Operating Revenue (Operating Revenue) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012		Sep. 30, 2013	Sep. 30, 2012
Electric sales:
Regulated	$ 2,023	$ 2,046		$ 5,471	$ 5,495
Nonregulated	704	661		1,907	1,930
Gas sales:
Regulated	32	34		213	166
Nonregulated	159	177		712	740
Gas transportation and storage	329	297		1,156	1,007
Other	185	117		476	396
Total operating revenue	3,432	3,332	[1]	9,935	9,734	[2]
Virginia Electric and Power Company
Electric sales:
Regulated	2,023	2,046		5,471	5,495
Gas sales:
Other	36	40		79	101
Total operating revenue	$ 2,059	$ 2,086		$ 5,550	$ 5,596

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

[2] Net of $43 million and $57 million tax for the three months ended September 30, 2013 and 2012, respectively, and net of $21 million and $(28) million tax for the nine months ended September 30, 2013 and 2012, respectively.