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Significant Financing Transactions (Narrative) (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2022 | Jul. 31, 2023 | Jun. 30, 2023 | Apr. 30, 2023 | Mar. 31, 2023 | Jan. 31, 2023 | Jun. 30, 2022 | May 31, 2022 | Jun. 30, 2023 | Mar. 31, 2023 | Aug. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Feb. 28, 2023 | Dec. 31, 2022 | Nov. 30, 2020 | Aug. 31, 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 |  |  |  | 4,575,000,000 |  |  |  |  |  | 4,575,000,000 |  |  |  | 4,575,000,000 |  |  | $ 3,423,000,000 | [2] |  |  |
Line of credit issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000,000 |  |  |  |  |  |  |
Supplemental credit facility borrowings |  |  |  | $ 0 |  |  |  |  |  | $ 0 |  |  |  | $ 0 |  |  | 450,000,000 | [2] |  |  |
Preferred stock shares authorized |  |  |  | 20,000,000 |  |  |  |  |  | 20,000,000 |  |  |  | 20,000,000 |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,000,000 | $ 1,701,000,000 |  |  |  |  |  |
Issuance of stock |  |  |  |  |  |  |  |  |  | $ 42,000,000 |  |  | $ 1,758,000,000 | 85,000,000 | $ 1,803,000,000 |  |  |  |  |  |
Securities due within one year |  |  |  | $ 4,349,000,000 |  |  |  |  |  | $ 4,349,000,000 |  |  |  | $ 4,349,000,000 |  |  | 3,341,000,000 | [2] |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  | 400,000 | 900,000 | 1,000,000 |  |  | 21,000,000 | 2,000,000 | 22,000,000 |  |  |  |  |  |
Issuance of stock |  |  |  |  |  |  |  | $ 30,000,000 | $ 72,000,000 | $ 42,000,000 |  |  | $ 1,758,000,000 | $ 85,000,000 | $ 1,803,000,000 |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  | $ 3,000,000,000.0
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded dividend |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  | $ 12,000,000 |  |  |  |  |  |
Recorded dividends per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.917 |  | $ 7.292 |  |  |  |  |  |
Recorded interest expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  | $ 2,000,000 |  |  |  |  |  |
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 |  |  | $ 11,000,000 | $ 22,000,000 | $ 22,000,000 |  |  |  |  |  |
Recorded dividends per share |  |  |  |  |  |  |  |  |  | $ 10.875 |  |  | $ 10.875 | $ 21.750 | $ 21.750 |  |  |  |  |  |
Various Programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,000,000 | $ 91,000,000 |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 1,000,000 |  |  |  |  |  |
At-the-Market Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale agreement expiration month and year |  |  |  |  |  |  |  |  |  |  |  |  |  | 2023-06 |  |  |  |  |  |  |
Floating Rate Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | 403,000,000 |  |  |  |  |  | $ 403,000,000 |  |  |  | $ 403,000,000 |  |  | 347,000,000 |  |  |  |
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 |  |  |  |  |  |  |
DESC | Short-term Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | $ 2,200,000,000 |  |  |  |  | $ 2,200,000,000 |  |  |  |  |  |  |  |  |  |
Questar Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | 250,000,000 |  |  |  |  |  | 250,000,000 |  |  |  | 250,000,000 |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [3] |  |  | 6,000,000,000 |  |  |  |  |  | 6,000,000,000 |  |  |  | 6,000,000,000 |  |  |  |  |  |  |
Aggregate outstanding principal |  |  |  | 160,000,000 |  |  |  |  |  | 160,000,000 |  |  |  | 160,000,000 |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 1,265,000,000 |  |  |  |  |  | $ 1,265,000,000 |  |  |  | $ 1,265,000,000 |  |  | 941,000,000 | [4] |  |  |
Interest rate percentage |  |  |  | 3.65% |  |  |  |  |  | 3.65% |  |  |  | 3.65% |  |  |  |  |  |  |
Debt, maturity month and year |  |  |  | 2027-10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 | 0 | 0 |  |  |  |  |  |
Securities due within one year |  |  |  | $ 379,000,000 |  |  |  |  |  | $ 379,000,000 |  |  |  | $ 379,000,000 |  |  | $ 1,164,000,000 | [4] |  |  |
Virginia Electric and Power Company | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity month and year |  |  |  |  |  | 2023-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in securities due within one year |  |  |  |  |  | $ 448,000,000 |  |  |  |  | 448,000,000 |  |  |  |  |  |  |  |  |  |
Derivative notional value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000,000 |
Virginia Electric and Power Company | Senior Notes Due in 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  |  | $ 750,000,000 |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  | 5.00% |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |
Debt maturity year |  |  |  |  |  |  |  |  |  |  | 2033 |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Senior Notes Due in 2053 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  |  | $ 750,000,000 |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  | 5.45% |  |  |  |  | 5.45% |  |  |  |  |  |  |  |  |  |
Debt maturity year |  |  |  |  |  |  |  |  |  |  | 2053 |  |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  |  | 1,800,000 |  |  |  |  |  | 1,800,000 |  |  |  | 1,800,000 |  |  | 1,800,000 |  |  |  |
Preferred stock shares outstanding |  |  |  | 1,800,000 |  |  |  |  |  | 1,800,000 |  |  |  | 1,800,000 |  |  | 1,800,000 |  |  |  |
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 |  |  |  |
GENCO | Short-term Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | $ 200,000,000 |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |
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 | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  |  |  |  |  |  |  |  | 1.75% |  |  | 1.75% |  |  |  |  |  |  |  |  |
Preferred stock dividend rate increase percentage |  | 6.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 100,000,000 |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  | 0 |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  | 58,000,000 |  |  |  |  |  | 58,000,000 |  |  |  | 58,000,000 |  |  |  |  |  |  |
Letter of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  | 1,000,000 |  |  |  |  |  | 1,000,000 |  |  |  | 1,000,000 |  |  |  |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | 30,000,000 |  |  |  |  |  | 30,000,000 |  |  |  | 30,000,000 |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  | 25,000,000 |  |  |  |  |  | 25,000,000 |  |  |  | $ 25,000,000 |  |  | $ 25,000,000 |  |  |  |
Line of credit facility, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2024 |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | $ 200,000,000 | $ 125,000,000 |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |
Line of credit facility, maturity date |  |  |  |  |  |  | Jan. 31, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60,000,000 |  |  |  |  |  |  |
Sustainability Revolving Credit Agreement | Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity year |  |  |  |  |  | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supplemental credit facility borrowings |  |  |  | 450,000,000 |  |  |  |  |  | 450,000,000 |  |  |  | 450,000,000 |  |  | $ 450,000,000 |  |  |  |
Sustainability Revolving Credit Agreement | Dominion Energy | General Corporate Purposes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
364 Term loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  | $ 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  | $ 1,000,000,000.0 | $ 1,000,000,000.0 |  |  |  | $ 1,000,000,000.0 |  |  |  |  | $ 500,000,000 |  |  |  |  |
Line of credit facility, maturity date |  |  |  |  |  |  | Jan. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities due within one year |  |  |  | $ 2,500,000,000 |  |  |  |  |  | $ 2,500,000,000 |  |  |  | $ 2,500,000,000 |  |  |  |  |  |  |
364 Term loan facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maturity date |  |  | Jul. 24, 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, 2022 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, 2023, 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, 2022 has been derived from the audited Consolidated Balance Sheet at that date.

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