Significant Financing Transactions - (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	6 Months Ended		1 Months Ended			3 Months Ended	6 Months Ended						1 Months Ended						1 Months Ended
	Jan. 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Class A	Jun. 30, 2013 Class B	Jan. 31, 2013 7.83 percent Debentures due 12/01/2027	Mar. 31, 2013 Convertible Debt	Jun. 30, 2013 Convertible Debt	Jun. 30, 2013 Virginia Electric and Power Company	Jun. 30, 2012 Virginia Electric and Power Company	Jan. 31, 2013 1.2% Senior Notes That Mature In 2018 Virginia Electric and Power Company	Jan. 31, 2013 4% Senior Notes That Mature In 2043 Virginia Electric and Power Company	Mar. 31, 2013 2.75% Senior Notes that mature in 2023 Virginia Electric and Power Company	May 31, 2013 Secured Senior Note, 7.33%, due 2020 Kincaid	Mar. 31, 2013 2.5% Bonds That Mature In 2031 Virginia Electric and Power Company	Mar. 31, 2013 2.5% Bonds that Mature in 2022 Virginia Electric and Power Company	Mar. 31, 2013 2.5% Bonds that Mature in 2030 Virginia Electric and Power Company	Jun. 30, 2013 Tax Exempt Debt Brayton Point	Jun. 30, 2013 Variable Rate MDFA Solid Waste Disposal Revenue Bonds, Due2041 Virginia Electric and Power Company	Jul. 31, 2016 Minimum Scenario, Forecast	Apr. 30, 2016 Minimum Scenario, Forecast	Jul. 31, 2016 Maximum Scenario, Forecast	Apr. 30, 2016 Maximum Scenario, Forecast	Jun. 30, 2013 Common Stock [Member]
Debt Instrument [Line Items]
Credit facility									$ 120
Senior notes											250	500	500
RSN Annual Interest Rate						7.83%					1.20%	4.00%	2.75%	7.33%	2.50%	2.50%	2.50%
Amount of outstanding principal amount redeemed														145
Repayments of Long-term Debt		1,185	168						459	9				185
Outstanding principal amount																		257
Amount delivered to irrevocable trust																		284
Virginia Solid Waste and Sewage Disposal Revenue Bonds															50	10	30		75
Contingent convertible senior notes								69
Conversion rate, shares of common stock per $1,000 principal amount of senior notes (in shares)							29.6425
Principal amount of senior notes								$ 1,000
Conversion rate, shares of common stock per $1,000 principal amount of senior notes, conversion price								$ 33.74
Issuance of additional shares								800,000
Average Trading Price Principal Amount Of Senior Notes (percentage)								120.00%
Minimum Consecutive Trading Days								20 days
Maximum Consecutive Trading Days								30 days
Debt conversion converted instrument amount								13
Unsecured junior subordinated debentures						258
Number of units redeemed	250,000
Dominion Resources Capital Trust I capital securities	250
Interest rate for the Dominion Resources Capital Trust I securities	7.83%
Redemption price of the capital security	$ 1,020
Amount of Equity Units issued				$ 550	$ 550
Compounded contract adjustment payment rate				6.125%	6.00%
Interest in RSN issued by Dominion		5.00%
Purchase price to be paid under stock purchase contracts (dollars per share)																								$ 50
Shares to be issued																				8,400,000	8,400,000	9,900,000	9,900,000
Total shares reserved for issuance		22,500,000