Operating Segments (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total revenue from external customers		$ 3,384	$ 2,921
Net income (loss) attributable to Dominion		632	524
DVP
Segment Reporting Information [Line Items]
Total revenue from external customers		559	561
Dominion Generation
Segment Reporting Information [Line Items]
Total revenue from external customers		1,656	1,696
Dominion Energy
Segment Reporting Information [Line Items]
Total revenue from external customers		1,167	663
Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		155	195
Operating Segments | DVP
Segment Reporting Information [Line Items]
Total revenue from external customers		554	556
Net income (loss) attributable to Dominion		125	120
Operating Segments | Dominion Generation
Segment Reporting Information [Line Items]
Total revenue from external customers		1,653	1,693
Net income (loss) attributable to Dominion		261	245
Operating Segments | Dominion Energy
Segment Reporting Information [Line Items]
Total revenue from external customers		901	485
Net income (loss) attributable to Dominion		263	186
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		3	3
Net income (loss) attributable to Dominion		(17)	(27)
Intersegment revenue
Segment Reporting Information [Line Items]
Total revenue from external customers		(426)	(378)
Intersegment revenue | DVP
Segment Reporting Information [Line Items]
Total revenue from external customers		5	5
Intersegment revenue | Dominion Generation
Segment Reporting Information [Line Items]
Total revenue from external customers		3	3
Intersegment revenue | Dominion Energy
Segment Reporting Information [Line Items]
Total revenue from external customers		266	178
Intersegment revenue | Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		152	192
Adjustments/Eliminations
Segment Reporting Information [Line Items]
Total revenue from external customers		273	184
Net income (loss) attributable to Dominion		0	0
Eliminations
Segment Reporting Information [Line Items]
Total revenue from external customers		(153)	(194)
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Total revenue from external customers	[1]	1,831	1,890
Net income (loss) attributable to Dominion		356	263
Virginia Electric and Power Company | Operating Segments | DVP
Segment Reporting Information [Line Items]
Total revenue from external customers		557	557
Net income (loss) attributable to Dominion		125	118
Virginia Electric and Power Company | Operating Segments | Dominion Generation
Segment Reporting Information [Line Items]
Total revenue from external customers		1,274	1,333
Net income (loss) attributable to Dominion		223	166
Virginia Electric and Power Company | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		0	0
Net income (loss) attributable to Dominion		8	(21)
Dominion Gas Holdings, LLC
Segment Reporting Information [Line Items]
Total revenue from external customers	[2]	490	431
Net income (loss) attributable to Dominion		108	98
Dominion Gas Holdings, LLC | Operating Segments | Dominion Energy
Segment Reporting Information [Line Items]
Total revenue from external customers		490	431
Net income (loss) attributable to Dominion		109	103
Dominion Gas Holdings, LLC | Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Total revenue from external customers		0	0
Net income (loss) attributable to Dominion		$ (1)	$ (5)

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

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