Operating Revenue (Operating Revenue) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012		Jun. 30, 2013	Jun. 30, 2012
Electric sales:
Regulated	$ 1,687	$ 1,725		$ 3,448	$ 3,449
Nonregulated	545	626		1,203	1,269
Gas sales:
Regulated	49	33		181	132
Nonregulated	208	165		553	563
Gas transportation and storage	360	305		827	710
Other	131	151		291	279
Total operating revenue	2,980	3,005	[1]	6,503	6,402
Virginia Electric and Power Company
Electric sales:
Regulated	1,687	1,725		3,448	3,449
Gas sales:
Other	23	31		43	61
Total operating revenue	$ 1,710	$ 1,756		$ 3,491	$ 3,510

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