Regulatory Matters (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended	11 Months Ended	12 Months Ended	1 Months Ended	11 Months Ended	1 Months Ended		3 Months Ended		6 Months Ended	12 Months Ended								1 Months Ended	4 Months Ended	1 Months Ended	12 Months Ended		3 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	11 Months Ended	4 Months Ended	12 Months Ended	1 Months Ended	7 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2011	Mar. 31, 2011	Nov. 30, 2011	Dec. 31, 2011	Dec. 31, 2011 Rider R and S [Member]	Nov. 30, 2011 Rider R and S [Member]	Dec. 31, 2011 Virginia Power [Member]	Mar. 31, 2010 Virginia Power [Member]	Dec. 31, 2011 Virginia Power [Member] MW	Dec. 31, 2009 Virginia Power [Member]	Dec. 31, 2011 Virginia Power [Member]	Dec. 31, 2012 Virginia Power [Member] mi	Dec. 31, 2011 Virginia Power [Member] mi	Dec. 31, 2010 Virginia Power [Member]	Dec. 31, 2009 Virginia Power [Member]	Dec. 31, 2011 Virginia Power [Member] Base Roe [Member]	Dec. 31, 2011 Virginia Power [Member] Rider R and S [Member]	Dec. 31, 2011 Virginia Power [Member] Rider R [Member]	Dec. 31, 2011 Virginia Power [Member] Rider S [Member]	May 31, 2011 Virginia Power [Member] Rider T [Member]	Dec. 31, 2011 Virginia Power [Member] Rider T [Member]	Feb. 28, 2012 Virginia Power [Member] Rider W [Member]	Dec. 31, 2011 Virginia Power [Member] Rider W [Member]	Dec. 31, 2011 Virginia Regulation [Member]	Dec. 31, 2009 Parent [Member]	May 31, 2011 Cove Point [Member]	Dec. 31, 2011 Cove Point [Member]	Dec. 31, 2011 Rider C1 and C2 [Member]	Nov. 30, 2011 Rider C1 and C2 [Member]	Dec. 31, 2011 Rider C1 and C2 [Member] Virginia Power [Member]	Dec. 31, 2011 Rider C1 and C2 [Member] Virginia Power [Member]	Jun. 30, 2011 Rider B [Member] Virginia Power [Member]	Dec. 31, 2011 Rider B [Member] Virginia Power [Member]	Mar. 31, 2011 Ohio Regulation [Member] mi	Dec. 31, 2011 Ohio Regulation [Member]	Dec. 31, 2012 North Carolina Regulation [Member] Virginia Power [Member]	Dec. 31, 2011 North Carolina Regulation [Member] Virginia Power [Member]	Dec. 31, 2011 Virginia Regulation [Member] Rider C1 [Member] Virginia Power [Member]	Dec. 31, 2011 Virginia Regulation [Member] Rider C2 [Member] Virginia Power [Member]
Charge From 2009 Base Rate Review										$ 782,000,000															$ 12,000,000
Charge From 2009 Base Rate Review After Tax										477,000,000															8,000,000
Basis Points Representing Allowed Range Of Roe																								50
Roe Established In Virginia Settlement Approval Order				11.90%
New Authorized Roe					11.40%											10.90%												10.40%
Basis Points Performance Incentive For Meeting Certain RPS Targets																50
Old Authorized Roe						12.30%																							11.30%
Basis Points Enhancement To Roe			100														100					100											200
Authorized Roe													11.40%	12.40%	11.40%							11.40%									10.40%						10.70%
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
Actual Aggregate Expected Refund Due To Exceeding Roe Authorization													81,000,000
Fuel Inventory Costs Included In Base Rate														188,000,000	177,000,000
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
Fuel factor application annual decrease in fuel expense recovery											434,000,000																									13,000,000
Annual Fuel Factor Increase											319,000,000
Annual Fuel Factor Increase Rate Projected Balance Of Prior Year Under Recovered Fuel Expenses							217,000,000		217,000,000		217,000,000		217,000,000
Increase In Anticipated Fuel Expense In Next Fiscal Year											102,000,000
Revenue Requirement Under Riders																		78,000,000	199,000,000			35,000,000
Placeholder return on equity																	12.30%
Adjusted Proposed Rider Revenue Requirement																		76,000,000	231,000,000
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									72,000,000		6,000,000
Riders C1 And C2 Proposed Revenue Requirement For May 1 2012 Through April 30 2013																																						6,000,000	12,000,000
Riders C1 and C2 Filing Placeholder Roe																															11.30%
Increase In Revenue Under Revenue Requirements For Riders																				144,000,000
Number Of Years Enhancement Basis Points Are Added To Rider																							10 years
Capacity of Facility Of Company Owned Solar Distribution Generation Facilities									30
Capacity Of Facility Of Customer Owned Solar Distributed Generation Facilities									3
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
Virginia Powers Portion Of Mt Storm To Doubs Line Rebuild													96
Portion Of Hayes To Yorktown That will Be Constructed Overhead													4.2
Portion of Hayes To Yorktown That Will Be Constructed Underground													3.8
Portion of Dooms To Bremo That Will Replaced												43
North Carolina base revenue increase from proposed settlement																																					8,000,000
Percent of Capital Structure Made Up Of Long Term Debt																																					49.00%
Percent of Capital Structure Made Up Of Common Equity																																					51.00%
North Carolina fuel revenue decrease from proposed settlement																																				36,000,000
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
East Ohio Pir Program Revenue Requirement																																			37,000,000
Percent Of Household Income That Becomes Monthly Payment				6.00%
Projected Deferred Program Costs For Next Twelve Months		112,000,000
Bad Debt Expense Deferred For Recovery				62,000,000
Amouont Of Capital Expenditures Depreciation And Property Tax Can Be Deferred On	95,000,000
Incentive For Four Electric Transmission Enhancement Projects													1.50%
Incentive For Seven Electric Transmission Enhancement Projects													1.30%
Expected Cost Of Eleven Electric Transmission Enhancement Projects													877,000,000
Costs Claimed To Be Unjust And Excluded From Transmission Formula Rate								223,000,000
Potential Settlement Required Annual Payment For 10 Years													250,000
Operating Level Where Customers Pay Uniform Rate Based On Cost													500
Operating Level Where Customers Pay On A Beneficiary Pays Approach													500
Liability Due To Change In Estimate Of Future Billing Adjustments							36,000,000		36,000,000		36,000,000		36,000,000
Percentage of gathering gas retainage fee																											0.00%
Percentage of processing gas retainage fee																											0.50%
Proposed Annual Cost Of Service																										$ 150,000,000