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Commitments and Contingencies (Narrative) (Detail) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2024 | Oct. 31, 2020 | Apr. 30, 2017 Petition | Aug. 31, 2016 T | Sep. 30, 2025 USD ($) Indicator Facility Site gal | Dec. 31, 2024 USD ($)
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 |
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 |  |  |  |  | 14 |
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 |  |  |
Loss contingencies facility retirement period | 2034 |  |  |  |  |
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 | 2029 | 2028 |  |  |  |
CWA | Unfavorable Regulatory Action | Virginia Electric and Power Company |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of facilities that are subject to final regulations | Facility |  |  |  |  | 8 |
Waste Management and Remediation | Unfavorable Regulatory Action | EPA |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of sites remediation work substantially completed | Site |  |  |  |  | 4 |
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 | $ |  |  |  |  | $ 53 | $ 56
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 | $ |  |  |  |  | $ 48 | 50
Other Legal Matters | East Ohio |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Offsetting reserve and insurance receivable | $ |  |  |  |  |  | $ 30

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