Regulatory Matters (Narrative) (Details) (USD $)	12 Months Ended			11 Months Ended	12 Months Ended	1 Months Ended				12 Months Ended	1 Months Ended		12 Months Ended						1 Months Ended	12 Months Ended			1 Months Ended						12 Months Ended				1 Months Ended	12 Months Ended	1 Months Ended		12 Months Ended	1 Months Ended			12 Months Ended	1 Months Ended				12 Months Ended	1 Months Ended																																		12 Months Ended	1 Months Ended	6 Months Ended		1 Months Ended	11 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Nov. 30, 2012 Virginia Regulation	Dec. 31, 2012 Virginia Regulation	Dec. 31, 2012 Virginia Regulation Rider C1 and C2	Dec. 31, 2012 Virginia Regulation Rider R and S	Dec. 31, 2012 Ohio Regulation	Mar. 31, 2012 Ohio Regulation mi	Dec. 31, 2012 Ohio Regulation	May 31, 2012 Virginia Electric and Power Company	Mar. 31, 2010 Virginia Electric and Power Company	Dec. 31, 2012 Virginia Electric and Power Company	Dec. 31, 2011 Virginia Electric and Power Company	Dec. 31, 2010 Virginia Electric and Power Company	Sep. 01, 2008 Virginia Electric and Power Company Project	Jul. 31, 2008 Virginia Electric and Power Company Project	Sep. 30, 2012 Virginia Electric and Power Company Minimum	Jan. 31, 2013 Virginia Electric and Power Company Subsequent Event Minimum	Dec. 31, 2012 Virginia Electric and Power Company Scenario, Forecast	Jul. 31, 2008 Virginia Electric and Power Company 1.5% Percent Incentive Rate For Projects Project	Jul. 31, 2008 Virginia Electric and Power Company 1.25 % Incentive Rate For Projects Project	Dec. 31, 2012 Virginia Electric and Power Company Virginia Regulation	Nov. 30, 2012 Virginia Electric and Power Company Virginia Regulation mi	Jul. 31, 2012 Virginia Electric and Power Company Virginia Regulation	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation kV mi	May 31, 2012 Virginia Electric and Power Company Virginia Regulation	Oct. 31, 2011 Virginia Electric and Power Company Virginia Regulation MW	Dec. 31, 2013 Virginia Electric and Power Company Virginia Regulation mi	Dec. 31, 2012 Virginia Electric and Power Company Virginia Regulation mi	Dec. 31, 2011 Virginia Electric and Power Company Virginia Regulation	Dec. 31, 2009 Virginia Electric and Power Company Virginia Regulation	Dec. 31, 2011 Virginia Electric and Power Company Virginia Regulation Base Roe	Dec. 31, 2012 Virginia Electric and Power Company Virginia Regulation Base Roe	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider R and S	Mar. 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider R and S	Dec. 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider R and S	Jan. 31, 2013 Virginia Electric and Power Company Virginia Regulation Rider R and S April 2013 Subsequent Event	Apr. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider C1A	Apr. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider C2A	Dec. 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider R	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	Mar. 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider R April 2014	Mar. 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider S	Dec. 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider S	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	Mar. 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider S Pre Commercial	Mar. 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider S Post Commercial	Aug. 31, 2012 Virginia Electric and Power Company Virginia Regulation Riders C1A And C2A DSM_Program	Aug. 31, 2012 Virginia Electric and Power Company Virginia Regulation Riders C1A And C2A April 2013	Aug. 31, 2012 Virginia Electric and Power Company Virginia Regulation Riders C1A And C2A April 2014	Apr. 30, 2012 Virginia Electric and Power Company Virginia Regulation Riders C1A And C2A Residential Customers DSM_Program	Apr. 30, 2012 Virginia Electric and Power Company Virginia Regulation Riders C1A And C2A Commercial Customers DSM_Program	Apr. 30, 2012 Virginia Electric and Power Company Virginia Regulation Riders C1A And C2A Peak Shaving	Aug. 31, 2012 Virginia Electric and Power Company Virginia Regulation Riders C1A And C2A Air Conditioner Cycling Program	Aug. 31, 2012 Virginia Electric and Power Company Virginia Regulation Riders C1A And C2A Low Income Program	May 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider T	Jul. 31, 2011 Virginia Electric and Power Company Virginia Regulation Rider T	Aug. 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider T1	May 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider T1	May 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider T1 Minimum	May 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider T1 Maximum	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider W	Feb. 28, 2012 Virginia Electric and Power Company Virginia Regulation Rider W	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider W April 2013	Jun. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider B	Mar. 31, 2012 Virginia Electric and Power Company Virginia Regulation Rider B MW	Jan. 31, 2013 Virginia Electric and Power Company Virginia Regulation Rider B Subsequent Event	Nov. 30, 2012 Virginia Electric and Power Company Virginia Regulation Rider BW	Aug. 31, 2012 Virginia Electric and Power Company Virginia Regulation Bremo Power Station MW	Dec. 31, 2012 Virginia Electric and Power Company North Carolina Regulation	Sep. 30, 2012 Virginia Electric and Power Company North Carolina Regulation	Aug. 31, 2012 Virginia Electric and Power Company North Carolina Regulation	Mar. 31, 2012 Virginia Electric and Power Company North Carolina Regulation	Dec. 31, 2011 Virginia Electric and Power Company North Carolina Regulation	Dec. 31, 2012 Virginia Electric and Power Company North Carolina Regulation Minimum	Dec. 31, 2012 Virginia Electric and Power Company North Carolina Regulation Maximum	Feb. 28, 2012 East Ohio Ohio Regulation	Dec. 31, 2012 East Ohio Ohio Regulation	Dec. 31, 2012 East Ohio Ohio Regulation Scenario, Forecast	Jun. 30, 2012 East Ohio Ohio Regulation Percentage Of Income Payment Plan Rider	Jun. 30, 2012 East Ohio Ohio Regulation Percentage Of Income Payment Plan Rider Scenario, Forecast	Mar. 31, 2012 East Ohio Ohio Regulation Uncollectible Expense Rider	Feb. 28, 2013 East Ohio Ohio Regulation Uncollectible Expense Rider Scenario, Forecast
Regulatory Matters [Line Items]
Authorized Roe													11.40%																		12.40%	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
Accrued ancillary services																		33,000,000
Payments for accrued ancillary services																			33,000,000
Basis points representing allowed range of Roe																														0.50%
Roe established in Virginia settlement approval order																														11.90%
Basis points performance incentive for meeting certain RPS targets																																		0.50%
Basis points enhancement to Roe				1.00%																															1.00%	1.00%	1.00%																												1.00%			2.00%	2.00%		1.00%
Roe Virginia Power believes it earned during 2009 and 2010 test years																														13.30%
Percent of earnings above Upper end of Authorized Roe earning band forfeited due to exceeding Roe authorization																														60.00%
Earnings forfeited due to exceeding Roe authorization																														78,000,000
Customer refund credit amortization period	6 months
Actual aggregate expected refund due to exceeding Roe authorization																														81,000,000
Fuel inventory costs included in base rate																															188,000,000
Payout ratio for Aip and Ltip Expenses																														100.00%
Incentive plan costs that exceeded 100 percent payout ratio					21,000,000
Incentive compensation expense																														95,000,000
Reduced operating costs for purposes of earnings test																														103,000,000
Gain on settlement of interest rate hedging Contracts																														44,000,000
Increase (decrease) in Regulatory Liabilities																							50,000,000
Proposed fuel revenue requirement decrease																											389,000,000																																																27,000,000
Revenue requirement under riders																																							5,000,000	17,000,000	78,000,000					199,000,000																				34,000,000
Placeholder return on equity																																					12.30%
New Authorized Roe						10.40%	11.40%																										10.90%	10.90%
Authorized return on equity																																			11.40%	11.40%																													11.40%			12.40%	12.40%		11.40%		10.20%
Proposed revenue requirement																																						248,000,000				81,000,000	75,000,000	74,000,000	226,000,000		249,000,000	229,000,000	52,000,000	174,000,000		4,000,000	23,000,000						473,000,000			373,000,000			86,000,000			12,000,000	6,000,000		45,000,000									47,000,000
Actual revenue requirement																																										78,000,000	72,000,000
Proposed increase decrease revenue requirement																																																													100,000,000		100,000,000	18,000,000			83,000,000
Number of demand side management programs in which extension was requested																																																			2			4	2
Period for demand side management programs																																																						5 years	5 years	5 years	5 years	2 years
Cost recovery cap																																																						90,000,000	45,000,000	14,000,000
Proposed revenue requirement under Rider to go into effect April 1, 2011 for the rate year ending March 31, 2012																																																											481,000,000	466,000,000
Increase in revenue under revenue requirements For Riders																																																											144,000,000
Authorized return on equity enhancement Period																																																																		10 years			5 years		15 years
Rider B renewable generation capacity																																																																					150
Approved revenue requirement																																																																						12,000,000
Capacity preserved from converting units from coal to natural gas																																																																								227
Capacity of facility of company owned solar distribution generation facilities																												30
Capacity of facility of company owned solar distribution generation facilities phase one																												10
Capacity of facility of company owned solar distribution generation facilities phase two																												20
Percentage of energy output purchased																											100.00%
Fixed price of energy output purchased																											0.15
Period to purchase energy output																											5 years
Total cost capitalization																								80,000,000
Virginia Powers portion of Mt Storm to doubs line rebuild																														96
Portion of Dooms to bremo that will replaced																													43
Alternative route for line																										37
KV Line																										500
Length of rebuild line																								39
Period to reopen proceeding																									60 days
North Carolina fuel revenue decrease from proposed settlement																																																																													36,000,000
Fuel factor application annual decrease in fuel expense recovery																																																																													13,000,000
Proposed increase decrease in base revenue																																																																												64,000,000
Proposed non fuel revenue increase																																																																										24,000,000	53,000,000
Approved non-fuel base revenue																																																																									36,000,000
Approved base fuel revenues																																																																									14,000,000
Base revenue approved																																																																									22,000,000
Net regulatory assets																																																																									17,000,000
Net regulatory assets recovery period																																																																														5 years	10 years
Approved non base fuel experience modification factor revenues																																																																									17,000,000
New annual amount of Pir spending per stipulation									200,000,000
Miles of pipeline identified to be replaced									1,450
Current annual Pir capital investment										120,000,000
Proposed annual Pir captial investment										160,000,000
Proposed PIR total gross plant investment																																																																																73,000,000
Cumulative gross plant investment																																																																																362,000,000
Percent of household income that becomes monthly payment										6.00%
Period for elimination of customer arrearage																																																																																	24 months
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
Allowance for doubtful accounts receivable, charge-offs																																																																																					1,000,000
Allowance for doubtful accounts receivable, recoveries																																																																																						23,000,000
Amouont of capital expenditures depreciation and property tax can be deferred on								95,000,000
Plant construction and other property additions (including nuclear fuel)	$ 4,145,000,000	$ 3,652,000,000	$ 3,422,000,000										$ 2,082,000,000	$ 1,885,000,000	$ 2,113,000,000																																																																			$ 93,000,000