Regulatory Matters (Narrative) (Details) (USD $)	1 Months Ended				6 Months Ended	12 Months Ended	6 Months Ended			1 Months Ended								0 Months Ended	1 Months Ended			12 Months Ended	1 Months Ended		6 Months Ended
	May 31, 2012 Virginia Electric and Power Company	Mar. 31, 2010 Virginia Electric and Power Company	Jul. 31, 2008 Virginia Electric and Power Company Project	Apr. 30, 2008 Virginia Electric and Power Company	Jun. 30, 2013 Virginia Electric and Power Company Project	Dec. 31, 2012 Virginia Electric and Power Company Project	Jun. 30, 2013 Virginia Electric and Power Company Scenario, Forecast	Jul. 31, 2008 Virginia Electric and Power Company 1.5% Incentive Rate For Projects Project	Jul. 31, 2008 Virginia Electric and Power Company 1.25% Incentive Rate For Projects Project	May 31, 2013 Virginia Electric and Power Company Virginia Regulation	Jun. 30, 2013 Virginia Electric and Power Company Virginia Regulation Rider S	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider S April 2014	May 31, 2013 Virginia Electric and Power Company Virginia Regulation Rider W	May 31, 2013 Virginia Electric and Power Company Virginia Regulation Rider W Preceding Operations Period	May 31, 2013 Virginia Electric and Power Company Virginia Regulation Rider W Operations Period	Jun. 30, 2013 Virginia Electric and Power Company Virginia Regulation Rider B	Nov. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider BW	Aug. 06, 2013 Virginia Electric and Power Company Virginia Regulation Rider BW Subsequent Event	May 31, 2013 Virginia Electric and Power Company Virginia Regulation Rider T1	May 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider T1	May 31, 2013 East Ohio Ohio Regulation	Dec. 31, 2008 East Ohio Ohio Regulation	Jul. 31, 2013 East Ohio Ohio Regulation PIPP Plus Program Subsequent Event	Jul. 31, 2013 East Ohio Ohio Regulation PIPP Plus Program Scenario, Forecast Subsequent Event	Jun. 30, 2013 East Ohio Ohio Regulation UEX Rider	Jun. 30, 2013 East Ohio Ohio Regulation UEX Rider Scenario, Forecast
Regulatory Matters [Line Items]
Authorized ROE				11.40%							12.50%		12.50%			13.50%	11.40%	11.40%
Number of electric transmission projects			11			11		4	7
Incentive for 4 electric transmission enhancement projects			1.50%
Incentive for 7 electric transmission enhancement projects					1.25%
Number of electric transmission projects cancelled						1
Estimated cost of project abandonment						$ 7,000,000
Number of transmission projects approved					10
Estimated cost for electric transmission projects							852,000,000
Costs claimed to be unjust and excluded from transmission formula rate		223,000,000
Potential settlement required annual payment for 10 Years					250,000
Settlement payment duration	10 years
Proposed revenue requirement										162,000,000									81,000,000
Basis points enhancement to Roe											1.00%		1.00%			2.00%	1.00%	1.00%
Proposed revenue requirement												287,000,000	122,000,000	70,000,000	52,000,000	22,000,000	45,000,000			404,000,000
Period of commercial operations														8 months	4 months		15 years	10 years
Actual revenue requirement																		43,000,000
Percentage of pipeline system to be replaced																						20.00%
Approved revenue requirement																					67,000,000
Refund of over-recovery of accumulated arrearages																							91,000,000
Projected deferred program costs																								54,000,000
Accumulated unrecovered bad debt expense																									3,000,000
Recovery of prospective bad debt expense																										$ 24,000,000