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Significant Financing Transactions (Narrative) (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2022 | May 05, 2022 | Jun. 30, 2022 | May 31, 2022 | Apr. 30, 2022 | Jan. 31, 2022 | Aug. 31, 2022 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Nov. 30, 2020 | Jul. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [1] |  |  |  |  |  |  |  | $ 6,000,000,000 |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  |  | $ 2,548,000,000 |  | $ 2,314,000,000 | [2] |  |
Preferred stock shares authorized |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |
Stock purchase contract liability |  |  |  |  |  |  |  |  | $ 22,000,000 |  | 44,000,000 |  |  |
Corporate units stock purchase contract liability payments |  |  |  |  |  |  |  |  | 22,000,000 | $ 21,000,000 |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  | 45,000,000 | 48,000,000 |  |  |  |
Issuance of stock |  |  |  |  |  |  |  |  | $ 45,000,000 | 48,000,000 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |
Issuance of stock |  |  |  |  |  |  |  |  | $ 45,000,000 | 48,000,000 |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 | $ 3,000,000,000.0
2019 Series A Corporate Units | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period for conversion, value |  |  |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |
2019 Series A Corporate Units | Maximum | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to be issued under purchase contracts |  |  |  | 21,800,000 |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded dividend |  |  |  |  |  |  |  |  | $ 7,000,000 | $ 7,000,000 |  |  |  |
Recorded dividends per share |  |  |  |  |  |  |  |  | $ 4.375 | $ 4.375 |  |  |  |
Series A Preferred Stock | 2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock | 2019 Series A Corporate Units | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |
Preferred stock dividend rate increase percentage |  | 6.75% |  |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded dividend |  |  |  |  |  |  |  |  | $ 9,000,000 | $ 9,000,000 |  |  |  |
Recorded dividends per share |  |  |  |  |  |  |  |  | $ 11.625 | $ 11.625 |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded dividend |  |  |  |  |  |  |  |  | $ 11,000,000 |  |  |  |  |
Recorded dividends per share |  |  |  |  |  |  |  |  | $ 10,875,000 |  |  |  |  |
Various Programs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  | $ 45,000,000 | $ 48,000,000 |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |
Various Programs | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |
Floating Rate Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  |  | $ 473,000,000 |  | 431,000,000 |  |  |
Floating Rate Demand Notes | Shelf Registration for Sale of Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  | 3,000,000,000.0 |  |  |
Subsequent Event | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |
Issuance of stock |  |  |  |  | $ 72,000,000 |  |  |  |  |  |  |  |  |
Subsequent Event | 2019 Series A Corporate Units | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term deposit |  |  | $ 2,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 2019 Series A Corporate Units | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term deposit |  |  | 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  | 500,000,000 |  |  |  |  |
Questar Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  | 250,000,000 |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [3] |  |  |  |  |  |  |  | 6,000,000,000 |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  |  | $ 686,000,000 |  | $ 745,000,000 | [4] |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Virginia Electric and Power Company | Senior Notes Due in 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  | 2.40% |  |  |  |  |  |  |
Debt maturity year |  |  |  |  |  |  | 2032 |  |  |  |  |  |  |
Virginia Electric and Power Company | Senior Notes Due in 2051 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  | 2.95% |  |  |  |  |  |  |
Debt maturity year |  |  |  |  |  |  | 2051 |  |  |  |  |  |  |
Virginia Electric and Power Company | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  | 1.65% |  |  |  |  |  |  |  |
Aggregate outstanding principal |  |  |  |  |  | $ 138,000,000 |  |  |  |  |  |  |  |
Debt, maturity month and year |  |  |  |  |  | 2024-05 |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  |  |  |  |  |  |  | 3,400,000 |  | 3,400,000 |  |  |
Preferred stock shares outstanding |  |  |  |  |  |  |  |  | 3,400,000 |  | 3,400,000 |  |  |
Dominion Energy | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  |  |  |  |  |  |  | 1,600,000 |  | 1,600,000 |  |  |
Preferred stock shares outstanding |  |  |  |  |  |  |  |  | 1,600,000 |  | 1,600,000 |  |  |
Dominion Energy | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  |  |  |  |  |  |  | 800,000 |  | 800,000 |  |  |
Preferred stock shares outstanding |  |  |  |  |  |  |  |  | 800,000 |  | 800,000 |  |  |
Dominion Energy | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  |  |  |  |  |  |  | 1,000,000.0 |  | 1,000,000.0 |  |  |
Preferred stock shares outstanding |  |  |  |  |  |  |  |  | 1,000,000.0 |  | 1,000,000.0 |  |  |
New Joint Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  | $ 6,000,000,000.0 |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  | 2,000,000,000.0 |  |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  | 30,000,000 |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  |  |  |  | $ 20,000,000 |  | $ 29,000,000 |  |  |
Line of credit facility, maturity date |  |  |  |  |  |  |  |  | Jun. 30, 2022 |  |  |  |  |
Letter of Credit | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, extended maturity date |  |  |  |  |  | Jun. 30, 2025 |  |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  | $ 2,000,000,000.0 |  |  |  |  |
Sustainability Revolving Credit Facility | Virginia Electric and Power Company | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 900,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt maturity year |  |  | 2024 |  |  |  |  |  |  |  |  |  |  |
[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] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | 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 March 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.
[4] | Virginia Power’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.

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