Operating Revenue (Operating Revenue) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012		Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Electric sales:
Regulated											$ 7,102	$ 7,114		$ 7,123
Nonregulated											2,742	3,100		3,559
Gas sales:
Regulated											250	287		308
Nonregulated											1,071	1,635		2,010
Gas transportation and storage											1,401	1,506		1,493
Other											527	503		434
Total operating revenue	3,167	3,411	3,053	3,462	[1]	3,129	3,745	3,288	3,983	[1]	13,093	14,145	[2]	14,927	[2]
Virginia Electric and Power Company
Electric sales:
Regulated											7,102	7,114		7,123
Gas sales:
Other											124	132		96
Total operating revenue	$ 1,630	$ 2,086	$ 1,756	$ 1,754		$ 1,555	$ 2,177	$ 1,757	$ 1,757		$ 7,226	$ 7,246		$ 7,219

[1] Revenue and income amounts have been recast to reflect Salem Harbor and State Line as discontinued operations, as discussed in Note 3.

[2] Recast to reflect Salem Harbor and State Line as discontinued operations as described in Note 3 to the Consolidated Financial Statements. EPS amounts reflect the per share impact of the recast.