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Commitments and Contingencies (Narrative) (Detail)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
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 ($)
Apr. 30, 2017
Petition
Aug. 31, 2016
T
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
Site
Jun. 30, 2023
USD ($)
Site
Facility
Indicator
gal
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Loss Contingencies [Line Items]                                    
Gain on sales of assets                         $ 22   $ (636) $ 23 $ (608)  
Gain on sales of assets after tax                         586   $ (452) 1,588 $ 240  
SCANA | Other Current Liabilities                                    
Loss Contingencies [Line Items]                                    
Reserves for SCANA legal proceedings   $ 66                     66     66   $ 94
SCANA | Other Receivables                                    
Loss Contingencies [Line Items]                                    
Insurance receivables   72                     72     $ 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%                
Fair value of certain non-utility property transferred     $ 28                              
Fair value of utility property transferred                           $ 10        
Gain upon completion of remaining transfer of utility properties   11                     11     $ 11    
Gain on sales of assets   11                       9        
Fair value of additional utility property transferred                                   3
Gain on sales of assets after tax   8                       $ 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                      
Dominion Energy South Carolina Inc | Maximum | SCDOR | Subsequent Event                                    
Loss Contingencies [Line Items]                                    
Cash payment for remaining obligation $ 1                                  
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    
Personal Injury or Wrong Death Cases | SCANA                                    
Loss Contingencies [Line Items]                                    
Reserves for SCANA legal proceedings   62                     62     $ 62   68
Insurance receivables   $ 62                     $ 62     $ 62   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                               $ 46   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