Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Details) (USD $) In Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2011		Dec. 31, 2010
Junior subordinated notes payable to affiliates	$ 268		$ 268	[1]
Enhanced junior subordinated notes	1,467		1,467	[1]
Subsidiary preferred stock	257		257	[1]
Valuation of certain fair value hedges	103		49
Issuance expenses of subsidiary preferred stock	2		2
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Long-term debt, including securities due within one year	16,745	[2]	14,520	[2]
Junior subordinated notes payable to affiliates	268		268
Enhanced junior subordinated notes	1,467		1,467
Subsidiary preferred stock	257	[3]	257	[3]
Estimate of Fair Value, Fair Value Disclosure [Member]
Long-term debt, including securities due within one year	19,381	[2],[4]	16,112	[2],[4]
Junior subordinated notes payable to affiliates	275	[4]	261	[4]
Enhanced junior subordinated notes	1,539	[4]	1,560	[4]
Subsidiary preferred stock	$ 262	[3],[4]	$ 249	[3],[4]

[1] Dominion’s Consolidated Balance Sheet at December 31, 2010 has been derived from the audited Consolidated Financial Statements at that date.

[2] Includes amounts which represent the unamortized discount and premium. At September 30, 2011 and December 31, 2010, includes the valuation of certain fair value hedges associated with Dominion’s fixed rate debt of approximately $103 million and $49 million, respectively

[3] Includes issuance expenses of $2 million at September 30, 2011 and December 31, 2010.

[4] Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. 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