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Commitments and Contingencies (Narrative) (Detail) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
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 ($) | Apr. 30, 2017 Petition | Aug. 31, 2016 T | Mar. 31, 2023 USD ($) Facility Site Indicator gal | Jun. 30, 2022 Site | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sales of assets |  |  |  |  |  |  |  |  |  |  | $ 1 |  | $ 28 |
Gain on sales of assets after tax |  |  |  |  |  |  |  |  |  |  | 1,002 |  | $ 692 |
SCANA | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for SCANA legal proceedings |  |  |  |  |  |  |  |  |  |  | 88 |  |  | $ 94
SCANA | Other Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivables |  |  |  |  |  |  |  |  |  |  | $ 72 |  |  | 68
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 |  |  |  | $ 165 |  |  |  |  |  |  |  |
Proposed assessment amount from audit |  |  |  |  |  |  |  | $ 410 |  |  |  |  |  |
Proportional share of NND project |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Expected gain upon completion of remaining transfer of utility properties |  |  |  |  |  |  |  |  |  |  | $ 10 |  |  |
Fair value of certain non-utility property transferred | $ 28 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of utility property transferred |  |  |  |  |  |  |  |  |  |  | 10 |  |  |
Gain on sales of assets |  |  |  |  |  |  |  |  |  |  | 9 |  |  |
Fair value of additional utility property transferred |  |  |  |  |  |  |  |  |  |  |  |  |  | 3
Gain on sales of assets after tax |  |  |  |  |  |  |  |  |  |  | $ 7 |  |  |
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 | Minimum | SCDOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial litigation settlement amount through stock issuance |  |  |  |  | $ 43 |  |  |  |  |  |  |  |  |
Unfavorable Regulatory Action | EPA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generating station facilities heightened entrainment analysis per day | gal |  |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |
Personal Injury or Wrong Death Cases | SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for SCANA legal proceedings |  |  |  |  |  |  |  |  |  |  | $ 72 |  |  | 68
Insurance receivables |  |  |  |  |  |  |  |  |  |  | $ 72 |  |  | 68
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 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric generating stations with water withdrawals per day | gal |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |
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 |  |  |  |  |  |  |  |  |  |  | 13 |  |  |
Number of sites with remediation plans | Site |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of additional sites which are not under investigation | Site |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  | $ 47 |  |  | 47
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 |  |  | $ 25

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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3536-108585 + Details
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