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Preferred Stock (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2022 | May 31, 2022 | Dec. 31, 2021 | Sep. 30, 2020 | Dec. 31, 2019 | Aug. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Apr. 15, 2027 | Dec. 15, 2024 | Sep. 30, 2022 | Aug. 31, 2021 | Jun. 30, 2019 | Jun. 14, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares authorized |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |
Total Preferred Stock |  |  | $ 1,783 |  |  |  | $ 1,783 | $ 1,783 |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  | 4,100,000 |  |  |  |  |  |  |  |  |  |  |
Debt repurchased value |  |  |  |  |  | $ 154 | 263 |  |  |  |  |  | $ 39 |  |
Dividend stock |  |  |  |  |  |  | $ 93 | $ 68 | $ 65 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  |  |  |  | 0 | 0 | 38,900,000 |  |  |  |  |  |
2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount corporate units |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600
Percentage of interest in undivided beneficial ownership |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
2019 Series A Corporate Units | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price to be paid under stock purchase contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassifications of permanent to mezzanine equity |  |  |  |  |  |  |  | $ 1,600 |  |  |  |  |  |  |
Conversion of stock, description |  |  |  |  |  |  | Series A Preferred Stock be settled, at Dominion Energy’s election, either entirely in cash or in cash up to the first $1,000 per share and in shares of Dominion Energy common stock, cash or any combination thereof for any amounts in excess of $1,000 per share |  |  |  |  |  |  |  |
Debt repurchased value |  |  |  |  |  |  |  |  |  |  |  | $ 1,600 |  |  |
Series A Preferred Stock | 2019 Series A Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate percentage |  | 1.75% |  |  |  | 1.75% |  |  |  |  |  |  |  |  |
Preferred stock dividend rate increase percentage | 6.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share |  |  |  |  | $ 1,020 |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share |  |  | $ 1,020 |  |  |  |  | $ 1,020 |  |  |  |  |  |  |
Series C Preferred Stock | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 3,400,000 |  |  |  | 1,800,000 | 3,400,000 |  |  |  |  |  |  |
Preferred stock shares outstanding |  |  | 3,400,000 |  |  |  | 1,800,000 | 3,400,000 |  |  |  |  |  |  |
Dominion Energy | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 800,000 |  | 800,000 |  | 800,000 | 800,000 |  |  |  |  |  |  |
Preferred stock shares outstanding |  |  | 800,000 |  |  |  | 800,000 | 800,000 |  |  |  |  |  |  |
Total Preferred Stock |  |  |  |  | $ 791 |  |  |  |  |  |  |  |  |  |
Issuance of costs |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation value |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
Dividend rate percentage |  |  |  |  | 4.65% |  | 2.993% |  |  |  |  |  |  |  |
Dividend stock |  |  |  |  |  |  | $ 37 | $ 37 | $ 37 |  |  |  |  |  |
Dividends per share |  |  |  |  |  |  | $ 46.5 | $ 46.5 | $ 46.5 |  |  |  |  |  |
Dominion Energy | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 1,000,000 |  |  |  | 1,000,000 | 1,000,000 |  |  |  |  |  |  |
Preferred stock shares outstanding |  |  | 1,000,000 |  |  |  | 1,000,000 | 1,000,000 |  |  |  |  |  |  |
Issuance of costs |  |  | $ 8 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation value |  |  | $ 1,000 |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Dividend rate percentage |  |  | 4.35% |  |  |  | 3.195% |  |  |  |  |  |  |  |
Dividend stock |  |  |  |  |  |  | $ 44 | $ 3 |  |  |  |  |  |  |
Dividends per share |  |  |  |  |  |  | $ 43.5 | $ 2.6583 |  |  |  |  |  |  |
Preferred stock shares issued to public |  |  | 750,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock value issued to public |  |  | $ 742 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares to qualified benefit pension plan |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Pension plans |  |  | $ 250 |  |  |  |  |  |  |  |  |  |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares authorized |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Held By SCANA |  |  | 1,000 |  |  |  | 1,000 | 1,000 |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares authorized |  |  | 10,000,000 |  |  |  |  | 10,000,000 |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 0 |  |  |  | 0 | 0 |  |  |  |  |  |  |
Preferred stock shares outstanding |  |  | 0 |  |  |  | 0 | 0 |  |  |  |  |  |  |
Liquidation preference |  |  | $ 100 |  |  |  |  | $ 100 |  |  |  |  |  |  |

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