Income Taxes (Earliest Tax Year) (Details)	12 Months Ended
	Dec. 31, 2013
Pennsylvania
Operation In Major Geographical Areas Tax Year [Line Items]
Earliest Open Tax Year	2010
Connecticut
Operation In Major Geographical Areas Tax Year [Line Items]
Earliest Open Tax Year	2010
Massachusetts
Operation In Major Geographical Areas Tax Year [Line Items]
Earliest Open Tax Year	2008
Virginia
Operation In Major Geographical Areas Tax Year [Line Items]
Earliest Open Tax Year	2010	[1]
West Virginia
Operation In Major Geographical Areas Tax Year [Line Items]
Earliest Open Tax Year	2010

[1] Virginia is the only state considered major for Virginia Power's operations.