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Equity (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2024 | May 31, 2024 | Jul. 31, 2023 | Apr. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | May 31, 2022 | Nov. 30, 2021 | Aug. 31, 2020 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2024 | Aug. 31, 2024 | Nov. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  | $ 732,000,000 | $ 94,000,000 | $ 1,866,000,000 |  |  |
Issuance of stock to Dominion Energy |  |  |  |  |  |  |  |  |  |  | 732,000,000 | 94,000,000 | 1,969,000,000 |  |  |
Compensation cost related to stock-based compensation |  |  |  |  |  |  |  |  |  |  | 53,000,000 | 44,000,000 | 36,000,000 |  |  |
Tax benefit from stock awards and stock options exercised |  |  |  |  |  |  |  |  |  |  | $ 12,000,000 | 10,000,000 | 7,000,000 |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Cash Based Performance Grant | Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash-based performance grants minimum percentage |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |
Cash-based performance grants maximum percentage |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  |  |
February 2020 Cash Based Performance Grant | Officer | Grant Date Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted amount of the grant |  |  |  |  |  |  |  |  |  | $ 4,000,000 |  | 4,000,000 |  |  |  |
February 2022 Cash Based Performance Grant | Officer | Grant Date Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted amount of the grant | $ 5,000,000 |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |
February 2023 Cash Based Performance Grant | Officer | Grant Date Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted amount of the grant | 15,000,000 |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |
Liability accrued for award | 11,000,000 |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |
February 2024 Cash Based Performance Grant | Officer | Grant Date Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted amount of the grant | 26,000,000 |  |  |  |  |  |  |  |  |  | 26,000,000 |  |  |  |  |
Liability accrued for award | $ 8,000,000 |  |  |  |  |  |  |  |  |  | $ 8,000,000 |  |  |  |  |
Stock Based Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares were available for future grants | 27,000,000 |  |  |  |  |  |  |  |  |  | 27,000,000 |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to nonvested awards | $ 70,000,000 |  |  |  |  |  |  |  |  |  | $ 70,000,000 |  |  |  |  |
Fair value of restricted stock awards that vested |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 | $ 20,000,000 | $ 31,000,000 |  |  |
Maximum | Stock Based Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum term of stock based awards |  |  |  |  |  |  |  |  |  |  | 8 years |  |  |  |  |
Weighted average | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected weighted-average period recognized for the unrecognized compensation cost |  |  |  |  |  |  |  |  |  |  | 2 years 1 month 6 days |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  | 400,000 | 900,000 |  |  |  | 14,000,000 | 2,000,000 | 25,000,000 |  |  |
Issuance of stock to Dominion Energy |  |  |  |  |  | $ 30,000,000 | $ 72,000,000 |  |  |  | $ 732,000,000 | $ 94,000,000 | $ 1,969,000,000 |  |  |
Stock repurchased, shares |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |
Stock repurchase program, authorized amount | 900,000,000 |  |  |  |  |  |  |  |  |  | $ 900,000,000 |  |  |  |  | $ 1,000,000,000
2019 Series A Corporate Units | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  | 19,400,000 |  |  |  |  |  |  |  |  |  |
Dominion Energy Direct |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  | $ 138,000,000 | $ 94,000,000 | $ 179,000,000 |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  |  | 2,700,000 | 1,700,000 | 2,400,000 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  | $ 3,250,000,000 | $ 0 | $ 3,250,000,000 | $ 0 |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Issuance of stock to Dominion Energy |  |  |  |  |  |  |  |  |  |  |  | $ 3,250,000,000 |  |  |  |
Virginia Electric and Power Company | Virginia Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalization ratio |  |  | 52.10% | 52.10% |  |  |  |  |  | 52.10% |  |  |  |  |  |
Virginia Electric and Power Company | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  | 49,522 |  | 49,000 |  |  |  |
Issuance of stock to Dominion Energy |  |  |  |  |  |  |  |  |  |  |  | $ 3,250,000,000 |  |  |  |
Various Programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  | $ 732,000,000 | $ 94,000,000 | $ 2,000,000,000 |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  |  | 14,000,000 | 2,000,000 | 25,000,000 |  |  |
Sales Agency Agreements to Effect Sales Under At-the-market Program | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock authorized amount |  | $ 1,800,000,000 |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |
Forward Sale Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock | $ 594,000,000 |  |  |  | $ 78,000,000 |  |  |  |  |  |  |  |  |  |  |
Forward sale agreements, number of shares of common stock to be settled |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  | 9,700,000 | 11,400,000 |
Weighted average initial forward price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 57.78 | $ 53.23 |
Initial forward price of share |  |  |  |  |  |  |  | $ 74.66 |  |  |  |  |  |  |  |
Forward Sale Agreements | Weighted average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average final forward price | $ 52.2 |  |  |  |  |  |  |  |  |  | $ 52.2 |  |  |  |  |

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