Commitments and Contingencies (Environmental Matters and Other Legal Matters) (Narrative) (Details) (USD $)	1 Months Ended				12 Months Ended			1 Months Ended		50 Months Ended	1 Months Ended	3 Months Ended
	Jun. 30, 2014 Unit	Jul. 31, 2013 Unit	Sep. 30, 2011 Party	Jul. 31, 2011	Dec. 31, 2014 Facility Site	Dec. 31, 2013	Dec. 31, 2012	May 31, 2014	Dec. 31, 2014	Sep. 30, 2014	Oct. 31, 2014 Facility	Dec. 31, 2013
Loss Contingencies [Line Items]
Compliance extension period	1 year
Number of coal fired generating units	2	3
Amount spent for emissions controls					$ 5,345,000,000	$ 4,065,000,000	$ 4,145,000,000
Number of parties ordered specific remedial action			22
Maximum civil penalties per day					37,500
Number of former manufactured gas plant sites					17				17
Number of facilities with CCR					8
Period for consideration of CO2 emissions for biomass projects				3 years
Charges associated with proposed settlement for ash pond closure costs					121,000,000	0	0
Required payments					50,000,000				50,000,000
Obligated Payments to Maryland Strategic Energy Investments Fund and Low Income Energy Assistance Programs
Loss Contingencies [Line Items]
Required payments								48,000,000
Obligated Payments to Maryland Strategic Energy Investments Fund
Loss Contingencies [Line Items]
Required payments								40,000,000
Period of required payments								5 years
Low Income Energy Assistance Programs
Loss Contingencies [Line Items]
Required payments								8,000,000
Period of required payments								20 years
Possum Point Power Station
Loss Contingencies [Line Items]
Charges associated with proposed settlement for ash pond closure costs									121,000,000
Clean Air Act
Loss Contingencies [Line Items]
Number of states under EPA Replacement Rule				28
Emissions of fossil fuel fired electric generating units				25
Number of groups of affected states				2
Amount spent for emissions controls										2,000,000
Clean Water Act
Loss Contingencies [Line Items]
Number of facilities											14
Remedial options
Loss Contingencies [Line Items]
Estimates for compliance, minimum					1,000,000				1,000,000
Estimates for compliance, maximum					22,000,000				22,000,000
Breach of Contract Lawsuit | Pending Litigation
Loss Contingencies [Line Items]
Amount of accrued liability										6,000,000
Dominion Gas Holdings, LLC
Loss Contingencies [Line Items]
Amount spent for emissions controls					719,000,000	650,000,000	928,000,000
Number of former manufactured gas plant sites					12				12
Virginia Electric and Power Company
Loss Contingencies [Line Items]
Charge reflecting plant balances that are not expected to be recovered												26,000,000
Charge reflecting plant balances not expected to be recovered, after tax												16,000,000
Amount spent for emissions controls					2,911,000,000	2,394,000,000	2,082,000,000
Number of former manufactured gas plant sites					3				3
Charges associated with proposed settlement for ash pond closure costs					$ 121,000,000	$ 0	$ 0
Virginia Electric and Power Company | Clean Water Act
Loss Contingencies [Line Items]
Number of facilities											11