Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	$ 3,044	$ 3,086
Asset disposition adjustment			(42)
DCG acquisition		250
Goodwill, Ending Balance	[1]	3,294	3,044
Operating Segments | Dominion Generation
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1],[2]	1,422	1,454
Asset disposition adjustment	[3]		(32)
DCG acquisition	[2]	0
Goodwill, Ending Balance	[1]	1,422	1,422	[2]
Operating Segments | Dominion Energy
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1],[2]	696	706
Asset disposition adjustment	[4]		(10)
DCG acquisition		250
Goodwill, Ending Balance	[1]	946	696	[2]
Operating Segments | DVP
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	926	926
Asset disposition adjustment			0
DCG acquisition		0
Goodwill, Ending Balance	[1]	926	926
Operating Segments | Corporate and Other
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1],[5]	0	0
Asset disposition adjustment	[5]		0
DCG acquisition	[5]	0
Goodwill, Ending Balance	[1],[5]	0	0
Dominion Gas Holdings, LLC
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	542	545
Asset disposition adjustment			(3)
No events affecting goodwill		0
Goodwill, Ending Balance	[1]	542	542
Dominion Gas Holdings, LLC | Operating Segments | Dominion Generation
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	0	0
Asset disposition adjustment			0
No events affecting goodwill		0
Goodwill, Ending Balance	[1]	0	0
Dominion Gas Holdings, LLC | Operating Segments | Dominion Energy
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	542	545
Asset disposition adjustment	[4]		(3)
No events affecting goodwill		0
Goodwill, Ending Balance	[1]	542	542
Dominion Gas Holdings, LLC | Operating Segments | DVP
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1]	0	0
Asset disposition adjustment			0
No events affecting goodwill		0
Goodwill, Ending Balance	[1]	0	0
Dominion Gas Holdings, LLC | Operating Segments | Corporate and Other
Goodwill [Roll Forward]
Goodwill, Beginning Balance	[1],[5]	0	0
Asset disposition adjustment	[5]		0
No events affecting goodwill	[5]	0
Goodwill, Ending Balance	[1],[5]	$ 0	$ 0

[1] Goodwill amounts do not contain any accumulated impairment losses.

[2] Recast to reflect nonregulated retail energy marketing operations in the Dominion Energy segment.

[3] See Note 3 for a discussion of Dominion's dispositions and related goodwill write-offs.

[4] Related to assets sold or contributed to an affiliate or Blue Racer.

[5] Goodwill recorded at the Corporate and Other segment is allocated to the primary operating segments for goodwill impairment testing purposes.