Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Investment tax credits	$ (152)	$ (48)	$ 0
Unrecognized tax benefits that would impact effective tax rate	77	126	167
Change in unrecognized tax benefits	(47)	(29)	1
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations	30
Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Amount that earnings could potentially increase if changes were to occur				10
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	2,200
Investment tax credits	245
Tax credits	65
Payment after conclusion of audit			46
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	1,700
Carryforwards valuation allowance	962
General Business | State
Operating Loss Carryforwards [Line Items]
Tax credits	194
Investment Credit That Expires In 2014 | State
Operating Loss Carryforwards [Line Items]
Tax credits	29
Virginia Electric and Power Company
Operating Loss Carryforwards [Line Items]
Noncurrent income tax payable	38	28
Income tax receivable	225
Investment tax credits	0	0	0
Unrecognized tax benefits that would impact effective tax rate	8	8	13
Change in unrecognized tax benefits	1	4	1
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations	25
Virginia Electric and Power Company | Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Amount that earnings could potentially increase if changes were to occur				7
Virginia Electric and Power Company | Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforward	279
Tax credits	14
Virginia Electric and Power Company | State
Operating Loss Carryforwards [Line Items]
Income tax receivable		3
Dominion Gas Holdings, LLC
Operating Loss Carryforwards [Line Items]
Investment tax credits	0	0	0
Unrecognized tax benefits that would impact effective tax rate		19	20
Change in unrecognized tax benefits	1	1	1
Dominion Gas Holdings, LLC | Federal
Operating Loss Carryforwards [Line Items]
Income tax receivable	96
Operating loss carryforward	25
Dominion Gas Holdings, LLC | State
Operating Loss Carryforwards [Line Items]
Noncurrent income tax payable	7	7
Operating loss carryforward	$ 4