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Long-Term Debt (Narrative) (Detail) - USD ($) | 1 Months Ended | 5 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2024 | Oct. 31, 2024 | May 31, 2024 | Aug. 31, 2020 | Jun. 30, 2020 | May 31, 2024 | Jan. 31, 2025 | Dec. 31, 2024 | Feb. 29, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Aug. 31, 2022 | Aug. 31, 2021 | Oct. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, redeemed remaining principal outstanding |  |  |  |  |  |  |  | $ 144,000,000 |  |  |  | $ 154,000,000 | $ 39,000,000 |
Period of deferral |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Other long-term debt |  |  |  |  |  |  |  | 214,000,000 |  | $ 192,000,000 |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term debt |  |  |  |  |  |  |  | $ 110,000,000 |  | $ 72,000,000 |  |  |  |
Dominion Energy | 2024 Series A JSN |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  | 6.875% |  |  | 6.875% |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  |  |  | 2055 |  |  |  |  |  |  |  |
Interest reset period |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  |  | us-gaap:UsTreasuryUstInterestRateMember |  |  |  |  |  |  |  |
Interest rate spread |  |  |  |  |  | 2.386% |  |  |  |  |  |  |  |
Interest rate minimum reset |  |  | 6.875% |  |  | 6.875% |  |  |  |  |  |  |  |
Dominion Energy | 2024 Series B JSN |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  | 7.00% |  |  | 7.00% |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  |  |  | 2054 |  |  |  |  |  |  |  |
Interest reset period |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  |  | us-gaap:UsTreasuryUstInterestRateMember |  |  |  |  |  |  |  |
Interest rate spread |  |  | 2.511% |  |  |  |  |  |  |  |  |  |  |
Interest rate minimum reset |  |  | 7.00% |  |  | 7.00% |  |  |  |  |  |  |  |
Dominion Energy | 2024 Series C JSN |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes | $ 1,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage | 6.625% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  |  |  | 2055 |  |  |  |  |  |  |  |
Period of deferral | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Interest reset period | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:UsTreasuryUstInterestRateMember |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread | 2.207% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional value |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |
Derivative maturity month and year |  |  |  |  | 2024-12 |  |  |  |  |  |  |  |  |
Other long-term debt |  |  |  | $ 443,000,000 | $ 326,000,000 |  |  |  |  |  |  |  |  |
Derivative imputed interest rate |  |  |  |  | 1.19% |  |  |  |  |  |  |  |  |
Interest Rate Swap | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, redeemed remaining principal outstanding |  |  |  |  |  |  |  |  |  |  | $ 448,000,000 |  |  |
Derivative notional value |  |  |  | $ 900,000,000 |  |  |  |  |  |  |  |  |  |
Derivative maturity month and year |  |  |  | 2023-12 |  |  |  |  |  |  |  |  |  |
Derivative maturity year |  |  |  | 2020 |  |  |  |  |  |  |  |  |  |
Derivative imputed interest rate |  |  |  | 0.34% |  |  |  |  |  |  |  |  |  |
Junior Subordinated Debt | Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  | $ 2,000,000,000 |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |
Debt, redeemed remaining principal outstanding |  | $ 685,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  | 2054 |  |  |  |  |  |  |  |  |  |  |  |
Early redemption charges paid |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Early redemption charges paid after tax |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Junior Subordinated Debt | Dominion Energy | 2024 Series A JSN |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  | 1,000,000,000 |  |  | 1,000,000,000 |  |  |  |  |  |  |  |
Junior Subordinated Debt | Dominion Energy | 2024 Series B JSN |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  | $ 1,000,000,000 |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |
October 2014 Hybrids | Junior Subordinated Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 685,000,000
Interest rate percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.75%
Senior Secured Deferred Fuel Cost Bonds due in May 2029 | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  |  |  | 5.088% |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 439,000,000 |  |  |  |  |
Senior Secured Deferred Fuel Cost Bonds due in May 2033 | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  |  |  | 4.877% |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 843,000,000 |  |  |  |  |
First Mortgage Bonds Due in 2035 | Subsequent Event | DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  | 5.30% |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |

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