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)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating Loss Carryforwards [Line Items]
U.S. statutory rate	35.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit	1.50%	1.90%
Investment and production tax credits	(5.90%)	(1.50%)
Valuation allowances	1.10%	0.00%
Other, net	(0.40%)	(1.30%)
Effective tax rate	31.30%	34.10%
Virginia Electric and Power Company
Operating Loss Carryforwards [Line Items]
U.S. statutory rate	35.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit	3.80%	2.60%
Investment and production tax credits	(0.60%)	0.00%
Valuation allowances	0.00%	0.00%
Other, net	0.60%	(1.20%)
Effective tax rate	38.80%	36.40%
Dominion Gas Holdings, LLC
Operating Loss Carryforwards [Line Items]
U.S. statutory rate	35.00%	35.00%
Increases (reductions) resulting from:
State taxes, net of federal benefit	3.70%	3.80%
Investment and production tax credits	0.00%	0.00%
Valuation allowances	0.00%	0.00%
Other, net	0.10%	0.20%
Effective tax rate	38.80%	39.00%