Asset Retirement Obligations (Changes to AROs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
AROs, Beginning balance	$ 1,578	[1]	$ 1,705	[1]
Obligations incurred during the period	40		13
Obligations settled during the period	(82)		(68)
Revisions in estimated cash flows	102	[2]	(129)	[3]
Accretion	81		86
Other	(5)		(29)
AROs , Ending balance	1,714	[1]	1,578	[1]
Other current liabilities	81		94		64
Virginia Electric and Power Company
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
AROs, Beginning balance	689		705
Obligations incurred during the period	28		2
Obligations settled during the period	(1)		(2)
Revisions in estimated cash flows	108	[2]	(52)	[3]
Accretion	37		38
Other	(6)		(2)
AROs , Ending balance	855	[4]	689
Virginia Electric and Power Company | Other Current Liabilities
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation	7
Dominion Gas Holdings, LLC
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
AROs, Beginning balance	137	[5],[6]	133
Obligations incurred during the period	2		8
Obligations settled during the period	(8)		(13)
Accretion	8		8
Other	8		1
AROs , Ending balance	147	[5],[6]	137	[5],[6]
Dominion Gas Holdings, LLC | Other Current Liabilities
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation	7		2
Dominion Gas Holdings, LLC | Other Deferred Credits and Other Liabilities
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation	$ 140		$ 135

[1] Includes $64 million, $94 million and $81 million reported in other current liabilities at December 31, 2012, 2013, and 2014, respectively.

[2] Relates primarily to a shift of the delayed planned date on which the DOE is expected to begin accepting spent nuclear fuel.

[3] Primarily reflects lower anticipated nuclear decommissioning costs.

[4] Includes $7 million reported in other current liabilities at December 31, 2014.

[5] Includes $2 million and $7 million reported in other current liabilities at December 31, 2013 and 2014, respectively.

[6] Includes $135 million and $140 million reported in other deferred credits and other liabilities, with the remainder recorded in other current liabilities, at December 31, 2013 and 2014, respectively.