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, 2013	Dec. 31, 2012	Dec. 31, 2011
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	2.10%	4.20%	1.90%
Valuation allowances	(0.10%)	(0.70%)	0.00%
Investment and production tax credits	(2.40%)	(0.50%)	(0.60%)
AFUDC - equity	(0.60%)	(0.90%)	(0.60%)
Employee stock ownership plan deduction	(0.60%)	(0.70%)	(0.60%)
Other, net	(0.40%)	(0.60%)	(0.70%)
Effective tax rate	33.00%	35.80%	34.40%
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	3.10%	3.90%	4.40%
Valuation allowances	0.00%	0.00%	0.00%
Investment and production tax credits	(0.20%)	0.00%	0.00%
AFUDC - equity	(0.80%)	(0.90%)	(0.80%)
Employee stock ownership plan deduction	0.00%	0.00%	0.00%
Other, net	(0.40%)	0.30%	1.10%
Effective tax rate	36.70%	38.30%	39.70%