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, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Investment Holdings [Line Items]
Amortized Cost, Total	$ 2,717		$ 2,669
Total Unrealized Gains	1,260	[1]	1,252	[1]
Total Unrealized Losses	(8)	[1],[2]	(18)	[1],[2]
Fair Value	3,969		3,903	[3]
Net assets related to pending sales and purchases of securities	13		11
Fair Value of securities in an unrealized loss position	475		604
Cost method investments
Investment Holdings [Line Items]
Amortized Cost, Other Investments	99		106
Total Unrealized Gains	0	[1]	0	[1]
Total Unrealized Losses	0	[1]	0	[1]
Fair Value	99		106
Cash Equivalents and Other Investment
Investment Holdings [Line Items]
Amortized Cost, Other Investments	105	[4]	110	[4]
Total Unrealized Gains	0	[1],[4]	0	[1],[4]
Total Unrealized Losses	0	[1],[4]	0	[1],[4]
Fair Value	105	[4]	110	[4]
Equity Securities | U.S. Large Cap | United States
Investment Holdings [Line Items]
Amortized Cost, Marketable Securities	1,214		1,183
Total Unrealized Gains	1,219	[1]	1,194	[1]
Total Unrealized Losses	0	[1]	0	[1]
Fair Value	2,433		2,377
Equity Securities | Other | United States
Investment Holdings [Line Items]
Amortized Cost, Marketable Securities			49
Total Unrealized Gains			23	[1]
Total Unrealized Losses			0	[1]
Fair Value			72
Corporate bonds
Investment Holdings [Line Items]
Amortized Cost, Marketable Securities	375		332
Total Unrealized Gains	17	[1]	16	[1]
Total Unrealized Losses	(1)	[1]	(3)	[1]
Fair Value	391		345
U.S. Treasury securities and agency debentures
Investment Holdings [Line Items]
Amortized Cost, Marketable Securities	612		589
Total Unrealized Gains	8	[1]	8	[1]
Total Unrealized Losses	(6)	[1]	(10)	[1]
Fair Value	614		587
State and municipal
Investment Holdings [Line Items]
Amortized Cost, Marketable Securities	305		297
Total Unrealized Gains	16	[1]	11	[1]
Total Unrealized Losses	(1)	[1]	(5)	[1]
Fair Value	320		303
Other
Investment Holdings [Line Items]
Amortized Cost, Marketable Securities	7		3
Total Unrealized Gains	0	[1]	0	[1]
Total Unrealized Losses	0	[1]	0	[1]
Fair Value	7		3
Virginia Electric and Power Company
Investment Holdings [Line Items]
Amortized Cost, Total	1,259		1,236
Total Unrealized Gains	541	[1]	538	[1]
Total Unrealized Losses	(4)	[1],[5]	(9)	[1],[5]
Fair Value	1,796		1,765	[6]
Net assets related to pending sales and purchases of securities	15		6
Fair Value of securities in an unrealized loss position	211		299
Virginia Electric and Power Company | Cost method investments
Investment Holdings [Line Items]
Amortized Cost, Other Investments	99		106
Total Unrealized Gains	0	[1]	0	[1]
Total Unrealized Losses	0	[1]	0	[1]
Fair Value	99		106
Virginia Electric and Power Company | Cash Equivalents and Other Investment
Investment Holdings [Line Items]
Amortized Cost, Other Investments	34	[7]	37	[7]
Total Unrealized Gains	0	[1],[7]	0	[1],[7]
Total Unrealized Losses	0	[1],[7]	0	[1],[7]
Fair Value	34	[7]	37	[7]
Virginia Electric and Power Company | Equity Securities | U.S. Large Cap | United States
Investment Holdings [Line Items]
Amortized Cost, Marketable Securities	522		506
Total Unrealized Gains	523	[1]	514	[1]
Total Unrealized Losses	0	[1]	0
Fair Value	1,045		1,020
Virginia Electric and Power Company | Equity Securities | Other | United States
Investment Holdings [Line Items]
Amortized Cost, Marketable Securities			25
Total Unrealized Gains			11	[1]
Total Unrealized Losses			0	[1]
Fair Value			36
Virginia Electric and Power Company | Corporate bonds
Investment Holdings [Line Items]
Amortized Cost, Marketable Securities	211		185
Total Unrealized Gains	9	[1]	8	[1]
Total Unrealized Losses	(1)	[1]	(2)	[1]
Fair Value	219		191
Virginia Electric and Power Company | U.S. Treasury securities and agency debentures
Investment Holdings [Line Items]
Amortized Cost, Marketable Securities	217		214
Total Unrealized Gains	2	[1]	1	[1]
Total Unrealized Losses	(2)	[1]	(3)	[1]
Fair Value	217		212
Virginia Electric and Power Company | State and municipal
Investment Holdings [Line Items]
Amortized Cost, Marketable Securities	175		163
Total Unrealized Gains	7	[1]	4	[1]
Total Unrealized Losses	(1)	[1]	(4)	[1]
Fair Value	181		163
Virginia Electric and Power Company | Other
Investment Holdings [Line Items]
Amortized Cost, Marketable Securities	1
Total Unrealized Gains	0	[1]
Total Unrealized Losses	0	[1]
Fair Value	$ 1

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

[2] The fair value of securities in an unrealized loss position was $475 million and $604 million at March 31, 2014 and December 31, 2013, respectively.

[3] Dominion’s Consolidated Balance Sheet at December 31, 2013 has been derived from the audited Consolidated Financial Statements at that date.

[4] Includes pending purchases of securities of $13 million and pending sales of securities of $11 million at March 31, 2014 and December 31, 2013, respectively.

[5] The fair value of securities in an unrealized loss position was $211 million and $299 million at March 31, 2014 and December 31, 2013, respectively.

[6] Virginia Power’s Consolidated Balance Sheet at December 31, 2013 has been derived from the audited Consolidated Financial Statements at that date.

[7] Includes pending purchases of securities of $15 million and pending sales of securities of $6 million at March 31, 2014 and December 31, 2013, respectively.