Operating Revenue (Operating Revenue) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Electric sales:
Regulated	$ 1,761	$ 1,724
Nonregulated	658	643
Gas sales:
Regulated	132	99
Nonregulated	345	398
Gas transportation and storage	467	405
Other	160	128
Total operating revenue	3,523	3,397	[1]
Virginia Electric and Power Company
Electric sales:
Regulated	1,761	1,724
Gas sales:
Other	20	30
Total operating revenue	$ 1,781	$ 1,754

[1] Recast to reflect Brayton Point and Kincaid as discontinued operations, as discussed in Note 3.