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Commitments and Contingencies (Narrative) (Detail) shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 05, 2022 shares | Aug. 31, 2021 shares | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Oct. 31, 2020 | Jun. 30, 2018 USD ($) | Aug. 31, 2017 USD ($) | Apr. 30, 2017 Petition | Aug. 31, 2016 T | Mar. 31, 2022 USD ($) site | Mar. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) Indicator Facility gal | Dec. 31, 2021 USD ($)
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  | $ 0 | $ 60 |  |
Impairment of assets and other charges, after tax |  |  |  |  |  |  |  |  |  |  | $ 45 |  |
SCANA | State Court Derivative Case |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement paid |  |  | $ 33 |  |  |  |  |  |  |  |  |  |
SCANA | Federal Court Merger Case | State Court Merger Case |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement paid |  |  | 63 |  |  |  |  |  |  |  |  |  |
SCANA | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for SCANA legal proceedings |  |  |  |  |  |  |  |  |  | 257 |  | $ 257 | $ 274
SCANA | Other Receivables |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance receivables |  |  |  |  |  |  |  |  |  | 118 |  | $ 118 | 118
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 |  |  |  | $ 165 |  |  |  |  |  |  |  |  |
Proposed assessment amount from audit |  |  |  |  |  | $ 410 |  |  |  |  |  |  |
Proportional share of NND project |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount claimed by plaintiffs in legal matter |  |  |  |  |  |  | $ 100 |  |  |  |  |  |
Percentage claimed by plaintiffs in legal matter |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Dominion Energy South Carolina Inc | DESC | SCDOR | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Initial litigation settlement through stock issuance | shares |  | 0.6 |  |  |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | DESC | SCDOR | Subsequent Event | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Initial litigation settlement through stock issuance | shares | 0.9 |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | Minimum [Member] | 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 |  |  |  |  |  |  |  |  |  | 70 |  | $ 70 | 85
Insurance receivables |  |  |  |  |  |  |  |  |  | $ 70 |  | $ 70 | 85
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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] | 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 |  |  |  |  |  |  |  |  |  | 2 |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 52 |  |  | 45
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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