Long-Term Debt (Narrative) (Details) (USD $)	1 Months Ended		12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended						1 Months Ended					1 Months Ended									12 Months Ended					1 Months Ended
	Jan. 31, 2013	Sep. 30, 2011	Dec. 31, 2013	Sep. 30, 2013 Iroquois Gas Transmission System, L.P.	Dec. 31, 2013 Scenario, Forecast	Jul. 31, 2016 Scenario, Forecast Minimum	Apr. 30, 2016 Scenario, Forecast Minimum	Jul. 31, 2016 Scenario, Forecast Maximum	Apr. 30, 2016 Scenario, Forecast Maximum	Jun. 30, 2013 Capital Unit, Class A	Sep. 30, 2013 Capital Unit, Class A	Jun. 30, 2013 Capital Unit, Class B	Sep. 30, 2013 Capital Unit, Class B	Dec. 31, 2013 Common Stock	Jul. 01, 2006 June 2006 hybrids	Jun. 30, 2006 June 2006 hybrids	Feb. 28, 2012 September 2006 hybrids	Jun. 30, 2012 September 2006 hybrids	Mar. 31, 2012 September 2006 hybrids	Dec. 31, 2011 September 2006 hybrids	Sep. 30, 2011 September 2006 hybrids	Sep. 30, 2006 September 2006 hybrids	Jun. 30, 2010 June 2009 hybrids	Jun. 30, 2009 June 2009 hybrids	Dec. 31, 2013 Convertible Debt	Dec. 31, 2013 Enhanced Junior Subordinated Notes	Dec. 31, 2012 Enhanced Junior Subordinated Notes	Dec. 31, 2011 Enhanced Junior Subordinated Notes	Oct. 22, 2013 Senior Notes Unsecured Senior Notes	Jan. 31, 2013 7.83% Debentures due 12/1/2027	Jan. 31, 2014 Subsequent Event	Feb. 26, 2014 Subsequent Event	Feb. 28, 2014 Subsequent Event Senior Notes Senior Notes Maturing in 2024	Feb. 28, 2014 Subsequent Event Senior Notes Senior Notes Maturing in 2044
Debt Instrument [Line Items]
Outstanding contingent convertible senior notes			$ 43,000,000
Conversion rate adjustment (shares)			$ 29.8780
Principal Amount of Senior Notes																									$ 1,000
Conversion price (per share)																									$ 33.47
Shares of stock issued if all converted					600,000
Dividends declared payable (in dollars per share)																															$ 60.00
Conversion rate (shares)																																$ 29.9961
Average trading price principal amount of the senior notes			120.00%
Minimum consecutive trading days			20 days
Maximum consecutive trading days			30 days
Convertible senior notes converted by holders			39,000,000
Shares issued in excess of principal amounts related to converted securities			28,000,000
Redemption rate			100.00%
Noncontrolling interest, ownership percentage by parent			100.00%
Beneficial ownership percentage			97.00%
Beneficial ownership interest			3.00%
Percentage in capital trust assets			100.00%
Junior subordinated notes																300,000,000						500,000,000		685,000,000						258,000,000
RSN Annual Interest Rate															2.825%	7.50%					2.30%	6.30%	8.375%							7.83%			3.45%	4.45%
Redemption of units of Dominion Resources Capital Trust I capital securities	250,000
Dominion Resources Capital Trust I capital securities	250,000,000
Rate of Dominion Resources Capital Trust I capital securities	7.83%
Redemption price per capital security	$ 1,019.58
Interest charges																										1,000,000	21,000,000	21,000,000
Deferral			10 years
Period for consideration of proceeds (days)		180 days	365 days
Purchased and cancelled of junior subordinated notes																		2,000,000	86,000,000	16,000,000
Tender offer to purchase additional hybrids																	150,000,000
Equity units issued										550,000,000		550,000,000
Payment rate on Equity Units											6.125%		6.00%
Percentage interest on RSN issued by Dominion			5.00%
Purchase price to be paid under stock purchase contracts														$ 50
Shares to be issued under purchase contracts						8,400,000	8,400,000	9,900,000	9,900,000
Shares reserved and available for issuance			22,500,000
General partnership interest in Iroquois				24.72%
Total Long-term Debt																													$ 1,200,000,000.0				$ 350,000,000	$ 400,000,000