Regulatory Matters (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended			11 Months Ended	3 Months Ended
	Mar. 31, 2010 Virginia Electric and Power Company [Member]	Mar. 31, 2012 Virginia Electric and Power Company [Member]	Mar. 31, 2012 Virginia Electric and Power Company [Member] Virginia Regulation Base Roe	Dec. 31, 2011 Virginia Electric and Power Company [Member] Virginia Regulation Base Roe	Nov. 30, 2011 Virginia Electric and Power Company [Member] Virginia Regulation Base Roe	Mar. 31, 2012 Virginia Electric and Power Company [Member] Virginia Regulation Rider R and S	Mar. 31, 2012 Virginia Electric and Power Company [Member] Virginia Regulation Rider R	Mar. 31, 2012 Virginia Electric and Power Company [Member] Virginia Regulation Rider S	Mar. 31, 2012 Virginia Electric and Power Company [Member] Virginia Regulation Rider B MW	Mar. 31, 2012 Virginia Electric and Power Company [Member] North Carolina Regulation	Mar. 31, 2012 East Ohio [Member] Ohio Regulation [Member]
Authorized ROE		11.40%				11.40%			12.40%
Incentive For Four Electric Transmission Enhancement Projects		1.50%
Incentive For Seven Electric Transmission Enhancement Projects		1.25%
Costs Claimed To Be Unjust And Excluded From Transmission Formula Rate	$ 223,000,000
Potential Settlement Required Annual Payment For 10 Years		250,000
Liability Due To Change In Estimate Of Future Billing Adjustments		36,000,000
New Authorized ROE			10.90%	10.90%	10.90%
Basis Points Enhancement To ROE						1.00%			2.00%
Basis Points Performance Incentive As Provided For By Regulation Act			0.50%
ROE Established In Virginia Settlement Approval Order					11.90%
Revenue Requirement Under Riders							74,000,000	226,000,000
Pre Commercial Operation Period Revenue Requirement Under Riders								52,000,000
Commercial Operation Period Revenue Requirement Under Riders								174,000,000
Rider B Renewable Generation Capacity									150
Approved Rider Revenue Requirement									6,000,000
Number Of Years Enhancement Basis Points Are Added To Rider									5 years
Proposed Increase Decrease In Base Revenue										64,000,000
Proposed Increase In Net Revenue										37,000,000
Proposed PIR Total Gross Plant Investment											73,000,000
Cumulative Gross Plant Investment											362,000,000
Proposed Revenue Requirement											$ 47,000,000