Preferred Stock (Narrative) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015
Class of Stock [Line Items]
Preferred stock shares authorized		20,000,000
Preferred stock shares issued	0	0
Preferred stock shares outstanding	0	0
Virginia Electric and Power Company
Class of Stock [Line Items]
Preferred stock shares authorized		10,000,000
Amount each share is entitled to receive		$ 100
Amount of all outstanding series of preferred stock redeemed	2,590,000