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Commitments and Contingencies (Guarantees, Surety Bonds and Letters of Credit) (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2017 USD ($)
Guarantor Obligations [Line Items] |  |
Maximum Exposure | $ 5,658 | [1]
Nuclear Obligations |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | 227 | [2]
Commodity Transactions |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | 1,934 | [3]
Cove Point |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | 1,900 | [4]
Financial Guarantee | Equity Method Investees |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | 48 |
Financial Guarantee | Affiliate |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | 26 |
Financial Guarantee | Affiliate | Minimum |  |
Guarantor Obligations [Line Items] |  |
Maximum annual future contributions | 4 |
Financial Guarantee | Affiliate | Maximum |  |
Guarantor Obligations [Line Items] |  |
Maximum annual future contributions | 19 |
Solar |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | 1,054 | [5]
Other |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | 543 | [6]
Surety Bond |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | 140 |
Surety Bond | Virginia Electric and Power Company |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | 63 |
Surety Bond | Dominion Energy Gas Holdings, LLC |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | 22 |
Letters of Credit by Financial Institutions |  |
Guarantor Obligations [Line Items] |  |
Maximum Exposure | $ 72 |
[1] | Excludes Dominion Energy's guarantee for the construction of a new corporate office property as discussed in Note 22 to the Consolidated Financial Statements in the Companies' Annual Report on Form 10-K for the year ended December 31, 2016.
[2] | Guarantees related to certain DGI subsidiaries regarding all aspects of running a nuclear facility.
[3] | Guarantees related to commodity commitments of certain subsidiaries. These guarantees were provided to counterparties in order to facilitate physical and financial transaction-related commodities and services.
[4] | Guarantees related to Cove Point, in support of terminal services, transportation and construction.
[5] | Includes guarantees to facilitate the development of solar projects. Also includes guarantees entered into by DGI 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, construction projects and insurance programs. Due to the uncertainty of workers’ compensation claims, the parental guarantee has no stated limit. Also included are guarantees related to certain DGI subsidiaries' obligations for equity capital contributions and energy generation associated with Fowler Ridge and NedPower. As of June 30, 2017, Dominion Energy's maximum remaining cumulative exposure under these equity funding agreements is $26 million through 2019 and its maximum annual future contributions could range from approximately $4 million to $19 million.

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