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Significant Financing Transactions (Narrative) (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2022 | May 05, 2022 | Jun. 30, 2022 | May 31, 2022 | Apr. 30, 2022 | Jan. 31, 2022 | Aug. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Nov. 30, 2020 | Jul. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [1] |  |  | $ 6,000,000,000 |  |  |  |  | $ 6,000,000,000 |  | $ 6,000,000,000 |  |  |  |  |
Short-term debt |  |  |  | $ 3,080,000,000 |  |  |  |  | $ 3,080,000,000 |  | $ 3,080,000,000 |  | $ 2,314,000,000 | [2] |  |
Preferred stock shares authorized |  |  |  | 20,000,000 |  |  |  |  | 20,000,000 |  | 20,000,000 |  |  |  |  |
Stock purchase contract liability |  |  |  |  |  |  |  |  |  |  |  |  | 44,000,000 |  |  |
Corporate units stock purchase contract liability payments |  |  |  |  |  |  |  |  |  |  | $ 44,000,000 | $ 42,000,000 |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  | 1,701,000,000 | 97,000,000 |  |  |  |
Issuance of stock |  |  |  |  |  |  |  |  | $ 1,758,000,000 | $ 49,000,000 | $ 1,803,000,000 | $ 97,000,000 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Issuance of stock (in shares) |  |  |  | 400,000 | 900,000 |  |  |  | 21,000,000 | 1,000,000 | 22,000,000 | 1,000,000 |  |  |  |
Issuance of stock |  |  |  | $ 30,000,000 | $ 72,000,000 |  |  |  | $ 1,758,000,000 | $ 49,000,000 | $ 1,803,000,000 | $ 97,000,000 |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 | $ 3,000,000,000.0
2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term deposit |  |  |  |  | 2,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |
2019 Series A Corporate Units | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  | 19,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock |  |  |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |
2019 Series A Corporate Units | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term deposit |  |  |  |  | 2,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |
2019 Series A Corporate Units | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term deposit |  |  |  |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded dividend |  |  |  |  |  |  |  |  | $ 5,000,000 | $ 7,000,000 | $ 12,000,000 | $ 14,000,000 |  |  |  |
Recorded dividends per share |  |  |  |  |  |  |  |  | $ 2.917 | $ 4.375 | $ 7.292 | $ 8.750 |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ 2,000,000 |  | $ 2,000,000 |  |  |  |  |
Series A Preferred Stock | 2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded dividend |  |  |  |  |  |  |  |  | $ 9,000,000 | $ 9,000,000 | $ 18,000,000 | $ 18,000,000 |  |  |  |
Recorded dividends per share |  |  |  |  |  |  |  |  | $ 11.625 | $ 11.625 | $ 23.250 | $ 23.250 |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded dividend |  |  |  |  |  |  |  |  | $ 11,000,000 |  | $ 22,000,000 |  |  |  |  |
Recorded dividends per share |  |  |  |  |  |  |  |  | $ 10.875 |  | $ 21.750 |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchased value |  |  |  |  |  |  |  | $ 19,000,000 |  |  |  |  |  |  |  |
Forecast | Series A Preferred Stock | 2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |
Preferred stock dividend rate increase percentage |  | 6.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Various Programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  | $ 91,000,000 | $ 97,000,000 |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 1,000,000 |  |  |  |
Floating Rate Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | 379,000,000 |  |  |  |  | $ 379,000,000 |  | $ 379,000,000 |  | 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 |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | 500,000,000 |  |  |  |  | 500,000,000 |  | 500,000,000 |  |  |  |  |
Questar Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | 250,000,000 |  |  |  |  | 250,000,000 |  | 250,000,000 |  |  |  |  |
Questar Gas Company | Senior Notes Due in 2032 | Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  | $ 125,000,000 |  |  |  |  | $ 125,000,000 |  | $ 125,000,000 |  |  |  |  |
Interest rate percentage |  |  |  | 4.39% |  |  |  |  | 4.39% |  | 4.39% |  |  |  |  |
Debt maturity year |  |  |  | 2032 |  |  |  |  |  |  |  |  |  |  |  |
Questar Gas Company | Senior Notes Due in 2052 | Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  | $ 125,000,000 |  |  |  |  | $ 125,000,000 |  | $ 125,000,000 |  |  |  |  |
Interest rate percentage |  |  |  | 4.70% |  |  |  |  | 4.70% |  | 4.70% |  |  |  |  |
Debt maturity year |  |  |  | 2052 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [3] |  |  | $ 6,000,000,000 |  |  |  |  | $ 6,000,000,000 |  | $ 6,000,000,000 |  |  |  |  |
Short-term debt |  |  |  | $ 725,000,000 |  |  |  |  | $ 725,000,000 |  | $ 725,000,000 |  | $ 745,000,000 | [4] |  |
Interest rate percentage |  |  |  |  |  | 1.65% |  |  |  |  |  |  |  |  |  |
Aggregate outstanding principal |  |  |  |  |  | $ 138,000,000 |  |  |  |  |  |  |  |  |  |
Debt, maturity month and year |  |  |  |  |  | 2024-05 |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 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 | Senior Notes Due in 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |  |
Debt maturity year |  |  |  |  | 2027 |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Senior Notes Due in 2052 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 4.625% |  |  |  |  |  |  |  |  |  |  |
Debt maturity year |  |  |  |  | 2052 |  |  |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  |  | 3,400,000 |  |  |  |  | 3,400,000 |  | 3,400,000 |  | 3,400,000 |  |  |
Preferred stock shares outstanding |  |  |  | 3,400,000 |  |  |  |  | 3,400,000 |  | 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 |  | 1,600,000 |  | 1,600,000 |  |  |
Preferred stock shares outstanding |  |  |  | 1,600,000 |  |  |  |  | 1,600,000 |  | 1,600,000 |  | 1,600,000 |  |  |
Dominion Energy | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  |  | 800,000 |  |  |  |  | 800,000 |  | 800,000 |  | 800,000 |  |  |
Preferred stock shares outstanding |  |  |  | 800,000 |  |  |  |  | 800,000 |  | 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 |  | 1,000,000.0 |  | 1,000,000.0 |  |  |
Preferred stock shares outstanding |  |  |  | 1,000,000.0 |  |  |  |  | 1,000,000.0 |  | 1,000,000.0 |  | 1,000,000.0 |  |  |
Joint Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | $ 6,000,000,000.0 |  |  |  |  | $ 6,000,000,000.0 |  | $ 6,000,000,000.0 |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | 2,000,000,000.0 |  |  |  |  | 2,000,000,000.0 |  | 2,000,000,000.0 |  |  |  |  |
Line of credit facility, extended maturity date |  |  |  |  |  | Jun. 30, 2025 |  |  |  |  |  |  |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | 30,000,000 |  |  |  |  | 30,000,000 |  | 30,000,000 |  |  |  |  |
Credit facility, outstanding amount |  |  |  | 20,000,000 |  |  |  |  | 20,000,000 |  | $ 20,000,000 |  | $ 29,000,000 |  |  |
Line of credit facility, maturity date |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2022 |  |  |  |  |
Letter of Credit | Amended and Restated Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maturity date |  |  |  |  | Jun. 30, 2024 |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | 2,000,000,000.0 |  |  |  |  | $ 2,000,000,000.0 |  | $ 2,000,000,000.0 |  |  |  |  |
Sustainability Revolving Credit Facility | Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 900,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity year |  |  | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Sustainability Revolving Credit Facility | Dominion Energy | Environmental Sustainability And Social Investment Initiatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Sustainability Revolving Credit Facility | Dominion Energy | General Corporate Purposes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |
[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] | 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 June 30, 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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: 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(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 + Details
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