Equity (Schedule of Components of Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (324)		$ (877)
Other comprehensive income before reclassifications: gains (losses)	(164)		476
Amounts reclassified from accumulated other comprehensive income: (gains) losses	72	[1]	77	[1]
Other comprehensive income (loss)	(92)		553		(267)
Ending balance	(416)		(324)		(877)
Deferred gains and losses on derivatives-hedging activities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(288)		(122)
Other comprehensive income before reclassifications: gains (losses)	17		(243)
Amounts reclassified from accumulated other comprehensive income: (gains) losses	93	[1]	77	[1]
Other comprehensive income (loss)	110		(166)
Ending balance	(178)		(288)
Unrealized gains and losses on investment securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	474		326
Other comprehensive income before reclassifications: gains (losses)	128		203
Amounts reclassified from accumulated other comprehensive income: (gains) losses	(54)	[1]	(55)	[1]
Other comprehensive income (loss)	74		148
Ending balance	548		474
Unrecognized pension and other postretirement benefit costs
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(510)		(1,081)
Other comprehensive income before reclassifications: gains (losses)	(305)		516
Amounts reclassified from accumulated other comprehensive income: (gains) losses	33	[1]	55	[1]
Other comprehensive income (loss)	(272)		571
Ending balance	(782)		(510)
Other comprehensive loss from equity method investees
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	0		0
Other comprehensive income before reclassifications: gains (losses)	(4)		0
Amounts reclassified from accumulated other comprehensive income: (gains) losses	0	[1]	0	[1]
Other comprehensive income (loss)	(4)		0
Ending balance	(4)		0
Virginia Electric and Power Company
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	48		25
Other comprehensive income before reclassifications: gains (losses)	11		26
Amounts reclassified from accumulated other comprehensive income: (gains) losses	(9)	[1]	(3)	[1]
Other comprehensive income (loss)	2		23		6
Ending balance	50		48		25
Virginia Electric and Power Company | Deferred gains and losses on derivatives-hedging activities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	0		(6)
Other comprehensive income before reclassifications: gains (losses)	(4)		6
Amounts reclassified from accumulated other comprehensive income: (gains) losses	(3)	[1]	0	[1]
Other comprehensive income (loss)	(7)		6
Ending balance	(7)		0
Virginia Electric and Power Company | Unrealized gains and losses on investment securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	48		31
Other comprehensive income before reclassifications: gains (losses)	15		20
Amounts reclassified from accumulated other comprehensive income: (gains) losses	(6)	[1]	(3)	[1]
Other comprehensive income (loss)	9		17
Ending balance	57		48
Dominion Gas Holdings, LLC
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(58)		(140)
Other comprehensive income before reclassifications: gains (losses)	(41)		65
Amounts reclassified from accumulated other comprehensive income: (gains) losses	13	[1]	17	[1]
Other comprehensive income (loss)	(28)		82		31
Ending balance	(86)		(58)		(140)
Dominion Gas Holdings, LLC | Deferred gains and losses on derivatives-hedging activities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	3		(47)
Other comprehensive income before reclassifications: gains (losses)	(31)		39
Amounts reclassified from accumulated other comprehensive income: (gains) losses	8	[1]	11	[1]
Other comprehensive income (loss)	(23)		50
Ending balance	(20)		3
Dominion Gas Holdings, LLC | Unrealized gains and losses on investment securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(61)		(93)
Other comprehensive income before reclassifications: gains (losses)	(10)		26
Amounts reclassified from accumulated other comprehensive income: (gains) losses	5	[1]	6	[1]
Other comprehensive income (loss)	(5)		32
Ending balance	$ (66)		$ (61)

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