Regulatory Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Regulatory Assets and Liablities [Line Items]
Deferred rate adjustment clause costs	$ 59	[1]	$ 55	[1]
Unrecovered gas cost	27	[2]	59	[2]
Deferred cost of fuel used in electric generation	17	[3]	0	[3]
Other	74		89
Regulatory assets current	177	[4]	203	[4]
Unrecognized pension and other postretirement benefit costs	1,192	[5]	1,210	[5]
Deferred rate adjustment clause costs	181	[1]	173	[1]
Income taxes recoverable through future rates	149	[6]	140	[6]
Derivatives	85	[7]	105	[7]
Other	89		89
Regulatory assets-non-current	1,696		1,717	[8]
Total regulatory assets	1,873		1,920
PIPP	118	[9]	100	[9]
Other	29		36
Regulatory liabilities current	147	[10]	136	[10]
Provision for future cost of removal and AROs	1,005	[11]	985	[11]
Decommissioning trust	575	[12]	501	[12]
Other	66		28
Regulatory liabilities-non-current	1,646		1,514	[8]
Total regulatory liabilities	1,793		1,650
Virginia Electric and Power Company
Regulatory Assets and Liablities [Line Items]
Deferred rate adjustment clause costs	58	[1]	51	[1]
Deferred cost of fuel used in electric generation	17	[3]	0	[3]
Other	70		68
Regulatory assets current	145	[4]	119	[4]
Deferred rate adjustment clause costs	130	[1]	127	[1]
Income taxes recoverable through future rates	118	[6]	110	[6]
Derivatives	85	[7]	105	[7]
Other	55		54
Regulatory assets-non-current	388		396	[13]
Total regulatory assets	533		515
Other	19		32
Regulatory liabilities current	19	[10]	32	[10]
Provision for future cost of removal	780	[11]	763	[11]
Decommissioning trust	575	[12]	501	[12]
Other	59		21
Regulatory liabilities-non-current	1,414		1,285	[13]
Total regulatory liabilities	$ 1,433		$ 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] Reflects unrecovered gas costs at Dominion's regulated gas operations, which are recovered through quarterly or annual filings with the applicable regulatory authority.

[3] Primarily reflects deferred fuel expenses for the Virginia jurisdiction of Virginia Power's generation operations.

[4] Current regulatory assets are presented in other current assets in Dominion's and Virginia Power's 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 rate-regulated subsidiaries.

[6] 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.

[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] 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.