Environmental remediation reserves.

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- Definition

Loss contingencies facility retirement period.

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- Definition

Loss contingencies individual circumstances period.

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No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Loss contingency number of separate petitions for reconsideration granted.

+ References

No definition available.

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- Definition

Number of additional sites which are not under investigation.

+ References

No definition available.

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- Definition

Number of mandatory facility-specific factors

+ References

No definition available.

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- Definition

Number of optional facility-specific factors.

+ References

No definition available.

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- Definition

Number of sites remediation work substantially completed.

+ References

No definition available.

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- Definition

Number of sites with remediation plans.

+ References

No definition available.

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- Definition

Offsetting reserve and insurance receivable.

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No definition available.

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- Definition

Public utilities electric generating station facilities heightened entrainment analysis.

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Public utilities electric generating station facilities water withdrawals.

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- Definition

Public utilities significant emission rate per year CO2 equivalent.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Commitments and Contingencies (Narrative) (Detail) $ in Millions	1 Months Ended				6 Months Ended	12 Months Ended
	May 31, 2024	Oct. 31, 2020	Apr. 30, 2017 Petition	Aug. 31, 2016 T	Jun. 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 \| $					$ 55	$ 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 \| $					$ 50	50
Other Legal Matters \| East Ohio
Loss Contingencies [Line Items]
Offsetting reserve and insurance receivable \| $						$ 30