Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Rate as Compared to the Income Tax Expense Recorded in Our Consolidated Statements of Income) (Details)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
U.S. statutory rate	35.00%	35.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit	3.70%	0.00%	2.10%
Investment tax credits	(4.70%)	(8.60%)	(1.80%)
Production tax credits	(0.80%)	(1.20%)	(0.60%)
Valuation allowances	(0.30%)	0.70%	(0.10%)
AFUDC - equity	(0.30%)	0.00%	(0.60%)
Employee stock ownership plan deduction	(0.60%)	(0.90%)	(0.60%)
Other, net	0.00%	0.40%	(0.40%)
Effective tax rate	32.00%	25.40%	33.00%
Virginia Electric and Power Company
Income Tax Contingency [Line Items]
U.S. statutory rate	35.00%	35.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit	3.90%	3.80%	3.10%
Investment tax credits	(0.60%)	(0.00%)	(0.00%)
Production tax credits	(0.60%)	(0.60%)	(0.20%)
Valuation allowances	0.00%	0.00%	0.00%
AFUDC - equity	(0.60%)	0.00%	(0.80%)
Employee stock ownership plan deduction	(0.00%)	(0.00%)	(0.00%)
Other, net	0.60%	0.80%	(0.40%)
Effective tax rate	37.70%	39.00%	36.70%
Dominion Gas Holdings, LLC
Income Tax Contingency [Line Items]
U.S. statutory rate	35.00%	35.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit	2.70%	4.40%	4.30%
Investment tax credits	(0.00%)	(0.00%)	(0.00%)
Production tax credits	(0.00%)	(0.00%)	(0.00%)
Valuation allowances	0.00%	0.00%	0.00%
AFUDC - equity	0.20%	0.00%	(0.10%)
Employee stock ownership plan deduction	(0.00%)	(0.00%)	(0.00%)
Other, net	0.30%	0.10%	0.30%
Effective tax rate	38.20%	39.50%	39.50%

Effective Income Tax Rate Reconciliation Allowance For Funds Used During Construction Equity

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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