Commitments and Contingencies (Subsidiary Guarantees) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Commitments and Contingencies [Line Items]
Stated Limit	$ 4,281
Value	532	[1]
Subsidiary Debt
Commitments and Contingencies [Line Items]
Stated Limit	27	[2]
Value	27	[1],[2]
Commodity Transactions
Commitments and Contingencies [Line Items]
Stated Limit	3,059	[3]
Value	351	[1],[3]
Nuclear Obligations
Commitments and Contingencies [Line Items]
Stated Limit	232	[4]
Value	50	[1],[4]
Cove Point
Commitments and Contingencies [Line Items]
Stated Limit	335	[5]
Value	0	[1],[5]
Other
Commitments and Contingencies [Line Items]
Stated Limit	628	[6]
Value	104	[1],[6]
Millstone | Nuclear Obligations
Commitments and Contingencies [Line Items]
Stated Limit	150
Kewaunee | Nuclear Obligations
Commitments and Contingencies [Line Items]
Stated Limit	$ 60

[1] Represents the estimated portion of the guarantee's stated limit that is utilized as of June 30, 2013 based upon prevailing economic conditions and fact patterns specific to each guarantee arrangement. For those guarantees related to obligations that are recorded as liabilities by Dominion's subsidiaries, the value includes the recorded amount.

[2] Guarantee of debt of a DEI subsidiary. In the event of default by the subsidiary, Dominion would be obligated to repay such amounts.

[3] Guarantees related to energy trading and marketing activities and other commodity commitments of certain subsidiaries, including subsidiaries of Virginia Power and DEI. These guarantees were provided to counterparties in order to facilitate physical and financial transactions in gas, oil, electricity, pipeline capacity, transportation and related commodities and services. If any of these subsidiaries fail to perform or pay under the contracts and the counterparties seek performance or payment, Dominion would be obligated to satisfy such obligation. Dominion and its subsidiaries receive similar guarantees as collateral for credit extended to others. The value provided includes certain guarantees that do not have stated limits.

[4] Guarantees related to certain DEI subsidiaries' potential retrospective premiums that could be assessed if there is a nuclear incident under Dominion's nuclear insurance programs and guarantees for a DEI subsidiary's and Virginia Power's commitment to buy nuclear fuel. Excludes Dominion's agreement to provide up to $150 million and $60 million to two DEI subsidiaries to pay the operating expenses of Millstone and Kewaunee, respectively, in the event of a prolonged outage, as part of satisfying certain NRC requirements concerned with ensuring adequate funding for the operations of nuclear power stations. The agreement for Kewaunee also provides for funds through the completion of decommissioning.

[5] Guarantees related to Cove Point, including agreements to support terminal service and transportation agreements as well as an engineering, procurement and construction contract for new liquefaction facilities. Includes certain guarantees that do not have stated limits.

[6] Guarantees related to other miscellaneous contractual obligations such as leases, environmental obligations and construction projects. Also includes guarantees related to certain DEI subsidiaries' obligations for equity capital contributions and energy generation associated with Fowler Ridge and NedPower.