Regulatory Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Regulatory Assets and Liablities [Line Items]
Deferred cost of fuel used in electric generation	$ 122	[1]	$ 79	[1]
Deferred rate adjustment clause costs	108	[2]	124	[2]
Deferred nuclear refueling outage costs	57	[3]	44	[3]
Unrecovered gas costs	16	[4]	36	[4]
Other	59		64
Regulatory assets current	362	[5]	347	[5]
Unrecognized pension and other postretirement benefit costs	1,034	[6]	1,050	[6]
Deferred rate adjustment clause costs	216	[2]	250	[2]
Derivatives	150	[7]	101	[7]
Income taxes recoverable through future rates	136	[8]	133	[8]
Other	129		108
Regulatory assets-non-current	1,665		1,642	[9]
Total regulatory assets	2,027		1,989
PIPP	63	[10]	71	[10]
Other	43		99
Regulatory liabilities current	106	[11]	170	[11]
Provision for future cost of removal and AROs	1,100	[12]	1,072	[12]
Nuclear decommissioning trust	822	[13]	815	[13]
Other	197		104
Regulatory liabilities-non-current	2,119		1,991	[9]
Total regulatory liabilities	2,225		2,161
Amortization period for deferred costs	18 months
Virginia Electric and Power Company
Regulatory Assets and Liablities [Line Items]
Deferred cost of fuel used in electric generation	122	[1]	79	[1]
Deferred rate adjustment clause costs	106	[2]	117	[2]
Deferred nuclear refueling outage costs	57	[3]	44	[3]
Other	54		58
Regulatory assets current	339		298	[14]
Deferred rate adjustment clause costs	141	[2]	179	[2]
Derivatives	150	[7]	101	[7]
Income taxes recoverable through future rates	103	[8]	100	[8]
Other	70		59
Regulatory assets-non-current	464		439	[14]
Total regulatory assets	803		737
Other	23		90
Regulatory liabilities current	23	[11]	90	[11]
Provision for future cost of removal	864	[12]	852	[12]
Nuclear decommissioning trust	822	[13]	815	[13]
Other	83		16
Regulatory liabilities-non-current	1,769		1,683	[14]
Total regulatory liabilities	1,792		1,773
Dominion Gas Holdings, LLC
Regulatory Assets and Liablities [Line Items]
Deferred rate adjustment clause costs	2	[2]	7	[2]
Unrecovered gas costs	13	[4]	29	[4]
Other	1		2
Regulatory assets current	16	[5]	38	[5]
Unrecognized pension and other postretirement benefit costs	239	[6]	242	[6]
Deferred rate adjustment clause costs	75	[2]	71	[2]
Income taxes recoverable through future rates	24	[8]	24	[8]
Other	52		42
Regulatory assets-non-current	390		379	[15]
Total regulatory assets	406		417
PIPP	63	[10]	71	[10]
Other	16		4
Regulatory liabilities current	79	[11]	75	[11]
Provision for future cost of removal and AROs	172	[12]	172	[12]
Other	26		20
Regulatory liabilities-non-current	198	[16]	192	[16]
Total regulatory liabilities	$ 277		$ 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] 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.

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

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