Employee Benefit Plans (Net Periodic Benefit Cost) (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
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 28		$ 34		$ 57		$ 69
Interest cost	73		67		145		133
Expected return on plan assets	(125)		(115)		(250)		(229)
Amortization of prior service cost (credit)	1		1		2		2
Amortization of net actuarial loss	28		44		56		90
Settlements and curtailments	0	[1]	(2)	[1]	0	[1]	(2)	[1]
Net periodic benefit cost (credit)	5		29		10		63
Pension Benefits | Dominion Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Service cost	3		4		6		7
Interest cost	7		7		14		13
Expected return on plan assets	(28)		(27)		(57)		(52)
Amortization of prior service cost (credit)	0		0		0		0
Amortization of net actuarial loss	4		7		9		14
Net periodic benefit cost (credit)	(14)		(9)		(28)		(18)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	8		12		16		24
Interest cost	16		18		33		37
Expected return on plan assets	(27)		(22)		(55)		(44)
Amortization of prior service cost (credit)	(7)		(3)		(14)		(6)
Amortization of net actuarial loss	1		2		1		4
Settlements and curtailments	0	[1]	(15)	[1]	0	[1]	(15)	[1]
Net periodic benefit cost (credit)	(9)		(8)		(19)		0
Other Postretirement Benefits | Dominion Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Service cost	2		2		3		4
Interest cost	3		3		6		6
Expected return on plan assets	(6)		(4)		(11)		(9)
Amortization of prior service cost (credit)	(1)		(1)		(1)		(2)
Amortization of net actuarial loss	0		0		0		1
Net periodic benefit cost (credit)	$ (2)		$ 0		$ (3)		$ 0

[1] Relate primarily to the decommissioning of Kewaunee.