Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Millstone Unit 3
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest (percentage)	93.50%	[1]
Plant in service	$ 1,104	[1]
Accumulated depreciation	(290)	[1]
Nuclear fuel	480	[1]
Accumulated amortization of nuclear fuel	(342)	[1]
Plant under construction	71	[1]
Virginia Electric and Power Company | Bath County Pumped Storage Station
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest (percentage)	60.00%	[2]
Plant in service	1,039	[2]
Accumulated depreciation	(542)	[2]
Nuclear fuel	0	[2]
Accumulated amortization of nuclear fuel	0	[2]
Plant under construction	11	[2]
Virginia Electric and Power Company | North Anna
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest (percentage)	88.40%	[2]
Plant in service	2,426	[2]
Accumulated depreciation	(1,137)	[2]
Nuclear fuel	627	[2]
Accumulated amortization of nuclear fuel	(486)	[2]
Plant under construction	114	[2]
Virginia Electric and Power Company | Clover Power Station
Jointly Owned Utility Plant Interests [Line Items]
Ownership interest (percentage)	50.00%	[2]
Plant in service	573	[2]
Accumulated depreciation	(206)	[2]
Nuclear fuel	0	[2]
Accumulated amortization of nuclear fuel	0	[2]
Plant under construction	$ 11	[2]

[1] Unit jointly owned by Dominion.

[2] Units jointly owned by Virginia Power.