Investments (Selected Information Regarding Marketable Equity and Debt Securities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Available-for-sale securities:
Proceeds from sales	$ 1,356,000,000		$ 1,757,000,000		$ 1,814,000,000	[1]
Realized gains	98,000,000	[2]	79,000,000	[2]	111,000,000	[2]
Realized losses	33,000,000	[2]	92,000,000	[2]	63,000,000	[2]
Proceeds from sale of investments			1,000,000,000
Virginia Electric and Power Company
Available-for-sale securities:
Proceeds from sales	626,000,000		1,030,000,000		1,192,000,000
Realized gains	42,000,000	[2]	34,000,000	[2]	52,000,000	[2]
Realized losses	$ 11,000,000	[2]	$ 34,000,000	[2]	$ 23,000,000	[2]

[1] Does not include $1 billion of proceeds reflected in Dominion's Consolidated Statement of Cash Flows from the sale of temporary investments consisting of time deposits and Treasury Bills, purchased following the sale of substantially all of Dominion's Appalachian E&P operations.

[2] Includes realized gains and losses recorded to the decommissioning trust regulatory liability as discussed in Note 2.