Earnings Per Share (Calculation of Our Basic and Diluted EPS) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Earnings Per Share [Abstract]
Net income attributable to Dominion	$ 495		$ 494	[1]
Average shares of common stock outstanding - Basic (shares)	576,600,000		570,500,000
Net effect of potentially dilutive securities (shares)	900,000	[2]	1,400,000	[2]
Average shares of common stock outstanding - Diluted (shares)	577,500,000		571,900,000
Earnings Per Common Share - Basic (dollars per share)	$ 0.86		$ 0.86
Earnings Per Common Share - Diluted (dollars per share)	$ 0.86		$ 0.86
Potentially dilutive securities excluded from computation of earnings per share (shares)	0		0

[1] Recast to reflect Brayton Point and Kincaid as discontinued operations, as discussed in Note 3.

[2] Potentially dilutive securities consist primarily of goal-based stock and contingently convertible senior notes.