Investments (Marketable Equity and Debt Securities and Cash Equivalents (Classified as Available-for-sale) and Cost Method Investments in Decommissioning Trust Funds) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Amortized Cost	$ 2,390		$ 2,340
Total Unrealized Gains	653	[1]	563	[1]
Total Unrealized Losses	(3)	[1],[2]	(6)	[1],[2]
Fair Value	3,040		2,897	[3]
Net assets related to pending sales and purchases of securities	25		43
Fair value of securities in an unrealized loss position	235		252
United States [Member] | Large Cap [Member]
Amortized Cost	1,187		1,161
Total Unrealized Gains	597	[1]	515	[1]
Total Unrealized Losses		[1]		[1]
Fair Value	1,784		1,676
United States [Member] | Other Investments [Member]
Amortized Cost	41		39
Total Unrealized Gains	11	[1]	11	[1]
Total Unrealized Losses		[1]		[1]
Fair Value	52		50
U.S. Treasury Securities and Agency Debentures [Member] | Debt Securities [Member]
Amortized Cost	499		380
Total Unrealized Gains	14	[1]	12	[1]
Total Unrealized Losses	(1)	[1]	(1)	[1]
Fair Value	512		391
Other Debt Securities [Member] | Debt Securities [Member]
Amortized Cost	22		19
Total Unrealized Gains		[1]		[1]
Total Unrealized Losses		[1]		[1]
Fair Value	22		19
State and Municipal [Member] | Debt Securities [Member]
Amortized Cost	213		244
Total Unrealized Gains	13	[1]	7	[1]
Total Unrealized Losses	(1)	[1]	(4)	[1]
Fair Value	225		247
Debt Securities [Member] | Corporate Debt Securities [Member]
Amortized Cost	274		310
Total Unrealized Gains	18	[1]	18	[1]
Total Unrealized Losses	(1)	[1]	(1)	[1]
Fair Value	291		327
Cost-method Investments [Member]
Amortized Cost	110		108
Total Unrealized Gains		[1]		[1]
Total Unrealized Losses		[1]		[1]
Fair Value	110		108
Other Investments [Member]
Amortized Cost	44	[4]	79	[4]
Total Unrealized Gains		[1],[4]		[1],[4]
Total Unrealized Losses		[1],[4]		[1],[4]
Fair Value	$ 44	[4]	$ 79	[4]

[1] Included in AOCI and the decommissioning trust regulatory liability.

[2] The fair value of securities in an unrealized loss position was $235 million and $252 million at June 30, 2011 and December 31, 2010, respectively.

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

[4] Includes pending purchases of securities of $25 million and $43 million at June 30, 2011 and December 31, 2010, respectively.