Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2015	Dec. 31, 2014
Regulatory Assets and Liablities [Line Items]
Deferred Fuel Cost, Non-current Liability	[1]	$ 73	$ 6
Deferred cost of fuel used in electric generation	[1]	107	79
Deferred rate adjustment clause costs	[2]	119	124
Deferred nuclear refueling outage costs	[3]	59	44
Unrecovered gas costs	[4]	12	36
Other		59	64
Regulatory assets current	[5]	356	347
Unrecognized pension and other postretirement benefit costs	[6]	1,000	1,050
Deferred rate adjustment clause costs	[2]	227	250
Income taxes recoverable through future rates	[7]	121	133
Derivatives	[8]	125	101
Other		120	108
Regulatory assets-non-current		1,593	1,642	[9]
Total regulatory assets		1,949	1,989
PIPP	[10]	52	71
Other		63	99
Regulatory liabilities current	[11]	115	170
Provision for future cost of removal and AROs	[12]	1,136	1,072
Nuclear decommissioning trust	[13]	745	815
Other		219	98
Regulatory liabilities-non-current		2,173	1,991	[9]
Total regulatory liabilities		$ 2,288	2,161
Amortization period for deferred costs		18 months
Virginia Electric and Power Company
Regulatory Assets and Liablities [Line Items]
Deferred Fuel Cost, Non-current Liability	[1]	$ 73	6
Deferred cost of fuel used in electric generation	[1]	107	79
Deferred rate adjustment clause costs	[2]	106	117
Deferred nuclear refueling outage costs	[3]	59	44
Other		56	58
Regulatory assets current		328	298	[14]
Deferred rate adjustment clause costs	[2]	148	179
Income taxes recoverable through future rates	[7]	93	100
Derivatives	[8]	125	101
Other		56	59
Regulatory assets-non-current		422	439	[14]
Total regulatory assets		750	737
Other		44	90
Regulatory liabilities current	[11]	44	90
Provision for future cost of removal	[12]	886	852
Nuclear decommissioning trust	[13]	745	815
Other		118	10
Regulatory liabilities-non-current		1,822	1,683	[14]
Total regulatory liabilities		1,866	1,773
Dominion Gas Holdings, LLC
Regulatory Assets and Liablities [Line Items]
Deferred rate adjustment clause costs	[2]	13	7
Unrecovered gas costs	[4]	10	29
Other		1	2
Regulatory assets current	[5]	24	38
Unrecognized pension and other postretirement benefit costs	[6]	231	242
Deferred rate adjustment clause costs	[2]	78	71
Income taxes recoverable through future rates	[7]	19	24
Other		59	42
Regulatory assets-non-current	[15]	387	379
Total regulatory assets		411	417
PIPP	[10]	52	71
Other		10	4
Regulatory liabilities current	[11]	62	75
Provision for future cost of removal and AROs	[12]	171	172
Other		36	20
Regulatory liabilities-non-current	[16]	207	192
Total regulatory liabilities		$ 269	$ 267

[1] Primarily reflects deferred fuel expenses for the Virginia jurisdiction of Virginia Power's generation operations. See Note 12 for more information.

[2] Reflects deferrals under the electric transmission FERC formula rate and the deferral of costs associated with certain current and prospective rider projects for Virginia Power. Reflects deferrals of costs associated with certain current and prospective rider projects for Dominion Gas. See Note 12 for more information.

[3] Legislation enacted in Virginia in April 2014 requires Virginia Power to defer operation and maintenance costs incurred in connection with the refueling of any nuclear-powered generating plant. These deferred costs will be amortized over the refueling cycle, not to exceed 18 months.

[4] Reflects unrecovered gas costs at regulated gas operations, which are recovered through filings with the applicable regulatory authority.

[5] Current regulatory assets are presented in other current assets in Dominion's and Dominion Gas' Consolidated Balance Sheets.

[6] Represents unrecognized pension and other postretirement employee benefit costs expected to be recovered through future rates generally over the expected remaining service period of plan participants by certain of Dominion's and Dominion Gas' rate-regulated subsidiaries.

[7] Amounts to be recovered through future rates to pay income taxes that become payable when rate revenue is provided to recover AFUDC-equity and depreciation of property, plant and equipment for which deferred income taxes were not recognized for ratemaking purposes, including amounts attributable to tax rate changes.

[8] For jurisdictions subject to cost-based rate regulation, changes in the fair value of derivative instruments result in the recognition of regulatory assets or regulatory liabilities as they are expected to be recovered from or passed on to customers based on the ultimate settlement amount of the derivative.

[9] Dominion’s Consolidated Balance Sheet at December 31, 2014 has been derived from the audited Consolidated Financial Statements at that date.

[10] Under PIPP, eligible customers can make reduced payments based on their ability to pay. The difference between the customer's total bill and the PIPP plan amount is deferred and collected or returned annually under the PIPP rate adjustment clause according to East Ohio tariff provisions.

[11] Current regulatory liabilities are presented in other current liabilities in the Companies' Consolidated Balance Sheets.

[12] Rates charged to customers by the Companies' regulated businesses include a provision for the cost of future activities to remove assets that are expected to be incurred at the time of retirement.

[13] Primarily reflects a regulatory liability representing amounts collected from Virginia jurisdictional customers and placed in external trusts (including income, losses and changes in fair value thereon) for the future decommissioning of Virginia Power's utility nuclear generation stations, in excess of the related AROs.

[14] Virginia Power’s Consolidated Balance Sheet at December 31, 2014 has been derived from the audited Consolidated Financial Statements at that date.

[15] Noncurrent regulatory assets are presented in other deferred charges and other assets in Dominion Gas' Consolidated Balance Sheets.

[16] Noncurrent regulatory liabilities are presented in other deferred credits and other liabilities in Dominion Gas' Consolidated Balance Sheets.