Environmental remediation reserves.

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Environmental remediation reserves after tax.

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Environmental remediation reserves charge.

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Loss contingencies facility retirement period.

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Loss contingencies individual circumstances period.

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Loss contingency number of facilities that may be subject to final regulations.

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Loss contingency number of facilities to assess the applicability of section.

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Loss contingency number of separate petitions for reconsideration granted.

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Number of additional sites which are not under investigation.

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Number of mandatory facility-specific factors

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Number of optional facility-specific factors.

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Number of sites remediation work substantially completed.

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Number of sites with remediation plans.

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Offsetting reserve and insurance receivable.

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Public utilities electric generating station facilities governed under rule water withdrawals levels.

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Public utilities electric generating station facilities heightened entrainment analysis.

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Public utilities significant emission rate per year CO2 equivalent.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Commitments and Contingencies (Environmental Matters) (Narrative) (Detail) $ in Millions	1 Months Ended				12 Months Ended
	May 31, 2024	Oct. 31, 2020	Apr. 30, 2017 Petition	Aug. 31, 2016 T	Dec. 31, 2024 USD ($) Facility Site Indicator gal	Dec. 31, 2023 USD ($) gal
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					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
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					$ 56	$ 32
Environmental remediation reserves charge					25
Environmental remediation reserves after tax					$ 19
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	2029	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					8
Virginia Electric and Power Company \| Waste Management and Remediation \| Unfavorable Regulatory Action \| EPA
Loss Contingencies [Line Items]
Number of sites with remediation plans \| Site					1
Number of additional sites which are not under investigation \| Site					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					$ 50	$ 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
East Ohio \| Other Legal Matters
Loss Contingencies [Line Items]
Offsetting reserve and insurance receivable					$ 30