Operating Segments (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Total revenue from external customers		$ 3,132	$ 2,971	$ 8,651	$ 9,127
Net income (loss) attributable to Dominion		690	593	1,666	1,542
DVP
Segment Reporting Information [Line Items]
Total revenue from external customers		620	543	1,699	1,617
Dominion Generation
Segment Reporting Information [Line Items]
Total revenue from external customers	[1]	1,949	1,894	5,211	5,544
Dominion Energy
Segment Reporting Information [Line Items]
Total revenue from external customers	[1]	564	536	1,742	1,960
Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		146	128	477	405
Operating Segments | DVP
Segment Reporting Information [Line Items]
Total revenue from external customers		614	539	1,682	1,603
Net income (loss) attributable to Dominion		139	125	363	382
Operating Segments | Dominion Generation
Segment Reporting Information [Line Items]
Total revenue from external customers	[1]	1,947	1,892	5,204	5,533
Net income (loss) attributable to Dominion	[1]	650	390	1,066	902
Operating Segments | Dominion Energy
Segment Reporting Information [Line Items]
Total revenue from external customers	[1]	359	377	1,235	1,376
Net income (loss) attributable to Dominion	[1]	135	153	483	509
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		2	0	8	(9)
Net income (loss) attributable to Dominion		(234)	(75)	(246)	(251)
Intersegment revenue
Segment Reporting Information [Line Items]
Total revenue from external customers	[1]	(357)	(293)	(1,000)	(1,023)
Intersegment revenue | DVP
Segment Reporting Information [Line Items]
Total revenue from external customers		6	4	17	14
Intersegment revenue | Dominion Generation
Segment Reporting Information [Line Items]
Total revenue from external customers	[1]	2	2	7	11
Intersegment revenue | Dominion Energy
Segment Reporting Information [Line Items]
Total revenue from external customers	[1]	205	159	507	584
Intersegment revenue | Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		144	128	469	414
Adjustments/Eliminations
Segment Reporting Information [Line Items]
Total revenue from external customers	[1]	210	163	522	624
Net income (loss) attributable to Dominion	[1]	0	0	0	0
Eliminations
Segment Reporting Information [Line Items]
Total revenue from external customers	[1]	(147)	(130)	(478)	(399)
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Total revenue from external customers	[2]	2,211	2,058	5,877	6,008
Net income (loss) attributable to Dominion		503	385	1,046	900
Virginia Electric and Power Company | Operating Segments | DVP
Segment Reporting Information [Line Items]
Total revenue from external customers		617	541	1,686	1,610
Net income (loss) attributable to Dominion		140	125	362	382
Virginia Electric and Power Company | Operating Segments | Dominion Generation
Segment Reporting Information [Line Items]
Total revenue from external customers		1,594	1,523	4,191	4,419
Net income (loss) attributable to Dominion		359	273	699	618
Virginia Electric and Power Company | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		0	(6)	0	(21)
Net income (loss) attributable to Dominion		4	(13)	(15)	(100)
Dominion Gas Holdings, LLC
Segment Reporting Information [Line Items]
Total revenue from external customers	[3]	382	365	1,181	1,291
Net income (loss) attributable to Dominion		83	111	286	357
Dominion Gas Holdings, LLC | Operating Segments | Dominion Energy
Segment Reporting Information [Line Items]
Total revenue from external customers		382	365	1,181	1,291
Net income (loss) attributable to Dominion		77	113	288	364
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 (loss) attributable to Dominion		$ 6	$ (2)	$ (2)	$ (7)

[1] 2015 amounts have been recast to reflect nonregulated retail energy marketing operations in the Dominion Energy segment.

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

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