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Commitments and Contingencies (Environmental Matters) (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2020 | Apr. 30, 2017 Petition | Aug. 31, 2016 T | Jun. 30, 2022 Site | Dec. 31, 2023 USD ($) Indicator Site Facility gal | Dec. 31, 2022 USD ($)
Unfavorable Regulatory Action | EPA |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Electric generating stations with 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 |  |  |  |
Waste Management and Remediation | Unfavorable Regulatory Action | EPA |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of sites remediation work substantially completed |  |  |  |  | 14 |
Number of sites with remediation plans |  |  |  | 1 |  |
Number of additional sites which are not under investigation |  |  |  |  | 12 |
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 | $ |  |  |  |  | $ 32 | $ 47
Minimum | CWA | Unfavorable Regulatory Action | EPA | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingencies individual circumstances period | 2021 |  |  |  |  |
Maximum | CWA | Unfavorable Regulatory Action | EPA | Final Rule to Revise Effluent Limitations Guidelines for Steam Electric Power Generating Category |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingencies individual circumstances period | 2028 |  |  |  |  |
Virginia Electric and Power Company | Environmental Protection Agency And State Regulatory Agencies |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of facilities to assess the applicability of section 316(b) | Facility |  |  |  |  | 3 |
Virginia Electric and Power Company | CWA | Unfavorable Regulatory Action |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of facilities that are subject to final regulations | Facility |  |  |  |  | 9 |
Virginia Electric and Power Company | Waste Management and Remediation | Unfavorable Regulatory Action | EPA |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of sites with remediation plans |  |  |  |  | 1 |
Number of additional sites which are not under investigation |  |  |  |  | 2 |
Virginia Electric and Power Company | 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 | $ |  |  |  |  | $ 25 | $ 25
Hydroelectric Facilities | Environmental Protection Agency And State Regulatory Agencies |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of facilities to assess the applicability of section 316(b) | Facility |  |  |  |  | 8 |

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