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Commitments and Contingencies (Nuclear Operations) (Narrative) (Detail) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Feb. 28, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Loss Contingencies [Line Items]            
Settlement amount awarded from other party     $ 48,000,000      
Minimum financial assurance       $ 3,600,000,000    
NRC minimum requirement for nuclear power plant licensees       1,060,000,000.00    
Maximum assessment for premiums on insurance policy       32,000,000    
Maximum assessment for insurance policy       65,000,000    
Spent Nuclear Fuel            
Loss Contingencies [Line Items]            
Receivables       56,000,000 $ 52,000,000  
Maximum            
Loss Contingencies [Line Items]            
Amount that could be assessed for each licensed reactor       138,000,000    
Amount that could be assessed for each licensed reactor per reactor       20,000,000    
Nuclear Obligations            
Loss Contingencies [Line Items]            
Maximum liability protection per nuclear incident amount       13,700,000,000    
Nuclear Obligations | Secondary Financial Protection Program            
Loss Contingencies [Line Items]            
Maximum liability protection per nuclear incident amount $ 13,700,000,000 $ 13,500,000,000        
Virginia Electric and Power Company            
Loss Contingencies [Line Items]            
Minimum financial assurance       2,100,000,000    
Maximum assessment for premiums on insurance policy       33,000,000    
Maximum assessment for insurance policy       9,000,000    
Virginia Electric and Power Company | Spent Nuclear Fuel            
Loss Contingencies [Line Items]            
Receivables       37,000,000 39,000,000  
DESC | Non-nuclear Obligation | European Mutual Association            
Loss Contingencies [Line Items]            
Property insurance coverage       1,000,000    
Surry and North Anna            
Loss Contingencies [Line Items]            
Settlement amount awarded from other party       17,000,000 25,000,000 $ 24,000,000
Millstone            
Loss Contingencies [Line Items]            
Settlement amount awarded from other party       7,000,000 9,000,000 11,000,000
Summer            
Loss Contingencies [Line Items]            
Settlement amount awarded from other party       1,000,000 $ 1,000,000 $ 4,000,000
Millstone, Summer, Surry and North Anna            
Loss Contingencies [Line Items]            
Amount of coverage purchased from commercial insurance pools       450,000,000    
Property insurance coverage       $ 1,060,000,000.00