Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013		Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Junior subordinated notes	$ 1,373		$ 1,373	[1]
Subsidiary preferred stock	257		257	[1]
Valuation of certain fair value hedges	56		93
Issuance expenses of subsidiary preferred stock	2		2
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Long-term Debt	17,228	[2]	16,841	[2]
Securities due within one year, VIE	0	[3]	860	[3]
Junior subordinated notes	1,373	[3]	1,373	[3]
Remarketable subordinated notes	1,079	[3]	0	[3]
Subsidiary preferred stock	257	[4]	257	[4]
Estimate of Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Long-term Debt	18,899	[2],[5]	19,898	[2],[5]
Securities due within one year, VIE	0	[3],[5]	864	[3],[5]
Junior subordinated notes	1,397	[3],[5]	1,430	[3],[5]
Remarketable subordinated notes	1,175	[3],[5]	0	[3],[5]
Subsidiary preferred stock	258	[4],[5]	255	[4],[5]
Virginia Electric and Power Company
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Subsidiary preferred stock	257		257	[6]
Virginia Electric and Power Company | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Long-term Debt	8,039	[2]	6,669	[2]
Subsidiary preferred stock	257	[4]	257	[4]
Virginia Electric and Power Company | Estimate of Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Long-term Debt	8,975	[2],[5]	8,270	[2],[5]
Subsidiary preferred stock	$ 258	[4],[5]	$ 255	[4],[5]

[1] Dominion’s Consolidated Balance Sheet at December 31, 2012 has been derived from the audited Consolidated Financial Statements at that date.

[2] Carrying amount includes amounts which represent the unamortized discount and premium. At September 30, 2013 and December 31, 2012, includes the valuation of certain fair value hedges associated with Dominion’s fixed rate debt of approximately $56 million and $93 million, respectively.

[3] Carrying amount includes amounts which represent the unamortized discount or premium.

[4] Carrying amount includes deferred issuance expenses of $2 million at September 30, 2013 and December 31, 2012.

[5] Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issues with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.

[6] Virginia Power’s Consolidated Balance Sheet at December 31, 2012 has been derived from the audited Consolidated Financial Statements at that date.