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Commitments and Contingencies (Narrative) (Detail)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
site
Jul. 31, 2019
USD ($)
May 31, 2019
USD ($)
T
Mar. 31, 2019
USD ($)
MMcf
Jan. 31, 2019
USD ($)
Aug. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2017
Petition
Aug. 31, 2017
USD ($)
Apr. 30, 2017
Petition
station
Aug. 31, 2016
T
Apr. 30, 2015
Facility
Sep. 30, 2019
USD ($)
site
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
MMcf
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Facility
Indicator
site
gal
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]                                          
Environmental Remediation Expense                                     $ (113.0)    
Impairment of assets and other charges                           $ 85.0     $ 12.0   1,232.0 $ 147.0  
Property, plant and equipment, net   $ 67,978.0                       67,978.0         67,978.0   $ 54,560.0 [1]
ARO incurred [2]                                     2,404.0    
Nuclear Obligations                                          
Loss Contingencies [Line Items]                                          
Maximum liability protection per nuclear incident amount                             $ 13,900.0 $ 14,100.0          
SOUTH CAROLINA                                          
Loss Contingencies [Line Items]                                          
Amount claimed by plaintiffs in legal matter                   $ 100.0                      
Percentage claimed by plaintiffs in legal matter                   100.00%                      
SCANA | Subsequent Event                                          
Loss Contingencies [Line Items]                                          
Litigation settlement, amount received from SCANA $ 192.5                                        
SCANA | DESC Ratepayer Case                                          
Loss Contingencies [Line Items]                                          
Escrow account                                         2,000.0
Credit in future electric rate relief                                         2,000.0
Cash payment     $ 117.0                                   115.0
Property, plant and equipment, net     $ 54.0                                    
SCANA | Other Current Liabilities                                          
Loss Contingencies [Line Items]                                          
Reserves   386.0                       386.0         386.0    
SCANA | Other Receivables                                          
Loss Contingencies [Line Items]                                          
Insurance receivables   $ 173.0                       $ 173.0         $ 173.0    
DESC                                          
Loss Contingencies [Line Items]                                          
Equity method investment, ownership percentage   55.00%                       55.00%         55.00%    
Contesting amount for filed liens in Fairfield country             $ 285.0                            
DESC | SCDOR [Member]                                          
Loss Contingencies [Line Items]                                          
Proposed assessment amount from audit               $ 410.0                          
Proportional share with NND project               100.00%                          
Impairment of Assets and Other Charges | SCANA                                          
Loss Contingencies [Line Items]                                          
Impairment of assets and other charges                           $ 38.0         $ 316.0    
Asset impairment charges after tax                           28.0         236.0    
Minimum | SCANA | DESC Ratepayer Case                                          
Loss Contingencies [Line Items]                                          
Proceeds from sale of property                                         60.0
Maximum [Member] | SCANA | Common Stock | Subsequent Event                                          
Loss Contingencies [Line Items]                                          
Litigation settlement amount through stock issuance $ 32.5                                        
Maximum [Member] | SCANA | DESC Ratepayer Case                                          
Loss Contingencies [Line Items]                                          
Proceeds from sale of property                                         85.0
Virginia Electric and Power Company                                          
Loss Contingencies [Line Items]                                          
Environmental Remediation Expense                                     (113.0)    
Impairment of assets and other charges                           38.0         781.0    
Property, plant and equipment, net   $ 32,402.0                       32,402.0         32,402.0   30,521.0 [3]
ARO incurred [2]                                     2,403.0    
Virginia Electric and Power Company | Cost of Landfills and Beneficial Reuse                                          
Loss Contingencies [Line Items]                                          
ARO incurred                               2,400.0   $ 131.0      
Virginia Electric and Power Company | Increase In Property Plant And Equipment                                          
Loss Contingencies [Line Items]                                          
ARO incurred                               1,300.0   46.0      
Virginia Electric and Power Company | Increase In Regulatory Assets                                          
Loss Contingencies [Line Items]                                          
ARO incurred                                   4.0      
Virginia Electric and Power Company | Future Ash Pond and Landfill Closure Costs                                          
Loss Contingencies [Line Items]                                          
ARO incurred                               202.0          
Virginia Electric and Power Company | Other operations and maintenance                                          
Loss Contingencies [Line Items]                                          
ARO incurred                               113.0   81.0      
ARO incurred, after tax                               $ 84.0   60.0      
Virginia Electric and Power Company | Impairment of Assets and Other Charges                                          
Loss Contingencies [Line Items]                                          
Impairment of assets and other charges   17.0   $ 62.0 $ 369.0 $ 160.0                              
Asset impairment charges after tax   12.0   $ 46.0 $ 275.0 $ 119.0                              
Virginia Electric and Power Company | Minimum                                          
Loss Contingencies [Line Items]                                          
Legislation requires for coal combustion residual | MMcf         6.8                     6.8          
Virginia Electric and Power Company | Maximum [Member]                                          
Loss Contingencies [Line Items]                                          
Proposed revenue requirement         $ 225.0                                
Dominion Energy Gas Holdings, LLC                                          
Loss Contingencies [Line Items]                                          
Impairment of assets and other charges                                 $ 1.0   13.0 $ 127.0  
Property, plant and equipment, net   $ 8,666.0                       $ 8,666.0         $ 8,666.0   $ 8,267.0 [4]
CCR | EPA                                          
Loss Contingencies [Line Items]                                          
Number of petition agreed for reconsideration | Petition                 2                        
Unfavorable Regulatory Action | EPA                                          
Loss Contingencies [Line Items]                                          
Electric generating station facilities heightened entrainment analysis per day | gal                                     125,000,000    
Unfavorable Regulatory Action | VDEQ                                          
Loss Contingencies [Line Items]                                          
Significant emission rate initial carbon cap | T       28,000,000.0                                  
Significant emission rate carbon cap reduction percentage per year       3.00%                                  
Significant emission rate ultimate carbon cap | T       19,600,000                                  
Unfavorable Regulatory Action | CWA                                          
Loss Contingencies [Line Items]                                          
Number of facilities that may be subject to final regulations | Facility                                     13    
Unfavorable Regulatory Action | CWA | Virginia Electric and Power Company                                          
Loss Contingencies [Line Items]                                          
Number of mandatory facility-specific factors | Indicator                                     5    
Number of optional facility-specific factors | Indicator                                     6    
Number of facilities that may be subject to final regulations | Facility                                     7    
Unfavorable Regulatory Action | CWA | Virginia Electric and Power Company | Minimum                                          
Loss Contingencies [Line Items]                                          
Electric generating stations with water withdrawals per day | gal                                     2,000,000    
Unfavorable Regulatory Action | CWA | EPA                                          
Loss Contingencies [Line Items]                                          
Significant emission rate per rear CO2 equivalent | T                       75,000                  
Unfavorable Regulatory Action | CWA | 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                    
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA                                          
Loss Contingencies [Line Items]                                          
Number of former manufactured gas plant sites | site   22                       22         22    
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Former Gas Plant Site with Post Closure Groundwater Monitoring Program                                          
Loss Contingencies [Line Items]                                          
Number of former sites | site                                     1    
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company                                          
Loss Contingencies [Line Items]                                          
Number of former manufactured gas plant sites | site   3                       3         3    
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company | Former Gas Plant Site with Post Closure Groundwater Monitoring Program                                          
Loss Contingencies [Line Items]                                          
Estimated compliance costs               $ 18.0                   $ 18.0      
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Virginia Electric and Power Company | Former Gas Plant Site with Post Closure Groundwater Monitoring Program | Other operations and maintenance                                          
Loss Contingencies [Line Items]                                          
Environmental Remediation Expense               16.0                          
Environmental Remediation Expense, net of tax               $ 12.0                          
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | Dominion Energy Gas Holdings, LLC                                          
Loss Contingencies [Line Items]                                          
Number of former manufactured gas plant sites | site   12                       12         12    
Unfavorable Regulatory Action | Coal Tar and Other Potentially Harmful Materials | EPA | SCANA                                          
Loss Contingencies [Line Items]                                          
Estimated compliance costs   $ 10.0                       $ 10.0         $ 10.0    
Number of sites under investigation, remediation and monitoring | site                                     4    
Number of sites with an updated remediation work plan | site                                     1    
Updated remediation work plan, cost increase                                     $ 8.0    
Unfavorable Regulatory Action | CCR | EPA | Environmental Protection Agency Final Rule Regulating Management of CCRs | Facilities Subject to Coal Combustion Residual Final Rule                                          
Loss Contingencies [Line Items]                                          
Number of facilities with CCR | Facility                         11                
Unfavorable Regulatory Action | CCR | EPA | Virginia Electric and Power Company | Environmental Protection Agency Final Rule Regulating Management of CCRs | Facilities Subject to Coal Combustion Residual Final Rule                                          
Loss Contingencies [Line Items]                                          
Number of facilities with CCR | Facility                         8                
Number of stations | station                     4                    
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Primarily related to future ash pond and landfill closure costs at certain utility generation facilities. See Note 18 for further information.
[3] Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.
[4] Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.