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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Aug. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Segment Reporting Information [Line Items]            
Gain (loss) on investments     $ 639.0 $ 412.0 $ 626.0  
Asset early retirement expense     165.0 114.0    
Virginia Electric and Power Company            
Segment Reporting Information [Line Items]            
Asset early retirement expense     131.0 85.0    
SCANA            
Segment Reporting Information [Line Items]            
Litigation settlement expense $ 32.5 $ 192.5        
Merger and integration-related costs         427.0  
Merger and integration-related costs, after tax         320.0  
Charge related to a voluntary retirement program         394.0  
Charge related to a voluntary retirement program, after-tax         295.0  
Operating Segments            
Segment Reporting Information [Line Items]            
After-tax net expense (income)     493.0 1,200.0 1,900.0  
Operating Segments | Virginia Electric and Power Company            
Segment Reporting Information [Line Items]            
After-tax net expense (income)     202.0 863.0    
Benefit for change in expected CCRO reserve     130.0      
Benefit for change in expected CCRO reserve, after tax     97.0      
Charges associated with budget process related to customer arrears     77.0      
Charges associated with budget process related to customer arrears, after tax     57.0      
Charge associated with storm damage and service restoration     68.0      
Charge associated with storm damage and service restoration, after tax     50.0      
Amortization of regulatory asset     61.0      
Amortization of regulatory asset after tax     45.0      
Loss from unbilled revenue reduction     151.0      
Loss from unbilled revenue reduction, after tax     112.0      
Net charge associated with settlement of the 2021 Triennial Review     125.0      
Net charge associated with settlement of the 2021 Triennial Review, after tax     93.0      
Asset early retirement expense after tax       559.0 257.0  
Charge for expected CCRO       130.0    
Charge for expected CCRO, net of tax       97.0    
Charges associated with legislation enacted related to customer arrears       127.0    
Charges associated with legislation enacted related to customer arrears, net of tax       94.0    
Charge related to a voluntary retirement program         198.0  
Charge related to a voluntary retirement program, after-tax         146.0  
Benefit from revision of future closure costs         113.0  
Benefit from revision of future closure costs, after tax         84.0  
Operating Segments | Nuclear Decommissioning Trust Funds            
Segment Reporting Information [Line Items]            
Gain (loss) on investments     568.0 335.0 553.0  
Gain (loss) on investments, after tax     445.0 264.0 411.0  
Corporate and Other | Operating Segments            
Segment Reporting Information [Line Items]            
After-tax net expense (income)     99.0 3,700.0 1,800.0  
After- tax net expense (income) for specific items     (97.0) 3,400.0 1,500.0  
Corporate and Other | Operating Segments | Virginia Electric and Power Company            
Segment Reporting Information [Line Items]            
After-tax net expense (income)     202.0 863.0 634.0  
After- tax net expense (income) for specific items     202.0 915.0 627.0  
Contracted Assets | SCANA            
Segment Reporting Information [Line Items]            
Charge related to a voluntary retirement program, after-tax         38.0  
Contracted Assets | Operating Segments            
Segment Reporting Information [Line Items]            
Loss related to economic hedging activities     347.0      
Loss related to economic hedging activities, after tax     261.0      
Net loss on the sale of non-wholly-owned nonregulated solar facilities     211.0      
Net loss on the sale of non-wholly-owned nonregulated solar facilities after tax     161.0      
Charge associated with revision in estimated recovery of spent nuclear fuel costs associated with the decommissioning of Kewaunee     44.0      
Charge associated with revision in estimated recovery of spent nuclear fuel costs associated with the decommissioning of Kewaunee, after tax     35.0      
Charge associated with certain nonregulated solar generation facilities       405.0    
Charge associated with certain nonregulated solar generation facilities, net of tax       325.0    
Charge associated with the sale of Fowler Ridge       221.0    
Charge associated with the sale of Fowler Ridge, net of tax       171.0    
Contracted Assets | Operating Segments | Nuclear Decommissioning Trust Funds            
Segment Reporting Information [Line Items]            
Gain (loss) on investments, after tax     390.0 237.0 362.0  
Dominion Energy Virginia | Virginia Legislation            
Segment Reporting Information [Line Items]            
Benefit from revision of future closure costs         113.0  
Benefit from revision of future closure costs, after tax         84.0  
Dominion Energy Virginia | SCANA            
Segment Reporting Information [Line Items]            
Charge related to a voluntary retirement program, after-tax         151.0  
Dominion Energy Virginia | Automated Meter Reading Program            
Segment Reporting Information [Line Items]            
Asset early retirement expense         160.0  
Asset early retirement expense after tax         119.0  
Dominion Energy Virginia | Operating Segments            
Segment Reporting Information [Line Items]            
Benefit for change in expected CCRO reserve     130.0      
Benefit for change in expected CCRO reserve, after tax     97.0      
Charges associated with budget process related to customer arrears     77.0      
Charges associated with budget process related to customer arrears, after tax     57.0      
Charge associated with storm damage and service restoration     68.0      
Charge associated with storm damage and service restoration, after tax     50.0      
Amortization of regulatory asset     61.0      
Amortization of regulatory asset after tax     45.0      
Loss from unbilled revenue reduction     151.0      
Loss from unbilled revenue reduction, after tax     112.0      
Net charge associated with settlement of the 2021 Triennial Review     125.0      
Net charge associated with settlement of the 2021 Triennial Review, after tax     93.0      
Charge for expected CCRO       130.0    
Charge for expected CCRO, net of tax       97.0    
Charges associated with legislation enacted related to customer arrears       127.0    
Charges associated with legislation enacted related to customer arrears, net of tax       94.0    
Dominion Energy Virginia | Operating Segments | Virginia Electric and Power Company            
Segment Reporting Information [Line Items]            
Payment for contract termination         135.0  
Payment for contract termination after tax         100.0  
Dominion Energy Virginia | Operating Segments | Electric Generation Facilities            
Segment Reporting Information [Line Items]            
Asset early retirement expense       751.0 346.0  
Asset early retirement expense after tax       564.0 257.0  
Dominion Energy Virginia | Operating Segments | Nuclear Decommissioning Trust Funds            
Segment Reporting Information [Line Items]            
Gain (loss) on investments, after tax     55.0 27.0 49.0  
Dominion Energy South Carolina Inc | SCANA            
Segment Reporting Information [Line Items]            
Charge for refund of amounts from customers, current           $ 137.0
Charge for refund of amounts from customers, after tax         756.0  
Dominion Energy South Carolina Inc | SCANA | NND Project            
Segment Reporting Information [Line Items]            
Tax benefit resulting from re-measurement of deferred income taxes as a result of the 2017 Tax Reform Act         194.0  
Income tax regulatory assets   258.0     258.0  
Dominion Energy South Carolina Inc | Operating Segments            
Segment Reporting Information [Line Items]            
Litigation settlement expense     70.0 117.0 641.0  
Litigation settlement expense, after tax     53.0 $ 93.0 480.0  
Charges associated with the settlement of the South Carolina electric base rate case     266.0      
Charges associated with the settlement of the South Carolina electric base rate case, after tax     $ 199.0      
Charge for refund of amounts from customers, current   $ 1,000.0     1,000.0  
Charge for refund of amounts from customers, after tax         756.0  
Charge related to a voluntary retirement program, after-tax         75.0  
Charge for property, plant and equipment acquired but committed to forgo recovery         114.0  
Charge for property, plant and equipment acquired but committed to forgo recovery, after tax         86.0  
Gas Distribution | SCANA            
Segment Reporting Information [Line Items]            
Charge related to a voluntary retirement program, after-tax         $ 56.0