Long-Term Debt (Total Long Term Debt) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
2013 Weighted- average Coupon	3.30%	[1],[2]
Total principal, including VIE	$ 23,200,000,000		$ 20,842,000,000
Securities due within one year, including VIE	(1,375,000,000)	[2]	(1,519,000,000)	[2]
Unamortized discount and premium, net	(39,000,000)		(48,000,000)
Total long term debt, including VIE	21,805,000,000		19,330,000,000
Fair value hedge valuation	19,000,000	[3]	55,000,000	[3]
Unamortized premium and discount			4,000,000		14,000,000
5.25% Senior Notes Due 2033
Debt Instrument [Line Items]
Senior notes	510,000,000
RSN Annual Interest Rate	5.25%
Long term debt maturity date	2033
Redemption percentage of principal and accrued interest	100.00%
Senior Notes | Variable rates, due 2014 and 2015
Debt Instrument [Line Items]
2013 Weighted- average Coupon	0.36%	[1]
Total principal, including VIE	400,000,000		400,000,000
Senior Notes | 1.25% to 8.875%, due 2014 to 2019
Debt Instrument [Line Items]
Interest rate, minimum	1.25%
Interest rate, maximum	8.875%
2013 Weighted- average Coupon	3.17%	[1]
Total principal, including VIE	3,150,000,000		4,391,000,000
Senior Notes | 2.75% to 7.0%, due 2022 to 2044
Debt Instrument [Line Items]
Interest rate, minimum	2.75%
Interest rate, maximum	7.00%
2013 Weighted- average Coupon	4.93%	[1],[4]
Total principal, including VIE	4,449,000,000	[4]	3,499,000,000	[4]
Senior Notes | Unsecured Convertible Senior Notes, 2.125%, due 2023
Debt Instrument [Line Items]
Total principal, including VIE	0		43,000,000
RSN Annual Interest Rate	2.125%
Senior Notes | 5.0% due 2014
Debt Instrument [Line Items]
Total principal, including VIE	0	[5]	600,000,000	[5]
RSN Annual Interest Rate	5.00%
Senior Notes | 6.8% and 6.875%, due 2026 and 2027
Debt Instrument [Line Items]
Interest rate, minimum	6.80%
Interest rate, maximum	6.875%
2013 Weighted- average Coupon	6.81%	[1],[5]
Total principal, including VIE	89,000,000	[5]	89,000,000	[5]
Tax-Exempt Financings | Tax-Exempt Financing, 2.375%, due 2033
Debt Instrument [Line Items]
2013 Weighted- average Coupon	2.38%	[1]
Total principal, including VIE	27,000,000		27,000,000
RSN Annual Interest Rate	2.375%
Tax-Exempt Financings | Variable rate, due 2041
Debt Instrument [Line Items]
2013 Weighted- average Coupon	1.10%	[1]
Total principal, including VIE	75,000,000		75,000,000
Junior Subordinated Notes | Unsecured Junior Subordinated Notes Payable to Affiliated Trust, 8.4%, due 2031
Debt Instrument [Line Items]
2013 Weighted- average Coupon	8.40%	[1]
Total principal, including VIE	10,000,000		10,000,000
RSN Annual Interest Rate	8.40%
Junior Subordinated Notes | 5.75% to 8.375%, due 2054 to 2066
Debt Instrument [Line Items]
Interest rate, minimum	5.75%
Interest rate, maximum	8.375%
2013 Weighted- average Coupon	6.28%	[1]
Total principal, including VIE	985,000,000		985,000,000
Junior Subordinated Notes | Enhanced Junior Subordinated Notes, variable rate, due 2066
Debt Instrument [Line Items]
2013 Weighted- average Coupon	2.54%	[1]
Total principal, including VIE	380,000,000		380,000,000
Remarketable Subordinated Notes | Remarketable Subordinated Notes, 1.07% to 1.50%, due 2019 to 2021
Debt Instrument [Line Items]
Interest rate, minimum	1.07%
Interest rate, maximum	1.50%
2013 Weighted- average Coupon	1.30%	[1]
Total principal, including VIE	2,100,000,000		1,100,000,000
Dominion Gas Holdings, LLC
Debt Instrument [Line Items]
Total principal, including VIE	2,600,000,000		1,200,000,000
Unamortized discount and premium, net	(6,000,000)		(2,000,000)
Total long term debt, including VIE	2,594,000,000		1,198,000,000
Dominion Gas Holdings, LLC | Senior Notes | 1.05% and 2.5%, due 2016 and 2019
Debt Instrument [Line Items]
Interest rate, minimum	1.05%
Interest rate, maximum	2.50%
2013 Weighted- average Coupon	1.82%	[1]
Total principal, including VIE	850,000,000		400,000,000
Dominion Gas Holdings, LLC | Senior Notes | 3.55% to 4.8%, due 2023 to 2044
Debt Instrument [Line Items]
Interest rate, minimum	3.55%
Interest rate, maximum	4.80%
2013 Weighted- average Coupon	4.15%	[1]
Total principal, including VIE	1,750,000,000		800,000,000
Virginia Electric and Power Company
Debt Instrument [Line Items]
2013 Weighted- average Coupon	5.39%	[1]
Total principal, including VIE	8,935,000,000		8,043,000,000
Securities due within one year, including VIE	(211,000,000)		(58,000,000)
Unamortized discount and premium, net	2,000,000		(11,000,000)
Total long term debt, including VIE	8,726,000,000		7,974,000,000
Virginia Electric and Power Company | Line of Credit
Debt Instrument [Line Items]
Credit facility, to support letters of credit	120,000,000
Virginia Electric and Power Company | Senior Notes | 1.2% to 8.625%, due 2015 to 2019
Debt Instrument [Line Items]
Interest rate, minimum	1.20%
Interest rate, maximum	8.625%
2013 Weighted- average Coupon	5.06%	[1]
Total principal, including VIE	2,471,000,000		2,488,000,000
Virginia Electric and Power Company | Senior Notes | 2.75% to 8.875%, due 2022 to 2044
Debt Instrument [Line Items]
Interest rate, minimum	2.75%
Interest rate, maximum	8.875%
2013 Weighted- average Coupon	5.07%	[1]
Total principal, including VIE	5,592,000,000		4,643,000,000
Virginia Electric and Power Company | Tax-Exempt Financings | Variable rates, due 2016 to 2041
Debt Instrument [Line Items]
2013 Weighted- average Coupon	0.93%	[1],[6]
Total principal, including VIE	606,000,000	[6]	606,000,000	[6]
Virginia Electric and Power Company | Tax-Exempt Financings | 0.70% to 5.6%, due 2022 to 2040
Debt Instrument [Line Items]
Interest rate, minimum	0.70%
Interest rate, maximum	5.60%
2013 Weighted- average Coupon	2.86%	[1],[6]
Total principal, including VIE	$ 266,000,000	[6]	$ 306,000,000	[6]

[1] Represents weighted-average coupon rates for debt outstanding as of December 31, 2014.

[2] Includes $4 million fair value hedge valuation in 2014 and $14 million of fair value hedge valuation in 2013.

[3] Represents the valuation of certain fair value hedges associated with Dominion's fixed rate debt.

[4] At the option of holders, $510 million of Dominion's 5.25% senior notes due 2033 are subject to redemption at 100% of the principal amount plus accrued interest in August 2015. As a result, at December 31, 2014, the notes were included in Securities due within one year in the Consolidated Balance Sheets.

[5] Represents debt assumed by Dominion from the merger of its former CNG subsidiary.

[6] These financings relate to certain pollution control equipment at Virginia Power's generating facilities. Certain variable rate tax-exempt financings are supported by a $120 million credit facility that terminates in April 2019.