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Preferred Stock (Narrative) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 15, 2024 | Jun. 30, 2019 | Jun. 14, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock shares authorized |  |  | 20,000,000 |  |  |  |
Total Preferred Stock |  | $ 2,387,000,000 | $ 2,387,000,000 | $ 2,387,000,000 |  |  |
Dividend stock |  |  | 65,000,000 | $ 17,000,000 |  |  |
Preferred stock, redemption price per share |  | $ 1,020 |  | $ 1,020 |  |  |
Forecast |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, redemption price per share |  |  |  |  | $ 1,000 |  |
2019 Series A Corporate Units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 1,600,000,000
Percentage of interest in undivided beneficial ownership |  |  |  |  |  | 10.00% |
2019 Series A Corporate Units | Forecast | Maximum |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares to be issued under purchase contracts | 21,800,000 |  |  |  |  |  |
2019 Series A Corporate Units | Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Purchase price to be paid under stock purchase contracts |  |  |  |  |  |  | $ 100
Dominion Energy |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend rate percentage |  | 2.993% |  |  |  |  |
Dividend stock |  |  | $ 37,000,000 | $ 2,000,000 |  |  |
Dominion Energy | Preferred Class A |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock shares issued |  | 2,400,000 | 2,400,000 | 2,400,000 |  |  |
Preferred stock shares outstanding |  | 2,400,000 | 2,400,000 | 2,400,000 |  |  |
Dominion Energy | Series A Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock shares issued |  | 1,600,000 | 1,600,000 | 1,600,000 |  |  |
Preferred stock shares outstanding |  | 1,600,000 | 1,600,000 | 1,600,000 |  |  |
Dominion Energy | Series B Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock shares authorized |  | 800,000 |  | 800,000 |  |  |
Preferred stock shares issued |  | 800,000 | 800,000 | 800,000 |  |  |
Preferred stock shares outstanding |  | 800,000 | 800,000 | 800,000 |  |  |
Total Preferred Stock |  | $ 791,000,000 |  | $ 791,000,000 |  |  |
Issuance of costs |  | 9,000,000 |  |  |  |  |
Preferred stock liquidation value |  | $ 1,000 |  | $ 1,000 |  |  |
Dividend rate percentage |  | 4.65% |  |  |  |  |
Dividends per share |  |  | $ 46.50 | $ 1.9375 |  |  |
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 |  |  |  |
Preferred stock shares issued |  | 0 | 0 | 0 |  |  |
Preferred stock shares outstanding |  | 0 | 0 | 0 |  |  |
Liquidation preference |  |  | $ 100 |  |  |  |

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