Asset Retirement Obligations (Changes to AROs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
AROs, Beginning balance	$ 1,398	[1]	$ 1,591	[1]
Obligations incurred during the period	24		16
Obligations settled during the period	(13)		(16)
Revisions in estimated cash flows	242	[2]	(277)	[3]
Accretion	77		84
Other	(23)
AROs , Ending balance	1,705	[1]	1,398	[1]
Other current liabilities	64		15		14
Virginia Electric and Power Company
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
AROs, Beginning balance	625	[4]	672	[4]
Obligations incurred during the period	18		10
Obligations settled during the period	(1)		(3)
Revisions in estimated cash flows	41	[5]	(90)	[3]
Accretion	34		36
Other	(12)
AROs , Ending balance	705		625	[4]
Asset Retirement Obligation, Current			$ 1		$ 3

[1] Includes $14 million, $15 million and $64 million reported in other current liabilities at December 31, 2010, 2011, and 2012, respectively.

[2] Primarily reflects the accelerated timing of the decommissioning of Kewaunee to begin in 2013.

[3] Primarily reflects the effect of lower anticipated costs due to the expected future recovery from the DOE of certain spent fuel storage costs.

[4] Includes $3 million and $1 million reported in other current liabilities at December 31, 2010 and 2011, respectively.

[5] Primarily reflects the effect of higher anticipated nuclear decommissioning costs.