Preferred Stock (Narrative) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Class of Stock [Line Items]
Preferred stock shares authorized	20,000,000
Preferred stock shares issued	0	0
Virginia Electric and Power Company
Class of Stock [Line Items]
Preferred stock shares authorized	10,000,000
Preferred stock shares issued	2,590,000	2,590,000
Preferred stock shares outstanding	2,590,000	2,590,000
Entitled Per Share Upon Liquidation	100