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Commitments and Contingencies (Nuclear Operations) (Narrative) (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 31, 2024
Jan. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Loss Contingencies [Line Items]          
Minimum financial assurance     $ 3,400,000,000    
NRC minimum requirement for nuclear power plant licensees     1,060,000,000.00    
Maximum assessment for premiums on insurance policy     36,000,000    
Maximum assessment for insurance policy     56,000,000    
Receivables for spent nuclear fuel     83,000,000 $ 62,000,000  
Maximum          
Loss Contingencies [Line Items]          
Amount that could be assessed for each licensed reactor     166,000,000    
Amount that could be assessed for each licensed reactor per reactor     25,000,000    
Nuclear Obligations          
Loss Contingencies [Line Items]          
Maximum liability protection per nuclear incident amount     16,300,000,000    
Nuclear Obligations | Secondary Financial Protection Program          
Loss Contingencies [Line Items]          
Maximum liability protection per nuclear incident amount $ 16,300,000,000 $ 16,200,000,000      
Virginia Electric and Power Company          
Loss Contingencies [Line Items]          
Minimum financial assurance     2,000,000,000.0    
Maximum assessment for premiums on insurance policy     10,000,000    
Maximum assessment for insurance policy     30,000,000    
Receivables for spent nuclear fuel     62,000,000 43,000,000  
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     16,000,000 22,000,000 $ 17,000,000
Millstone          
Loss Contingencies [Line Items]          
Settlement amount awarded from other party     11,000,000 8,000,000 7,000,000
Summer          
Loss Contingencies [Line Items]          
Settlement amount awarded from other party     2,000,000 $ 6,000,000 $ 1,000,000
Millstone, Summer, Surry and North Anna          
Loss Contingencies [Line Items]          
Amount of coverage purchased from commercial insurance pools     500,000,000    
Property insurance coverage     $ 1,060,000,000.00