Earnings Per Share (Calculation of our Basic and Diluted EPS) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Earnings Per Share [Abstract]
Net income attributable to Dominion	$ 243	$ 529	$ 159	$ 379	$ 431	$ 569	$ 202	$ 495	$ 1,310		$ 1,697		$ 302
Average shares of common stock outstanding-Basic									582,700,000		578,700,000		572,900,000
Net effect of potentially dilutive securities									1,800,000	[1]	800,000	[1]	1,000,000	[1]
Average shares of common stock outstanding-Diluted									584,500,000		579,500,000		573,900,000
Earnings Per Common Share-Basic (in dollars per share)	$ 0.42	$ 0.91	$ 0.27	$ 0.65	$ 0.74	$ 0.98	$ 0.35	$ 0.86	$ 2.25		$ 2.93		$ 0.53
Earnings Per Common Share-Diluted (in dollars per share)	$ 0.42	$ 0.90	$ 0.27	$ 0.65	$ 0.74	$ 0.98	$ 0.35	$ 0.86	$ 2.24		$ 2.93		$ 0.53
Potentially dilutive securities excluded from the calculation of diluted EPS													0

[1] Dilutive securities consist primarily of contingently convertible senior notes and the 2013 Equity Units for 2014 and contingently convertible senior notes for 2013 and 2012. Dominion redeemed all of its contingently convertible senior notes in 2014. See Note 17 for more information.