Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating Revenue	$ 2,813		$ 2,980		$ 6,443		$ 6,503
Purchased gas	324		297		864		764
Electric fuel and other energy-related purchases	633		875		1,967		1,826
Interest and related charges	227		203		464		431
Other income	57		49		97		136
Income from continuing operations including noncontrolling interests before income tax expense	224		394		795		1,183
Income tax expense	(63)		(116)		(249)		(404)
Income from continuing operations including noncontrolling interests	161		278		546		779
Dominion Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating Revenue	428	[1]	430	[1]	997	[1]	1,016	[1]
Purchased gas	76	[1]	63	[1]	213	[1]	177	[1]
Interest and related charges	6	[1]	6	[1]	12	[1]	13	[1]
Other income	5		3		13		14
Income from continuing operations including noncontrolling interests before income tax expense	153		85		420		313
Income tax expense	(60)		(32)		(163)		(122)
Deferred gains and losses on derivatives-hedging activities | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income from continuing operations including noncontrolling interests before income tax expense	(22)		(26)		238		98
Income tax expense	6		9		(94)		(39)
Income from continuing operations including noncontrolling interests	(16)		(17)		144		59
Deferred gains and losses on derivatives-hedging activities | Amounts reclassified from AOCI | Dominion Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income from continuing operations including noncontrolling interests before income tax expense	5		0		12		4
Income tax expense	(2)		0		(4)		(1)
Income from continuing operations including noncontrolling interests	3		0		8		3
Unrealized gains and losses on investment securities | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income	(13)		(17)		(33)		(64)
Impairment	2		3		4		5
Income from continuing operations including noncontrolling interests before income tax expense	(11)		(14)		(29)		(59)
Income tax expense	4		5		11		23
Income from continuing operations including noncontrolling interests	(7)		(9)		(18)		(36)
Unrecognized pension and other postretirement benefit costs | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior service (credit) costs	(2)		(6)		(5)		(6)
Actuarial (gains) losses	17		27		34		56
Income from continuing operations including noncontrolling interests before income tax expense	15		21		29		50
Income tax expense	(6)		(11)		(12)		(20)
Income from continuing operations including noncontrolling interests	9		10		17		30
Unrecognized pension and other postretirement benefit costs | Amounts reclassified from AOCI | Dominion Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Actuarial (gains) losses	1		2		4		5
Income from continuing operations including noncontrolling interests before income tax expense	1		2		4		5
Income tax expense	0		(1)		(1)		(2)
Income from continuing operations including noncontrolling interests	1		1		3		3
Commodity contracts | Deferred gains and losses on derivatives-hedging activities | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating Revenue	(28)		(29)		241		55
Purchased gas	3				4		34
Electric fuel and other energy-related purchases					(13)		3
Commodity contracts | Deferred gains and losses on derivatives-hedging activities | Amounts reclassified from AOCI | Dominion Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Line Items]
Operating Revenue	2		(3)		7		(2)
Purchased gas	3		3		5		6
Interest rate contracts | Deferred gains and losses on derivatives-hedging activities | Amounts reclassified from AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest and related charges	$ 3		$ 3		$ 6		$ 6

[1] See Note 17 for amounts attributable to related parties.