Regulatory Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Regulatory Assets and Liablities [Line Items]
Deferred rate adjustment clause costs	$ 72	[1]	$ 55	[1]
Derivatives	18	[2]	0	[2]
Plant retirement	6	[3]	25	[3]
Unrecovered gas cost	21	[4]	59	[4]
Other	67		64
Regulatory assets current	184	[5]	203	[5]
Unrecognized pension and other postretirement benefit costs	934	[6]	1,210	[6]
Deferred rate adjustment clause costs	257	[1]	173	[1]
Income taxes recoverable through future rates	164	[7]	140	[7]
Derivatives	34	[2]	105	[2]
Other	89		89
Regulatory assets-non-current	1,478		1,717	[8]
Total regulatory assets	1,662		1,920
PIPP	143	[9]	100	[9]
Other	45		36
Regulatory liabilities current	188	[10]	136	[10]
Provision for future cost of removal and AROs	1,031	[11]	985	[11]
Decommissioning trust	617	[12]	501	[12]
Other	70		28
Regulatory liabilities-non-current	1,718		1,514	[8]
Total regulatory liabilities	1,906		1,650
Virginia Electric and Power Company
Regulatory Assets and Liablities [Line Items]
Deferred rate adjustment clause costs	72	[1]	51	[1]
Derivatives	18	[2]	0	[2]
Plant retirement	6	[3]	25	[3]
Other	50		43
Regulatory assets current	146	[5]	119	[5]
Deferred rate adjustment clause costs	204	[1]	127	[1]
Income taxes recoverable through future rates	132	[7]	110	[7]
Derivatives	34	[2]	105	[2]
Other	50		54
Regulatory assets-non-current	420		396	[13]
Total regulatory assets	566		515
Other	37		32
Regulatory liabilities current	37	[10]	32	[10]
Provision for future cost of removal	799	[11]	763	[11]
Decommissioning trust	617	[12]	501	[12]
Other	55		21
Regulatory liabilities-non-current	1,471		1,285	[13]
Total regulatory liabilities	$ 1,508		$ 1,317

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

[2] 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.

[3] Reflects costs anticipated to be recovered in base rates for certain coal units expected to be retired.

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

[5] Current regulatory assets are presented in other current assets in Dominion's and Virginia Power's 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 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] Dominion’s Consolidated Balance Sheet at December 31, 2012 has been derived from the audited Consolidated Financial Statements at that date.

[9] Under PIPP, eligible customers can receive energy assistance 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.

[10] Current regulatory liabilities are presented in other current liabilities in Dominion's and Virginia Power's Consolidated Balance Sheets.

[11] 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.

[12] 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.

[13] Virginia Power’s Consolidated Balance Sheet at December 31, 2012 has been derived from the audited Consolidated Financial Statements at that date.