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Commitments and Contingencies (Guarantees, Surety Bonds and Letters of Credit) (Detail) - USD ($) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Guarantee Obligations [Line Items] |  |  |  |  |
Facility Limit | [1] |  | $ 6,000,000,000 |  |
Additional amount borrowed |  |  |  | $ 73,000,000 |
Maximum Exposure | [2] |  | 5,663,000,000 |  |
Commodity Transactions |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Maximum Exposure | [3] |  | 2,517,000,000 |  |
Nuclear Obligations |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Maximum Exposure | [4] |  | 204,000,000 |  |
Cove Point |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Maximum Exposure | [5] |  | 1,900,000,000 |  |
Virginia Electric and Power Company |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Facility Limit | [6] |  | 6,000,000,000 |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Facility Limit | [7] |  | 1,500,000,000 |  |
Financial Guarantee [Member] | Equity Method Investee [Member] |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 27,000,000 |  |
Financial Guarantee [Member] | Atlantic Coast Pipeline | Revolving Credit Facility |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Facility Limit |  |  | $ 3,400,000,000 |  |
Maximum potential loss exposure, limited guarantee percentage |  |  | 48.00% |  |
Guarantee liability |  |  | $ 15,000,000 |  | $ 21,000,000
Guarantee recorded amount |  |  | 1,700,000,000 |  |
Financial Guarantee [Member] | Subsequent Event | Atlantic Coast Pipeline | Revolving Credit Facility |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Additional amount borrowed |  | $ 41,000,000 |  |  |
Solar |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Maximum Exposure | [8] |  | 652,000,000 |  |
Other |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Maximum Exposure | [9] |  | 390,000,000 |  |
Surety Bond [Member] |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 185,000,000 |  |
Surety Bond [Member] | Virginia Electric and Power Company |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 81,000,000 |  |
Surety Bond [Member] | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | 26,000,000 |  |
Financial Standby Letter of Credit [Member] |  |  |  |  |
Guarantee Obligations [Line Items] |  |  |  |  |
Maximum Exposure |  |  | $ 81,000,000 |  |
[1] | This credit facility matures in March 2023 and can be used by the borrowers under the credit facility 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 new corporate office property discussed in Note 22 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2018 and guarantees for debt of certain subsidiaries discussed in Note 17.
[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 primarily related to certain DGI subsidiaries regarding all aspects of running a nuclear facility.
[5] | 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.
[6] | The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas, Questar Gas and DESC. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At September 30, 2019, 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.
[7] | 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, Questar Gas and DESC. The sub-limit for Dominion Energy Gas is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At September 30, 2019, 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.
[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 workers’ compensation claims, the parental guarantee has no stated limit.

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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