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Commitments and Contingencies (SCANA Legal Proceedings) (Narrative) (Detail) - USD ($) shares in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | May 31, 2022 | Aug. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2018 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sales of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 | $ 27,000,000 | $ (412,000,000)
Gain on sales of assets after tax |  |  |  |  |  |  |  |  | $ 95,000,000 | $ 973,000,000 | $ 483,000,000 | $ 323,000,000 | $ 364,000,000 | $ 694,000,000 | $ 407,000,000 | $ 691,000,000 | $ 1,874,000,000 | 2,156,000,000 | 269,000,000
SCDOR | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain upon completion of remaining transfer of utility properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000 |  |  |  |
Fair value of utility property transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |
Utility Property Transferred | SCDOR | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sales of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |
Gain on sales of assets after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 |
Remaining Utility Property Transferred | SCDOR | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sales of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |
Gain on sales of assets after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000 |
Dominion Energy South Carolina Inc | SCDOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement paid |  |  | $ 51,000,000 |  |  |  | $ 165,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Proposed assessment amount from audit |  |  |  |  |  |  |  | $ 410,000,000 |  |  |  |  |  |  |  |  |  |  |
Proportional share of NND project |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Fair value of certain non-utility property transferred |  | $ 28,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sales of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000
Gain on sales of assets after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,000,000
Fair value of additional utility property transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000
Minimum | Dominion Energy South Carolina Inc | SCDOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial litigation settlement amount through stock issuance |  |  |  |  |  | $ 43,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Dominion Energy South Carolina Inc | SCDOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment for remaining obligation | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utilization of insurance proceeds for settlements |  |  | $ 33,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount through stock issuance |  |  | 0.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA | State Court Derivative Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement paid |  |  |  |  |  | 33,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA | Federal Court Merger Case | State Court Merger Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement paid |  |  |  |  |  | $ 63,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
DESC | Common Stock | Dominion Energy South Carolina Inc | SCDOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial litigation settlement through stock issuance |  |  |  | 0.9 | 0.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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