Regulatory Matters (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Revenue Increase For Fuel	$ 37
Previously Deferred Fuel Costs	14
Ellisburg To Craigs Dekatherms Per Day Capacity	150,000
Dekatherms Per Day Northeast Expansion Project Is Expected To Provide	200,000
Expected Cost Of Northeast Expansion Project	100
Virginia Power [Member]
Basis Points Representing Allowed Range Of ROE	50
ROE Established In Virginia Settlement Approval Order	11.90%
ROE During 2009 And 2010 Test Years If Virginia Commission Accepts Virginia Commission Staff	14.11%
Total credit to customers if Virginia Commission accepts Virginia Commission staff accounting adjustments	143
ROE Virginia Power Believes It Earned During 2009 And 2010 Test Years	12.10%
ROE Virginia Power Is Requesting For 2011 And 2012	12.50%
Basis Points Performance Incentive As Provided For By Regulation Act	100
Virginia Commission Staff Recommended Prospective ROE	10.67%
Virginia Commission Staff RPS Performance Basis Points Incentive	50
Riders C1 and C2 Filing Placeholder ROE	12.50%
Virginia Power [Member] | Virginia Regulation [Member]
Increase Over Approved Revenue Requirement For May 1 2011 Through April 30 2012	68
Amount To Recover Projected Lost Revenues Associated With Energy Efficiency Programs	26
Virginia Powers Portion Of Mt Storm To Doubs Line Rebuild	350
Virginia Power [Member] | Virginia Regulation [Member] | Rider C1 and C2 [Member]
Proposed revenue requirement under Rider to go into effect April 1, 2011 for the rate year ending March 31, 2012	86
Virginia Regulation [Member]
Expected Cost Of Ellisburg To Craigs Project	46
Ohio Regulation [Member]
Current Annual PIR Capital Investment	120
Proposed Annual PIR Captial Investment	160
East Ohio PIR Program Revenue Requirement	$ 37