Commitments and Contingencies (Subsidiary Guarantees) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) guarantee Subsidiary
Guarantor Obligations [Line Items]
Stated Limit	$ 6,562
Value	$ 1,712	[1]
Number of DEI subsidiaries | Subsidiary	2
Minimum
Guarantor Obligations [Line Items]
Annual future contributions	$ 4
Maximum
Guarantor Obligations [Line Items]
Annual future contributions	19
Third Party and Equity Method Investee
Guarantor Obligations [Line Items]
Stated Limit	39
Debt
Guarantor Obligations [Line Items]
Stated Limit	27	[2]
Value	27	[1],[2]
Commodity transactions
Guarantor Obligations [Line Items]
Stated Limit	2,371	[3]
Value	932	[1],[3]
Nuclear obligations
Guarantor Obligations [Line Items]
Stated Limit	184	[4]
Value	75	[1],[4]
Solar
Guarantor Obligations [Line Items]
Stated Limit	1,555	[5]
Value	647	[1],[5]
Other
Guarantor Obligations [Line Items]
Stated Limit	515	[6]
Value	31	[1],[6]
Through 2019 | Third Party and Equity Method Investee
Guarantor Obligations [Line Items]
Stated Limit	55
Virginia Electric and Power Company | Debt
Guarantor Obligations [Line Items]
Stated Limit	14
Millstone | Nuclear obligations
Guarantor Obligations [Line Items]
Stated Limit	150
Kewaunee | Nuclear obligations
Guarantor Obligations [Line Items]
Stated Limit	60
Cove Point
Guarantor Obligations [Line Items]
Stated Limit	$ 150
Number of guarantees with no stated limit | guarantee	2
Number of guarantees | guarantee	1
Aggregate limit for guarantees	$ 1,750
Annual draw limit	175
Cove Point | Nuclear obligations
Guarantor Obligations [Line Items]
Stated Limit	1,910	[7]
Value	$ 0	[1],[7]

[1] Represents the estimated portion of the guarantee's stated limit that is utilized as of December 31, 2015 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 commodity commitments of certain subsidiaries, including subsidiaries of Virginia Power, Dominion Gas 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 (in the event of a prolonged outage) and Kewaunee, respectively, 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] Includes guarantees to facilitate the development of solar projects including guarantees that do not have stated limits. Also includes guarantees entered into by DEI on behalf of certain subsidiaries to facilitate the acquisition and development of solar projects.

[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. As of December 31, 2015, Dominion's maximum remaining cumulative exposure under these equity funding agreements is $55 million through 2019 and its maximum annual future contributions could range from approximately $4 million to $19 million. The value provided includes certain guarantees that do not have stated limits.

[7] Guarantees related to Cove Point, in support of terminal services, transportation and construction. Two of the guarantees have no stated limit, one guarantee has a $150 million limit, and one guarantee has a $1.75 billion aggregate limit with an annual draw limit of $175 million.