Earnings Per Share (Calculation of Our Basic and Diluted EPS) (Details) (USD $) In Millions, except Per Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Earnings Per Share [Abstract]
Net income (loss) attributable to Dominion	$ 392		$ 575		$ 1,207		$ 2,510
Average shares of common stock outstanding - Basic	569.4		585.0		574.2		591.7
Net effect of potentially dilutive securities	1.8	[1]	1.4	[1]	1.4	[1]	1.1	[1]
Average shares of common stock outstanding - Diluted	571.2		586.4		575.6		592.8
Earnings Per Common Share - Basic	$ 0.69		$ 0.98		$ 2.10		$ 4.24
Earnings Per Common Share - Diluted	$ 0.69		$ 0.98		$ 2.10		$ 4.23

[1] Potentially dilutive securities consist of options, goal-based stock and contingently convertible senior notes.