Operating Revenue (Operating Revenue) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Electric sales:
Regulated	$ 1,725	$ 1,728		$ 3,449		$ 3,458
Nonregulated	675	741		1,383		1,608
Gas sales:
Regulated	33	44		132		183
Nonregulated	165	337		563		939
Gas transportation and storage	305	322		710		860
Other	150	116		278		223
Total operating revenue	3,053	3,288	[1]	6,515	[1]	7,271	[1]
Virginia Electric and Power Company
Electric sales:
Regulated	1,725	1,728		3,449		3,458
Gas sales:
Other	31	29		61		56
Total operating revenue	$ 1,756	$ 1,757		$ 3,510		$ 3,514

[1] Consolidated Statements of Income for the six months ended June 30, 2012 and the three and six months ended June 30, 2011 have been recast to reflect Salem Harbor and State Line as discontinued operations, as discussed in Note 3.