Investments (Recorded Other-Than-Temporary Impairment Losses on Investments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Total other-than-temporary impairment losses	$ 21	[1]	$ 31	[1]	$ 26	[1]
Losses recorded to decommissioning trust regulatory liability	(5)		(13)		(10)
Losses recognized in other comprehensive income (before taxes)	(3)		(10)		(2)
Net impairment losses recognized in earnings	13		8		14
Other-than-temporary impairment losses for debt securities	3		18		4
Virginia Electric and Power Company
Schedule of Available-for-sale Securities [Line Items]
Total other-than-temporary impairment losses	8	[2]	15	[2]	11	[2]
Losses recorded to decommissioning trust regulatory liability	(4)		(13)		(10)
Losses recognized in other comprehensive income (before taxes)	(2)		(1)		0
Net impairment losses recognized in earnings	2		1		1
Other-than-temporary impairment losses for debt securities	$ 2		$ 9		$ 2

[1] Amounts include other-than-temporary impairment losses for debt securities of $3 million, $18 million and $4 million at December 31, 2014, 2013 and 2012, respectively.

[2] Dominion has a $50 million commitment to invest in clean power and technology businesses through 2018. Includes Dominion's investment in Atlantic Coast Pipeline. See Note 15 for more information.