Operating Revenue (Schedule of Operating Revenue) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Electric sales:
Regulated		$ 2,147	$ 2,020	$ 5,707	$ 5,911
Nonregulated		399	388	1,123	1,145
Gas sales:
Regulated		46	21	137	168
Nonregulated		87	66	259	361
Gas transportation and storage		378	365	1,162	1,221
Other		75	111	263	321
Total operating revenue		3,132	2,971	8,651	9,127
Virginia Electric and Power Company
Electric sales:
Regulated		2,147	2,020	5,707	5,911
Gas sales:
Other		64	38	170	97
Total operating revenue	[1]	2,211	2,058	5,877	6,008
Dominion Gas Holdings, LLC
Gas sales:
Regulated		28	9	69	87
Nonregulated		1	1	8	5
Gas transportation and storage		303	302	955	1,035
NGL revenue		19	20	45	71
Other		31	33	104	93
Total operating revenue	[2]	$ 382	$ 365	$ 1,181	$ 1,291

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

[2] See Note 17 for amounts attributable to related parties.