.60%)	(0.30%)	0.00%
Legislative change (percentage)	(0.60%)	(0.10%)	0.00%
Employee stock ownership plan deduction (percentage)	(0.60%)	(0.60%)	(0.90%)
Other, net (percentage)	(1.40%)	0.10%	0.40%
Effective tax rate (percentage)	22.90%	32.00%	25.40%
Virginia Electric and Power Company
Income Tax Contingency [Line Items]
U.S. statutory rate (percentage)	35.00%	35.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit (percentage)	3.80%	3.90%	3.80%
Investment tax credits (percentage)	(0.00%)	(0.60%)	(0.00%)
Production tax credits (percentage)	(0.60%)	(0.60%)	(0.60%)
Valuation allowances (percentage)	0.10%	0.00%	0.00%
AFUDC - equity (percentage)	(0.60%)	(0.60%)	0.00%
Legislative change (percentage)	0.00%	0.00%	0.00%
Employee stock ownership plan deduction (percentage)	(0.00%)	(0.00%)	(0.00%)
Other, net (percentage)	(0.30%)	0.60%	0.80%
Effective tax rate (percentage)	37.40%	37.70%	39.00%
Dominion Gas Holdings, LLC
Income Tax Contingency [Line Items]
U.S. statutory rate (percentage)	35.00%	35.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit (percentage)	0.50%	2.70%	4.40%
Investment tax credits (percentage)	(0.00%)	(0.00%)	(0.00%)
Production tax credits (percentage)	(0.00%)	(0.00%)	(0.00%)
Valuation allowances (percentage)	0.00%	0.00%	0.00%
AFUDC - equity (percentage)	(0.20%)	0.20%	0.00%
Legislative change (percentage)	0.00%
Employee stock ownership plan deduction (percentage)	(0.00%)	(0.00%)	(0.00%)
Other, net (percentage)	0.10%	0.30%	0.10%
Effective tax rate (percentage)	35.40%	38.20%	39.50%

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