Income Taxes (Income Tax Expense for Continuing Operations Including Noncontrolling Interests) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ (11)	$ 317	$ 43
State	14	110	84
Total current expense (benefit)	3	427	127
Federal
Taxes before operating loss carryforwards and investment tax credits	956	563	645
Tax benefit of operating loss carryforwards	(352)	(18)	0
Investment tax credits	(152)	(48)	0
State	(2)	(31)	40
Total deferred expense	450	466	685
Amortization of deferred investment tax credits	(1)	(1)	(1)
Total income tax expense	452	892	811
Virginia Electric and Power Company
Current:
Federal	85	357	70
State	67	62	81
Total current expense (benefit)	152	419	151
Federal
Taxes before operating loss carryforwards and investment tax credits	381	224	482
Tax benefit of operating loss carryforwards	0	0	0
Investment tax credits	0	0	0
State	16	17	21
Total deferred expense	397	241	503
Amortization of deferred investment tax credits	(1)	(1)	(1)
Total income tax expense	548	659	653
Dominion Gas Holdings, LLC
Current:
Federal	86	158	(8)
State	32	41	2
Total current expense (benefit)	118	199	(6)
Federal
Taxes before operating loss carryforwards and investment tax credits	192	92	257
Tax benefit of operating loss carryforwards	0	0	0
Investment tax credits	0	0	0
State	24	10	37
Total deferred expense	216	102	294
Amortization of deferred investment tax credits	0	0	0
Total income tax expense	$ 334	$ 301	$ 288