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Short-Term Debt and Credit Agreements (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Parenthetical) (Detail) - USD ($) | Dec. 31, 2019 | Feb. 28, 2019 | Dec. 31, 2018
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Line of Credit Facility [Line Items] |  |  |  |
Weighted-average percentage interest rates | [1],[2],[3] | 1.65% |  |
Facility Limit | [4] | $ 6,000,000,000 |  | $ 6,000,000,000
Virginia Electric and Power Company |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit | [5] | 6,000,000,000 |  | 6,000,000,000
Dominion Energy Gas Holdings, LLC |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit | [6] | 1,500,000,000 |  | $ 1,500,000,000
Credit Facility One Point Five Billion [Member] | Dominion Energy Gas Holdings, LLC |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  | 1,500,000,000 |  |
Letter of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  |  | $ 21,000,000 |
Letter of Credit | Dominion Energy Gas Holdings, LLC |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  | 1,500,000,000 |  |
Letter of Credit | 5 Billion, 500 Million And 6 Billion joint Revolving Credit Facilities [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  | 2,000,000,000.0 |  |
Letter of Credit | Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Virginia Electric and Power Company |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  | 1,500,000,000 |  |
Letter of Credit | Six Billion Joint Revolving Credit Facility | Virginia Electric and Power Company |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  | 2,000,000,000.0 |  |
Line of Credit | Dominion Energy Gas Holdings, LLC |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  | $ 750,000,000 |  |
Commercial Paper | 5 Billion, 500 Million And 6 Billion joint Revolving Credit Facilities [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Weighted-average percentage interest rates |  | 2.10% |  | 2.93%
Commercial Paper | 5 Billion, 500 Million And 6 Billion joint Revolving Credit Facilities [Member] | Virginia Electric and Power Company |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Weighted-average percentage interest rates |  | 2.10% |  | 2.94%
Commercial Paper | 1 Billion, 500 Million And 1.5 Billion Joint Revolving Credit Facilities [Member] | Dominion Energy Gas Holdings, LLC |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Weighted-average percentage interest rates |  | 1.98% |  | 2.58%
[1] | In May 2019, GENCO redeemed its 5.49% senior secured notes due in 2024 at the remaining principal outstanding of $33 million plus accrued interest. In June 2019, the first mortgage lien on an electric generating facility that previously secured these notes was released.
[2] | Industrial revenue bonds totaling $68 million are secured by letters of credit that expire, subject to renewal, in the fourth quarter of 2020.
[3] | Represents weighted-average coupon rates for debt outstanding as of December 31, 2019.
[4] | 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.
[5] | 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 December 31, 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.
[6] | 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 December 31, 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.

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