Significant Financing Transactions - (Narrative) (Details) (USD $)	1 Months Ended	9 Months Ended		1 Months Ended			1 Months Ended			9 Months Ended						1 Months Ended									1 Months Ended
	Jan. 31, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Dominion Iroquois Inc	Jun. 30, 2013 Class A	Sep. 30, 2013 Class A	Jun. 30, 2013 Class B	Sep. 30, 2013 Class B	Jan. 31, 2013 7.83 percent Debentures due 12/01/2027	Sep. 30, 2013 Convertible Debt	Sep. 30, 2013 Virginia Electric and Power Company	Sep. 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	Sep. 30, 2013 Tax Exempt Debt Brayton Point	Sep. 30, 2013 Tax Exempt Debt Virginia Electric and Power Company	Jun. 30, 2013 Variable Rate MDFA Solid Waste Disposal Revenue Bonds, Due2041 Virginia Electric and Power Company	Aug. 31, 2013 4.65% Senior Notes due in 2043 Senior Notes	Oct. 22, 2013 Unsecured Senior Notes Senior Notes Subsequent Event	Jul. 31, 2016 Minimum Scenario, Forecast	Apr. 30, 2016 Minimum Scenario, Forecast	Jul. 31, 2016 Maximum Scenario, Forecast	Apr. 30, 2016 Maximum Scenario, Forecast	Sep. 30, 2013 Common Stock
Debt Instrument [Line Items]
Credit facility											$ 120,000,000
Variable rate tax-exempt financings																					119,000,000
Senior notes													250,000,000	500,000,000	500,000,000
RSN Annual Interest Rate									7.83%				1.20%	4.00%	2.75%	7.33%	2.50%	2.50%	2.50%				4.65%
Amount of outstanding principal amount redeemed																145,000,000
Repayments of Long-term Debt		1,214,000,000	1,037,000,000								462,000,000	10,000,000				185,000,000
Outstanding principal amount																				257,000,000
Amount delivered to irrevocable trust																				284,000,000
Virginia Solid Waste and Sewage Disposal Revenue Bonds																	50,000,000	10,000,000	30,000,000			75,000,000
Total Long-term Debt																							585,000,000	1,200,000,000
Contingent convertible senior notes										44,000,000
Conversion rate, shares of common stock per $1,000 principal amount of senior notes (in shares)										29.7664
Principal amount of senior notes										$ 1,000
Conversion rate, shares of common stock per $1,000 principal amount of senior notes, conversion price										$ 33.59
Issuance of additional shares										600,000
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										38,000,000
Unsecured junior subordinated debentures									258,000,000
Number of units redeemed	250,000
Dominion Resources Capital Trust I capital securities	250,000,000
Interest rate for the Dominion Resources Capital Trust I securities	7.83%
Redemption price of the capital security	$ 1,019.58
Amount of Equity Units issued					$ 550,000,000		$ 550,000,000
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
General partnership interest (percentage)				24.72%