Property, Plant and Equipment (Share of Jointly-Owned Power Stations) (Details) (Dominion [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Bath County Pumped Storage Station [Member]
Ownership interest	60.00%	[1]
Plant in service	$ 1,023	[1]
Accumulated depreciation	(497)	[1]
Nuclear fuel	0	[1]
Accumulated amortization of nuclear fuel	0	[1]
Plant under construction	12	[1]
North Anna Power Station [Member]
Ownership interest	88.40%	[1]
Plant in service	2,332	[1]
Accumulated depreciation	(1,086)	[1]
Nuclear fuel	512	[1]
Accumulated amortization of nuclear fuel	(383)	[1]
Plant under construction	447	[1]
Clover Power Station [Member]
Ownership interest	50.00%	[1]
Plant in service	564	[1]
Accumulated depreciation	(185)	[1]
Nuclear fuel	0	[1]
Accumulated amortization of nuclear fuel	0	[1]
Plant under construction	8	[1]
Millstone Unit 3 [Member]
Ownership interest	93.50%	[2]
Plant in service	989	[2]
Accumulated depreciation	(210)	[2]
Nuclear fuel	401	[2]
Accumulated amortization of nuclear fuel	(254)	[2]
Plant under construction	$ 36	[2]

[1] Units jointly owned by Virginia Power.

[2] Unit jointly owned by Dominion.