Accumulated Other Comprehensive Income (Schedule of Changes in 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		Mar. 31, 2013		Jun. 30, 2014		Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (299)		$ (820)		$ (877)		$ (324)	[1]	$ (877)
Other comprehensive income before reclassifications: gains (losses)	(4)		353				(136)		341
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	(14)	[2]	(16)	[2]			143	[2]	53	[2]
Total other comprehensive income (loss)	(18)		337				7		394
Ending balance	(317)		(483)				(317)		(483)
Dominion Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(60)		(121)		(140)		(58)	[3]	(140)
Other comprehensive income before reclassifications: gains (losses)	(19)				65		(28)		79
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	4	[2]			1	[2]	11	[2]	6	[2]
Total other comprehensive income (loss)	(15)		66		66		(17)		85
Ending balance	(75)		(55)		(121)		(75)		(55)
Deferred gains and losses on derivatives-hedging activities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(278)		(136)		(122)		(288)		(122)
Other comprehensive income before reclassifications: gains (losses)	(59)		122				(209)		32
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	(16)	[2]	(17)	[2]			144	[2]	59	[2]
Total other comprehensive income (loss)	(75)		105				(65)		91
Ending balance	(353)		(31)				(353)		(31)
Deferred gains and losses on derivatives-hedging activities | Dominion Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0				(47)		3		(47)
Other comprehensive income before reclassifications: gains (losses)	(19)				52		(27)		66
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	3	[2]			0	[2]	8	[2]	3	[2]
Total other comprehensive income (loss)	(16)				52		(19)		69
Ending balance	(16)		22		(30)		(16)		22
Unrealized gains and losses on investment securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	492		377		326		474		326
Other comprehensive income before reclassifications: gains (losses)	49		3				78		81
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	(7)	[2]	(9)	[2]			(18)	[2]	(36)	[2]
Total other comprehensive income (loss)	42		(6)				60		45
Ending balance	534		371				534		371
Unrecognized pension and other postretirement benefit costs
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(506)		(1,061)		(1,081)		(510)		(1,081)
Other comprehensive income before reclassifications: gains (losses)	4		228				0		228
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	9	[2]	10	[2]			17	[2]	30	[2]
Total other comprehensive income (loss)	13		238				17		258
Ending balance	(493)		(823)				(493)		(823)
Unrecognized pension and other postretirement benefit costs | Dominion Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(60)				(93)		(61)		(93)
Other comprehensive income before reclassifications: gains (losses)	0				13		(1)		13
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	1	[2]			1	[2]	3	[2]	3	[2]
Total other comprehensive income (loss)	1				14		2		16
Ending balance	(59)		(77)		(91)		(59)		(77)
Other comprehensive income (loss) from equity method investee
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(7)		0		0		0		0
Other comprehensive income before reclassifications: gains (losses)	2		0				(5)		0
Amounts reclassified from accumulated other comprehensive income (loss): (gains) losses	0	[2]	0	[2]			0	[2]	0	[2]
Total other comprehensive income (loss)	2		0				(5)		0
Ending balance	$ (5)		$ 0				$ (5)		$ 0

[1] Dominion’s Consolidated Balance Sheet at December 31, 2013 has been derived from the audited Consolidated Financial Statements at that date.

[2] See table below for details about these reclassifications.

[3] Dominion Gas’ Consolidated Balance Sheet at December 31, 2013 has been derived from the Audited Consolidated Financial Statements at that date.