Operating Revenue (Operating Revenue) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Electric sales:
Regulated	$ 1,951		$ 1,761
Nonregulated	854		658
Gas sales:
Regulated	147		132
Nonregulated	117		345
Gas transportation and storage	444		467
Other	117		160
Total operating revenue	3,630		3,523
Virginia Electric and Power Company
Electric sales:
Regulated	1,951		1,761
Gas sales:
Other	32		20
Total operating revenue	$ 1,983	[1]	$ 1,781	[1]

[1] See Note 17 for amounts attributable to affiliates.