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Commitments and Contingencies (SCANA Legal Proceedings) (Narrative) (Detail) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jul. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | May 31, 2022 | Aug. 31, 2021 | Jul. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2018 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 307 | $ 1,401 | $ 194
Gain on sales of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 | (426) | (415)
Gain on sales of assets after tax |  |  |  |  |  |  |  |  |  | $ 344 | $ 698 | $ 415 | $ 700 | $ 222 | $ 585 | $ (659) | $ 279 | 2,157 | 427 | 2,061
SCDOR | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain upon completion of remaining transfer of utility properties |  |  |  |  |  |  |  |  |  |  |  | $ 11 |  |  |  |  |  |  |  |
Fair value of utility property transferred |  |  |  |  |  |  |  |  |  |  |  |  | $ 10 |  |  |  |  |  |  |
Utility Property Transferred | SCDOR | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sales of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  |
Gain on sales of assets after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |
Remaining Utility Property Transferred | SCDOR | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sales of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |
Gain on sales of assets after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8 |  |
Dominion Energy South Carolina Inc | SCDOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement paid |  |  | $ 51 |  |  |  |  | $ 165 |  |  |  |  |  |  |  |  |  |  |  |
Proposed assessment amount from audit |  |  |  |  |  |  |  |  | $ 410 |  |  |  |  |  |  |  |  |  |  |
Proportional share of NND project |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Fair value of certain non-utility property transferred |  | $ 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sales of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 |
Gain on sales of assets after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |
Fair value of additional utility property transferred |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  | 3 |
Minimum | Dominion Energy South Carolina Inc | SCDOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial litigation settlement amount through stock issuance |  |  |  |  |  |  | $ 43 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Dominion Energy South Carolina Inc | SCDOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment For Remaining Obligation | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100
Impairment of assets and other charges, after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75
Utilization of insurance proceeds for settlements |  |  | $ 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount through stock issuance |  |  | 0.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for SCANA legal proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  | 94 |  |  |  |  | 94 |
SCANA | Other Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivables |  |  |  |  |  |  |  |  |  |  |  |  |  | 68 |  |  |  |  | 68 |
SCANA | Personal Injury or Wrongful Death Cases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for SCANA legal proceedings |  |  |  |  |  |  |  |  |  |  |  |  |  | 68 |  |  |  |  | 68 |
Insurance receivables |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 68 |  |  |  |  | $ 68 |
SCANA | State Court Derivative Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement paid |  |  |  |  |  |  | 33 |  |  |  |  |  |  |  |  |  |  |  |  |
SCANA | Federal Court Merger Case | State Court Merger Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement paid |  |  |  |  |  |  | $ 63 |  |  |  |  |  |  |  |  |  |  |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement expense |  |  |  |  |  | $ 99 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DESC | Common Stock | Dominion Energy South Carolina Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement through stock issuance |  |  |  |  |  | 1.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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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