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Commitments and Contingencies (Guarantees, Surety Bonds and Letters of Credit) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Guarantor Obligations [Line Items] |  |  |  |
Facility Limit |  |  | $ 5,500,000,000 | $ 5,500,000,000
Maximum Exposure | [1] |  | 5,771,000,000 |
Cove Point |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure | [2] |  | 1,900,000,000 |
Virginia Electric and Power Company |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Facility Limit | [3] |  | 5,500,000,000 | 5,500,000,000
Dominion Energy Gas Holdings, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Facility Limit | [4] |  | 1,500,000,000 | $ 1,500,000,000
Nuclear Obligations |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure | [5] |  | 227,000,000 |
Commodity Transactions |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure | [6] |  | 2,027,000,000 |
Surety Bond [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 153,000,000 |
Surety Bond [Member] | Virginia Electric and Power Company |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 63,000,000 |
Surety Bond [Member] | Dominion Energy Gas Holdings, LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 24,000,000 |
Financial Standby Letter of Credit [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 76,000,000 |
Debt [Member] | Virginia Electric and Power Company |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 14,000,000 |
Solar |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure | [7] |  | 1,064,000,000 |
Other |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure | [8] |  | 553,000,000 |
Revolving Credit Facility | Atlantic Coast Pipeline | Financial Guarantee [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Facility Limit |  | $ 3,400,000,000 | 3,400,000,000 |
Revolving credit facility stated maturity date |  | Oct. 31, 2021 |  |
Maximum potential loss exposure, limited guarantee percentage |  | 48.00% |  |
Guarantee liability |  |  | 28,000,000 |
Guarantee recorded amount |  |  | 664,000,000 |
Equity Method Investee [Member] | Financial Guarantee [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 48,000,000 |
Affiliated Entity | Financial Guarantee [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum Exposure |  |  | 17,000,000 |
Minimum | Affiliated Entity | Financial Guarantee [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum annual future contributions |  |  | 4,000,000 |
Maximum | Affiliated Entity | Financial Guarantee [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Maximum annual future contributions |  |  | $ 14,000,000 |
[1] | Excludes Dominion Energy's guarantee for the construction of the new corporate office property discussed further within Lease Commitments above.
[2] | 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.
[3] | The full amount of the facilities is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas and Questar Gas. Sub-limits for Virginia Power are set within the facility limit but can be changed at the option of the Companies multiple times per year. At December 31, 2017, the sub-limit for Virginia Power was an aggregate $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. These facilities mature in April 2020, 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.
[4] | A maximum of a combined $1.5 billion of the facilities 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. Sub-limits for Dominion Energy Gas are set within the facility limit but can be changed at the option of the Companies multiple times per year. At December 31, 2017, the sub-limit for Dominion Energy Gas was an aggregate $500 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. These credit facilities mature in April 2020 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.
[5] | Guarantees related to certain DGI subsidiaries' regarding all aspects of running a nuclear facility.
[6] | 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.
[7] | 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.
[8] | 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, 2017, Dominion Energy's maximum remaining cumulative exposure under these equity funding agreements is $17 million through 2019 and its maximum annual future contributions could range from approximately $4 million to $14 million.

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- Definition Guarantee obligations maximum potential loss exposure guarantee limited percentage. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913245&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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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