Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
Regulatory Assets and Liablities [Line Items]
Deferred rate adjustment clause costs	[1]	$ 109	$ 90
Deferred cost of fuel used in electric generation	[2]	103	111
Deferred nuclear refueling outage costs	[3]	77	75
Other		62	75
Regulatory assets current	[4]	351	351
Unrecognized pension and other postretirement benefit costs	[5]	1,004	1,015
Deferred rate adjustment clause costs	[1]	255	295
Derivatives	[6]	245	110
PJM transmission rates	[7]	192	192
Income taxes recoverable through future rates	[8]	132	126
Other		149	127
Regulatory assets-non-current		1,977	1,865	[9]
Total regulatory assets		2,328	2,216
PIPP	[10]	30	46
Other		45	54
Regulatory liabilities current	[11]	75	100
Provision for future cost of removal and AROs	[12]	1,132	1,120
Nuclear decommissioning trust	[13]	822	804
Deferred cost of fuel used in electric generation	[2]	129	97
Derivatives	[6]	94	79
Other		177	185
Regulatory liabilities-non-current		2,354	2,285	[9]
Total regulatory liabilities		$ 2,429	2,385
Amortization period for deferred costs		18 months
Virginia Electric and Power Company
Regulatory Assets and Liablities [Line Items]
Deferred rate adjustment clause costs	[1]	$ 106	80
Deferred cost of fuel used in electric generation	[2]	103	111
Deferred nuclear refueling outage costs	[3]	77	75
Other		57	60
Regulatory assets current		343	326	[14]
Deferred rate adjustment clause costs	[1]	170	213
Derivatives	[6]	245	110
PJM transmission rates	[7]	192	192
Income taxes recoverable through future rates	[8]	102	97
Other		66	55
Regulatory assets-non-current		775	667	[14]
Total regulatory assets		1,118	993
Other		19	35
Regulatory liabilities current	[11]	19	35
Nuclear decommissioning trust	[13]	822	804
Deferred cost of fuel used in electric generation	[2]	129	97
Derivatives	[6]	94	79
Provision for future cost of removal	[12]	899	890
Other		52	59
Regulatory liabilities-non-current		1,996	1,929	[14]
Total regulatory liabilities		2,015	1,964
Dominion Gas Holdings, LLC
Regulatory Assets and Liablities [Line Items]
Deferred rate adjustment clause costs	[1]	3	10
Other		2	13
Regulatory assets current	[4]	5	23
Unrecognized pension and other postretirement benefit costs	[5]	280	282
Deferred rate adjustment clause costs	[1]	85	82
Income taxes recoverable through future rates	[8]	20	20
Other		75	65
Regulatory assets-non-current	[15]	460	449
Total regulatory assets		465	472
PIPP	[10]	30	46
Other		19	9
Regulatory liabilities current	[11]	49	55
Provision for future cost of removal and AROs	[12]	172	170
Other		35	31
Regulatory liabilities-non-current	[16]	207	201
Total regulatory liabilities		$ 256	$ 256

[1] 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.

[2] Primarily reflects deferred fuel expenses for the Virginia jurisdiction of Dominion's and Virginia Power's generation operations. 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] Current regulatory assets are presented in other current assets in Dominion's and Dominion Gas' Consolidated Balance Sheets.

[5] 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.

[6] 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 refunded to customers.

[7] Reflects amounts related to PJM transmission cost allocation matter. See Note 12 for more information.

[8] 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.

[9] Dominion’s Consolidated Balance Sheet at December 31, 2015 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, 2015 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.