Regulatory Matters (Narrative) (Details) (USD $)	1 Months Ended	6 Months Ended		1 Months Ended	6 Months Ended														3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Mar. 31, 2010 Virginia Electric and Power Company	Jun. 30, 2012 Virginia Electric and Power Company	Jun. 30, 2012 Virginia Electric and Power Company Minimum	May 31, 2012 Virginia Electric and Power Company Virginia Regulation	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider T1	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider T1 Minimum	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider T1 Maximum	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider T	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider R and S	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider R April 2013	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider R April 2014	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider S April 2013	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider S April 2014	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider B	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider W	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Riders C1 and C2 Residential Customers DSM_Programs	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Riders C1 and C2 Commercial Customers DSM_Programs	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Riders C1 and C2 Peak Shaving	Mar. 31, 2012 East Ohio Ohio Regulation Uncollectible Expense Rider Subsequent Event	Jun. 30, 2012 East Ohio Ohio Regulation Percentage Of Income Payment Plan Rider Subsequent Event	Jun. 30, 2012 Scenario, Forecast East Ohio Ohio Regulation Uncollectible Expense Rider Subsequent Event	Jun. 30, 2012 Scenario, Forecast East Ohio Ohio Regulation Percentage Of Income Payment Plan Rider Subsequent Event
Regulatory Matters [Line Items]
Authorized ROE		11.40%							11.40%					12.40%	11.40%
Incentive for 4 electric transmission enhancement projects		1.50%
Incentive for 7 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			33,000,000
Proposed revenue requirement decrease				389,000,000
Proposed revenue requirement					373,000,000			473,000,000		81,000,000	75,000,000	249,000,000	229,000,000	12,000,000	86,000,000
Proposed increase decrease revenue requirement						100,000,000	18,000,000
Basis points enhancement to ROE									1.00%					2.00%	1.00%
DSM Programs																4	2
Period for DSM Programs																5 years	5 years	5 years
Cost Cap																90,000,000	45,000,000	14,000,000
Number of DSM Programs Rejected																1	1
Elimination of accumulated unrecovered bad debt expense																			1,000,000
Recovery of prospective bad debt expense																					23,000,000
Refund of overrecovery of accumulated arrearages																				70,000,000
Period for refund of overrecovery of accumulated arrearages																				2 years
Recovery of projected deferred program costs																						$ 104,000,000