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Commitments and Contingencies (Narrative) (Detail) shares in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jul. 31, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | May 31, 2022 shares | Aug. 31, 2021 shares | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Oct. 31, 2020 | Jun. 30, 2018 USD ($) | Apr. 30, 2017 Petition | Aug. 31, 2016 T | Mar. 31, 2024 USD ($) Indicator Facility Site gal | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sales of assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 | $ 2,000,000 |  |  |
Gain on sales of assets after tax |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 560,000,000 | 700,000,000 |  |  |
Nuclear Obligations | Secondary Financial Protection Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum liability protection per nuclear incident amount | $ 16,300,000,000 | $ 16,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | EPA and State Regulatory Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities to assess the applicability of section 316(b) | Facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Hydroelectric Facilities | EPA and State Regulatory Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities to assess the applicability of section 316(b) | Facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of utility property transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |
Gain upon completion of remaining transfer of utility properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000 |
Fair value of additional utility property transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000
Dominion Energy South Carolina Inc | DESC | SCDOR | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial litigation settlement through stock issuance | shares |  |  |  |  |  | 0.9 | 0.6 |  |  |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | Utility Property Transferred | SCDOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sales of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  |  |
Gain on sales of assets after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  |  |
Dominion Energy South Carolina Inc | Minimum | SCDOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial litigation settlement amount through stock issuance |  |  |  |  |  |  |  | $ 43,000,000 |  |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | Maximum | SCDOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment for remaining obligation |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generating station facilities water withdrawals per day | gal |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |
Electric generating station facilities heightened entrainment analysis per day | gal |  |  |  |  |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |
Carbon Regulations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities Significant Emission Rate Per Year CO2 Equivalent | T |  |  |  |  |  |  |  |  |  |  |  |  | 75,000 |  |  |  |  |
CWA | Unfavorable Regulatory Action |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mandatory facility-specific factors | Indicator |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Number of optional facility-specific factors | Indicator |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |
Number of facilities that are subject to final regulations | Facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |
CWA | Unfavorable Regulatory Action | EPA | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of separate petitions for reconsideration granted | Petition |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
CWA | Unfavorable Regulatory Action | EPA | Minimum | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingencies individual circumstances period |  |  |  |  |  |  |  |  |  | 2021 |  |  |  |  |  |  |  |
CWA | Unfavorable Regulatory Action | EPA | Maximum | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingencies individual circumstances period |  |  |  |  |  |  |  |  |  | 2028 |  |  |  |  |  |  |  |
CWA | Unfavorable Regulatory Action | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities that are subject to final regulations | Facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  |  |
Waste Management and Remediation | Unfavorable Regulatory Action | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sites remediation work substantially completed | Site |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |
Number of additional sites which are not under investigation | Site |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Waste Management and Remediation | Unfavorable Regulatory Action | EPA | Former Gas Plant Site With Post Closure Groundwater Monitoring Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation reserves |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,000,000 |  | $ 32,000,000 |  |
Waste Management and Remediation | Unfavorable Regulatory Action | Virginia Electric and Power Company | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sites with remediation plans | Site |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Number of additional sites which are not under investigation | Site |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Waste Management and Remediation | Unfavorable Regulatory Action | Virginia Electric and Power Company | EPA | Former Gas Plant Site With Post Closure Groundwater Monitoring Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation reserves |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  | 25,000,000 |  |
Millstone, Summer, Surry and North Anna |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of coverage purchased from commercial insurance pools | $ 500,000,000 | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  | $ 450,000,000 |  |

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