Significant Financing Transactions - (Narrative) (Details) (USD $)			9 Months Ended	1 Months Ended			1 Months Ended																	0 Months Ended												1 Months Ended
	Sep. 30, 2014 Facility	Jul. 01, 2014	Sep. 30, 2014 Convertible Debt	Jul. 31, 2017 Scenario, Forecast Minimum	Jul. 31, 2017 Scenario, Forecast Maximum	Jul. 01, 2014 Common Stock	Jul. 31, 2014 Capital Unit, Class A	Jul. 01, 2014 Capital Unit, Class A	Sep. 30, 2014 Credit Facility 4 Billion		May 31, 2014 Credit Facility 4 Billion		May 01, 2014 Credit Facility 4 Billion		Sep. 30, 2014 Credit Facility 500 Million		Feb. 28, 2014 Senior Notes Maturing in 2024 Senior Notes	Feb. 28, 2014 Senior Notes Maturing in 2044 Senior Notes	Oct. 31, 2014 Senior Notes Maturing in 2044 Senior Notes Subsequent Event	Mar. 31, 2014 Senior Notes Maturing in 2017 Senior Notes	Apr. 30, 2014 Utility Tax Exempt Loan, 2.5%, due 2022 Solid Waste and Sewage Disposal Revenue Bonds	Apr. 30, 2014 Utility Tax Exempt Loan, 2.5%, due 2030 Solid Waste and Sewage Disposal Revenue Bonds	Oct. 31, 2014 Enhanced Junior Subordinated Notes, 5.75% Junior Subordinated Debt Subsequent Event	Oct. 01, 2024 Enhanced Junior Subordinated Notes, 5.75% LIBOR Scenario, Forecast Junior Subordinated Debt Subsequent Event	Sep. 30, 2014 June 2009 hybrids	Sep. 30, 2014 Virginia Electric and Power Company	Sep. 30, 2014 Virginia Electric and Power Company Tax Exempt Debt	Sep. 30, 2014 Virginia Electric and Power Company Credit Facility 4 Billion		Jul. 31, 2014 Virginia Electric and Power Company Credit Facility 4 Billion		Jul. 01, 2014 Virginia Electric and Power Company Credit Facility 4 Billion		Sep. 30, 2014 Virginia Electric and Power Company Credit Facility 500 Million		Jun. 30, 2014 Dominion Gas Holdings, LLC Senior Notes	Sep. 30, 2014 Dominion Gas Holdings, LLC Credit Facility 4 Billion		Sep. 30, 2014 Dominion Gas Holdings, LLC Credit Facility 500 Million
Debt Instrument [Line Items]
Credit facility																										$ 120,000,000
Variable rate tax-exempt financings																											119,000,000
Number of joint revolving credit facilities	2
Facility Limit	4,500,000,000								4,000,000,000	[1]	4,000,000,000	[1]	3,000,000,000	[1]	500,000,000	[2]										1,500,000,000		1,250,000,000	[3]	1,250,000,000.00	[1]	1,000,000,000.0	[1]	250,000,000	[4]		1,000,000,000	[1]
Credit Facility, to support letters of credit									1,500,000,000.0																			1,500,000,000.0									500,000,000	[1]	0	[2]
Long term debt amount																	350,000,000	400,000,000	200,000,000	400,000,000	10,000,000	30,000,000	685,000,000		685,000,000
Annual Interest Rate (percent)																	3.45%	4.45%	4.45%	1.25%	2.50%	2.50%	5.75%		8.375%
Principal amount of unsecured senior notes																																				1,200,000,000
Basis spread on variable rate																								3.057%
Contingent convertible senior notes			22,000,000
Conversion rate, shares of common stock per $1,000 principal amount of senior notes (in shares)			30.2397
Principal amount of senior notes			$ 1,000
Conversion rate, shares of common stock per $1,000 principal amount of senior notes, conversion price			$ 33.07
Issuance of additional shares			340,000
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			21,000,000
Amount of common stock			23,000,000
Amount of Equity Units issued							$ 1,000,000,000
Payment rate for Equity Units								6.375%
Percentage interest in RSN issued		5.00%
Purchase price per unit						$ 50
Shares to be issued under terms of stock purchase contracts				11,500,000	14,300,000
Common stock reserved for issuance in connection with stock purchase contracts		17,750,000

[1] In May 2014, this credit facility was amended and restated. The facility limit was increased from $3 billion to $4 billion and the maturity date was extended from September 2018 to April 2019. This credit facility can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion of letters of credit.

[2] In May 2014, this credit facility was amended and restated and the maturity date was extended from September 2018 to April 2019. This credit facility can be used to support bank borrowings, commercial paper and letter of credit issuances.

[3] In May 2014, this credit facility was amended and restated and the maturity date was extended from September 2018 to April 2019. This credit facility can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit. Virginia Power's current sub-limit under this credit facility can be increased or decreased multiple times per year. In July 2014, Virginia Power increased its sub-limit from $1.0 billion to $1.25 billion.

[4] In May 2014, this credit facility was amended and restated and the maturity date was extended from September 2018 to April 2019. This credit facility can be used to support bank borrowings, commercial paper and letter of credit issuances. Virginia Power's current sub-limit under this credit facility can be increased or decreased multiple times per year.