Operating Revenue (Schedule of Operating Revenue) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Electric sales:
Regulated		$ 1,716	$ 1,718	$ 3,482	$ 3,560
Nonregulated		307	335	734	724
Gas sales:
Regulated		151	26	599	91
Nonregulated		110	54	254	172
Gas transportation and storage		430	369	922	784
Other		99	96	206	188
Total operating revenue		2,813	2,598	6,197	5,519
Virginia Electric and Power Company
Electric sales:
Regulated		1,716	1,718	3,482	3,560
Gas sales:
Other		31	58	96	106
Total operating revenue	[1]	1,747	1,776	3,578	3,666
Dominion Energy Gas Holdings, LLC
Gas sales:
Regulated		15	12	47	41
Nonregulated		8	6	10	7
Gas transportation and storage		342	301	738	652
Other		57	49	117	99
Total operating revenue	[2]	$ 422	$ 368	$ 912	$ 799

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

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