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Commitments and Contingencies (Guarantees, Surety Bonds and Letters of Credit) (Detail) - USD ($) | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2017 | Feb. 28, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Guarantor Obligations [Line Items] |  |  |  |  |  |
Facility Limit |  |  |  | $ 6,000,000,000 | [1] | $ 5,500,000,000
Maximum Exposure | [2] |  |  | 5,344,000,000 |  |
Revolving Credit Facility |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Guarantee recorded amount |  |  |  | 0 |  |
Cove Point |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure | [3] |  |  | 1,900,000,000 |  |
Virginia Electric and Power Company |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Facility Limit |  |  |  | 6,000,000,000 | [4] | 5,500,000,000
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Facility Limit |  |  |  | 1,500,000,000 | [5] | 1,500,000,000
Nuclear Obligations |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure | [6] |  |  | 179,000,000 |  |
Commodity Transactions |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure | [7] |  |  | 2,186,000,000 |  |
Financial Guarantee [Member] | Revolving Credit Facility | Atlantic Coast Pipeline |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Facility Limit |  | $ 3,400,000,000 |  |  |  |
Revolving credit facility stated maturity date |  | Oct. 31, 2021 |  |  |  |
Maximum potential loss exposure, limited guarantee percentage |  | 48.00% |  |  |  |
Guarantee liability |  |  |  | 21,000,000 |  | $ 28,000,000
Guarantee recorded amount |  |  |  | 1,400,000,000 |  |
Additional borrowing |  |  | $ 113,000,000 |  |  |
Financial Guarantee [Member] | Equity Method Investee [Member] |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  |  |  | 48,000,000 |  |
Solar |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure | [8] |  |  | 659,000,000 |  |
Other |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure | [9] |  |  | 420,000,000 |  |
Surety Bond [Member] |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  |  |  | 171,000,000 |  |
Surety Bond [Member] | Virginia Electric and Power Company |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  |  |  | 72,000,000 |  |
Surety Bond [Member] | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  |  |  | 35,000,000 |  |
Financial Standby Letter of Credit [Member] |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum Exposure |  |  |  | 88,000,000 |  |
Minimum | Financial Guarantee [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum annual future contributions |  |  |  | 4,000,000 |  |
Maximum | Financial Guarantee [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |
Maximum annual future contributions |  |  |  | $ 4,000,000 |  |
[1] | This credit facility matures in March 2023 and can be used by the Companies to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2] | Excludes Dominion Energy’s guarantee for the construction of the new corporate office property discussed further within Lease Commitments above.
[3] | Guarantees related to Cove Point, in support of terminal services, transportation and construction. Cove Point has two guarantees that have no maximum limit and, therefore, are not included in this amount.
[4] | The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas and Questar Gas. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the Companies multiple times per year. At December 31, 2018, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.
[5] | A maximum of $1.5 billion of the facility is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power and Questar Gas. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the Companies multiple times per year. At December 31, 2018, the sub-limit for Dominion Energy Gas was $750 million. If Dominion Energy Gas has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit.
[6] | Guarantees related to certain DGI subsidiaries’ regarding all aspects of running a nuclear facility.
[7] | 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.
[8] | 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.
[9] | Guarantees related to other miscellaneous contractual obligations such as leases, environmental obligations, construction projects and insurance programs. Due to the uncertainty of worker’s 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 December 31, 2018, Dominion Energy’s maximum remaining cumulative exposure under these equity funding agreements is $4 million through 2019 and its maximum annual future contribution is approximately $4 million.

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