Operating Segment (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating Revenue	$ 3,086	$ 3,132	$ 2,598	$ 2,921	$ 2,556	$ 2,971	$ 2,747	$ 3,409	$ 11,737		$ 11,683		$ 12,436
Equity in earnings of equity method investees									111		56		46
Income tax expense									655		905		452
Net income (loss) attributable to Dominion	457	690	452	524	357	593	413	536	2,123		1,899		1,310
Capital expenditures									6,085		5,575		5,345
Investment in equity method affiliates	1,561				1,320				1,561		1,320
Total assets	71,610				58,648				71,610		58,648
Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue									11,737		11,683		12,436
Depreciation, depletion and amortization									1,559		1,395		1,292
Equity in earnings of equity method investees									111		56		46
Interest income									66		58		68
Interest and related charges									1,010		904		1,193
Income tax expense									655		905		452
Net income (loss) attributable to Dominion									2,123		1,899		1,310
Capital expenditures									6,125		5,993		5,551
Investment in equity method affiliates	1,561				1,320				1,561		1,320
Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue									(1,339)		(1,284)		(1,504)
Adjustments & Eliminations
Segment Reporting Information [Line Items]
Operating Revenue									718		741		949
Depreciation, depletion and amortization									0		0		0
Equity in earnings of equity method investees									0		0		0
Interest income									(78)		(44)		(33)
Interest and related charges									(78)		(44)		(33)
Income tax expense									0		0		0
Net income (loss) attributable to Dominion									0		0		0
Capital expenditures									0		0		0
Investment in equity method affiliates	0				0				0		0
Total assets	(7,300)				(5,800)				(7,300)		(5,800)
Segment Reconciling Items and Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating Revenue									(621)		(543)		(555)
DVP
Segment Reporting Information [Line Items]
Operating Revenue									2,233		2,111		1,936
DVP | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue									2,210		2,091		1,918
Depreciation, depletion and amortization									537		498		462
Equity in earnings of equity method investees									0		0		0
Interest income									0		0		0
Interest and related charges									244		230		205
Income tax expense									308		307		317
Net income (loss) attributable to Dominion									484		490		502
Capital expenditures									1,320		1,607		1,652
Investment in equity method affiliates	0				0				0		0
Total assets	15,600				14,700				15,600		14,700
DVP | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue									23		20		18
Dominion Generation
Segment Reporting Information [Line Items]
Operating Revenue									6,757		7,016		7,169
Dominion Generation | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue									6,747		7,001		7,135
Depreciation, depletion and amortization									662		591		514
Equity in earnings of equity method investees									(16)		(15)		(18)
Interest income									74		64		58
Interest and related charges									290		262		240
Income tax expense									279		465		365
Net income (loss) attributable to Dominion									1,397		1,120		1,061
Capital expenditures									2,440		2,190		2,466
Investment in equity method affiliates	228				245				228		245
Total assets	27,100				25,600				27,100		25,600
Dominion Generation | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue									10		15		34
Dominion Energy
Segment Reporting Information [Line Items]
Operating Revenue									2,766		2,572		3,326
Dominion Energy | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue									2,069		1,877		2,446
Depreciation, depletion and amortization									330		262		243
Equity in earnings of equity method investees									105		60		54
Interest income									34		25		23
Interest and related charges									38		27		11
Income tax expense									431		423		463
Net income (loss) attributable to Dominion									726		680		717
Capital expenditures									2,322		2,153		1,329
Investment in equity method affiliates	1,289				1,042				1,289		1,042
Total assets	26,000				15,200				26,000		15,200
Dominion Energy | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue									697		695		880
Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenue									602		527		560
Corporate and Other | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue									(7)		(27)		(12)
Depreciation, depletion and amortization									30		44		73
Equity in earnings of equity method investees									22		11		10
Interest income									36		13		20
Interest and related charges									516		429		770
Income tax expense									(363)		(290)		(693)
Net income (loss) attributable to Dominion									(484)		(391)		(970)
Capital expenditures									43		43		104
Investment in equity method affiliates	44				33				44		33
Total assets	10,200				8,900				10,200		8,900
Corporate and Other | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue									609		554		572
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue	1,711	2,211	1,776	1,890	1,614	2,058	1,813	2,137	7,588	[1]	7,622	[1]	7,579	[1]
Depreciation, depletion and amortization									1,025		953		915
Interest income									0		7		8
Interest and related charges									461		443		411
Income tax expense									727		659		548
Net income (loss) attributable to Dominion	172	503	280	263	187	385	246	269	1,218		1,087		858
Capital expenditures									2,489		2,474		2,911
Capital expenditures									2,649		2,689		3,107
Total assets	33,308				31,565				33,308		31,565
Virginia Electric and Power Company | Adjustments & Eliminations
Segment Reporting Information [Line Items]
Operating Revenue									0		0		0
Depreciation, depletion and amortization									0		0		0
Interest income									0		0		0
Interest and related charges									(2)		(1)		0
Income tax expense													0
Net income (loss) attributable to Dominion									0		0		0
Capital expenditures									0		0		0
Total assets	(100)				(100)				(100)		(100)
Virginia Electric and Power Company | DVP | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue									2,217		2,099		1,928
Depreciation, depletion and amortization									537		498		462
Interest income									0		0		0
Interest and related charges									244		230		205
Income tax expense									307		308		317
Net income (loss) attributable to Dominion									482		490		509
Capital expenditures									1,313		1,569		1,651
Total assets	15,600				14,700				15,600		14,700
Virginia Electric and Power Company | Dominion Generation | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue									5,390		5,566		5,651
Depreciation, depletion and amortization									488		453		416
Interest income									0		7		8
Interest and related charges									219		210		203
Income tax expense									524		437		416
Net income (loss) attributable to Dominion									909		750		691
Capital expenditures									1,336		1,120		1,456
Total assets	17,800				17,000				17,800		17,000
Virginia Electric and Power Company | Corporate and Other | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue									(19)		(43)		0
Depreciation, depletion and amortization									0		2		37
Interest income									0		0		0
Interest and related charges									0		4		3
Income tax expense									(104)		(86)		(185)
Net income (loss) attributable to Dominion									(173)		(153)		(342)
Capital expenditures									0		0		0
Total assets	0				0				0		0
Dominion Gas Holdings, LLC
Segment Reporting Information [Line Items]
Operating Revenue	457	382	368	431	425	365	395	531	1,638	[2]	1,716	[2]	1,898	[2]
Depreciation, depletion and amortization									204		217		197
Equity in earnings of equity method investees									21		23		21
Interest income									1		1		1
Interest and related charges									94		73		27
Income tax expense									215		283		334
Net income (loss) attributable to Dominion	106	$ 83	$ 105	$ 98	100	$ 111	$ 85	$ 161	392		457		512
Capital expenditures									854		795		719
Investment in equity method affiliates	98				102				98		102
Total assets	11,142				10,308				11,142		10,308
Dominion Gas Holdings, LLC | Dominion Energy | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue									1,638		1,716		1,898
Depreciation, depletion and amortization									214		213		197
Equity in earnings of equity method investees									21		23		21
Interest income									1		1		1
Interest and related charges									92		72		27
Income tax expense									237		296		340
Net income (loss) attributable to Dominion									395		478		521
Capital expenditures									854		795		719
Investment in equity method affiliates	98				102				98		102
Total assets	10,500				9,700				10,500		9,700
Dominion Gas Holdings, LLC | Corporate and Other | Operating Segments
Segment Reporting Information [Line Items]
Operating Revenue									0		0		0
Depreciation, depletion and amortization									(10)		4		0
Equity in earnings of equity method investees									0		0		0
Interest income									0		0		0
Interest and related charges									2		1		0
Income tax expense									(22)		(13)		(6)
Net income (loss) attributable to Dominion									(3)		(21)		(9)
Capital expenditures									0		0		$ 0
Investment in equity method affiliates	0				0				0		0
Total assets	$ 600				$ 600				$ 600		$ 600

[1] See Note 24 for amounts attributable to affiliates.

[2] See Note 24 for amounts attributable to related parties.