Variable Interest Entities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 generator MW	Jun. 30, 2013
Virginia Electric and Power Company
Variable Interest Entities [Line Items]
Long term capacity contract non utility generators (generators)			4
Aggregate generation capacity from long-term power and capacity contracts (MW)			870
Remaining purchase commitments			$ 807
Payment for electric capacity	55	53	111	108
Payment for electric energy	33	26	87	46
Shared services purchased	106	83	214	160
Virginia Electric and Power Company | Minimum
Variable Interest Entities [Line Items]
Contracts expiry date start range			2015
Virginia Electric and Power Company | Maximum
Variable Interest Entities [Line Items]
Contracts expiry date start range			2021
Dominion Gas Holdings, LLC
Variable Interest Entities [Line Items]
Shared services purchased	$ 26	$ 25	$ 52	$ 51