Operating Segments (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total revenue from external customers		$ 2,971	$ 3,050	$ 9,127	$ 9,493
Net income attributable to Dominion		593	529	1,542	1,067
DVP
Segment Reporting Information [Line Items]
Total revenue from external customers		543	484	1,617	1,438
Dominion Generation
Segment Reporting Information [Line Items]
Total revenue from external customers		1,932	1,996	5,792	5,984
Dominion Energy
Segment Reporting Information [Line Items]
Total revenue from external customers		530	603	1,825	2,135
Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		128	144	405	432
Operating Segments | DVP
Segment Reporting Information [Line Items]
Total revenue from external customers		539	480	1,603	1,425
Net income attributable to Dominion		125	119	382	366
Operating Segments | Dominion Generation
Segment Reporting Information [Line Items]
Total revenue from external customers		1,920	1,985	5,742	5,936
Net income attributable to Dominion		391	326	923	794
Operating Segments | Dominion Energy
Segment Reporting Information [Line Items]
Total revenue from external customers		335	380	1,107	1,171
Net income attributable to Dominion		152	144	488	482
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		0	4	(9)	10
Net income attributable to Dominion		(75)	(60)	(251)	(575)
Intersegment revenue
Segment Reporting Information [Line Items]
Total revenue from external customers		(339)	(378)	(1,196)	(1,447)
Intersegment revenue | DVP
Segment Reporting Information [Line Items]
Total revenue from external customers		4	4	14	13
Intersegment revenue | Dominion Generation
Segment Reporting Information [Line Items]
Total revenue from external customers		12	11	50	48
Intersegment revenue | Dominion Energy
Segment Reporting Information [Line Items]
Total revenue from external customers		195	223	718	964
Intersegment revenue | Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		128	140	414	422
Segment Reconciling Items and Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenue from external customers		(162)	(177)	(512)	(496)
Adjustments/Eliminations
Segment Reporting Information [Line Items]
Total revenue from external customers		177	201	684	951
Net income attributable to Dominion		0	0	0	0
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Total revenue from external customers	[1]	2,058	2,053	6,008	5,765
Net income attributable to Dominion		385	314	900	707
Virginia Electric and Power Company | Operating Segments | DVP
Segment Reporting Information [Line Items]
Total revenue from external customers		541	483	1,610	1,433
Net income attributable to Dominion		125	120	382	371
Virginia Electric and Power Company | Operating Segments | Dominion Generation
Segment Reporting Information [Line Items]
Total revenue from external customers		1,523	1,570	4,419	4,332
Net income attributable to Dominion		273	248	618	570
Virginia Electric and Power Company | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		(6)	0	(21)	0
Net income attributable to Dominion		(13)	(54)	(100)	(234)
Dominion Gas Holdings, LLC
Segment Reporting Information [Line Items]
Total revenue from external customers	[2]	365	391	1,291	1,388
Net income attributable to Dominion		111	107	357	364
Dominion Gas Holdings, LLC | Operating Segments | Dominion Energy
Segment Reporting Information [Line Items]
Total revenue from external customers		365	391	1,291	1,388
Net income attributable to Dominion		113	108	364	370
Dominion Gas Holdings, LLC | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		0	0	0	0
Net income attributable to Dominion		$ (2)	$ (1)	$ (7)	$ (6)

[1] See Note 18 for amounts attributable to affiliates.

[2] See Note 18 for amounts attributable to related parties.