Goodwill and Intangible Assets (Components of Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 887	$ 870
Accumulated Amortization	317	310
Virginia Electric and Power Company
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	286	271
Accumulated Amortization	81	78
Dominion Gas Holdings, LLC
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	192	180
Accumulated Amortization	113	98
Software, licenses and other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	877	867
Accumulated Amortization	312	308
Software, licenses and other | Virginia Electric and Power Company
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	286	271
Accumulated Amortization	81	78
Software, licenses and other | Dominion Gas Holdings, LLC
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	192	180
Accumulated Amortization	113	98
Emissions allowances
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10	3
Accumulated Amortization	$ 5	$ 2