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Short-Term Debt and Credit Agreements (Narrative) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Jan. 31, 2023 | May 31, 2022 | Apr. 30, 2022 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Feb. 28, 2023 | Feb. 27, 2023 | Nov. 30, 2022 | Jul. 31, 2021 | Jun. 30, 2021 | Oct. 31, 2020 | Nov. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [1] |  |  |  |  | $ 6,000,000,000 | $ 6,000,000,000 |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  | $ 3,423,000,000 | $ 2,314,000,000 |  |  |  |  |  |  |
Weighted-average percentage interest rates |  |  |  |  |  | 4.73% | 0.31% |  |  |  |  |  |  |
Letters of credit outstanding, amount | [1] |  |  |  |  | $ 131,000,000 | $ 202,000,000 |  |  |  |  |  |  |
Floating Rate Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  | $ 347,000,000 | $ 431,000,000 |  |  |  |  |  |  |
Weighted-average percentage interest rates |  |  |  |  |  | 4.24% | 1.25% |  |  |  |  |  |  |
Floating Rate Demand Notes | Shelf Registration for Sale of Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000
Debt instrument, maximum principal outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |
Dominion Energy South Carolina Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Short-term indebtedness outstanding |  |  |  |  | $ 2,200,000,000 |  |  |  |  |  |  |  |  |
Debt, maturity month and year |  |  |  |  | 2023-03 |  |  |  |  |  |  |  |  |
Questar Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |
GENCO |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term indebtedness outstanding |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |
Debt, maturity month and year |  |  |  |  | 2023-03 |  |  |  |  |  |  |  |  |
SBL Holdco |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |
Dominion Solar Projects III, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [2] |  |  |  |  | 6,000,000,000 | 6,000,000,000 |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  | $ 941,000,000 | $ 745,000,000 |  |  |  |  |  |  |
Weighted-average percentage interest rates |  |  |  |  |  | 4.68% | 0.26% |  |  |  |  |  |  |
Letters of credit outstanding, amount | [2] |  |  |  |  | $ 140,000,000 | $ 40,000,000 |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000,000 |  |
Revolving Credit Facility | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  | $ 3,000,000,000 |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |
Credit facility, amount borrowed |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Letter of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  |  | Jun. 30, 2022 |  |  |  |  |  |  |  |
Line of credit facility, extended maturity date |  |  |  | Jun. 30, 2025 |  |  |  |  |  |  |  |  |  |
Credit facility, amount borrowed |  |  |  |  |  | $ 25,000,000 | 29,000,000 |  |  |  |  |  |  |
Letter of Credit | Amended And Restated Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  | Jun. 30, 2024 |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | 2,000,000,000 |  |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company | Credit Facility, Maturing in January 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  | Jan. 31, 2026 |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  | $ 1,300,000,000 |  |  |
Credit Facilities Maturing in December 2021 with 1 Year Automatic Renewals Through 2024 | DECP Holdings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  | $ 110,000,000 |  |  |  |  |  |  |
Automatic renewal period |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  | 110,000,000 | $ 110,000,000 |  |  |  |  |  |  |
Letters of credit borrowed, amount |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  |
364-Day Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  | $ 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  | Jan. 01, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, amount borrowed |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
[1] | This credit facility matures in June 2026, with the potential to be extended by the borrowers to June 2028, 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] | The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Questar Gas and DESC. The sub-limit for Virginia Power is set pursuant to the terms of the facility but can be changed at the option of the borrowers multiple times per year. At December 31, 2022, the sub-limit for Virginia Power was $1.75 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 June 2026, with the potential to be extended by the borrowers to June 2028. The credit facility 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.

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