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Commitments and Contingencies (Nuclear Operations) (Narrative) (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]            
NRC minimum requirement for nuclear power plant licensees $ 1,060,000,000     $ 1,060,000,000    
Maximum assessment for premiums on insurance policy       83,000,000    
Maximum assessment for insurance policy       21,000,000    
Spent Nuclear Fuel            
Loss Contingencies [Line Items]            
Receivables 49,000,000     49,000,000 $ 46,000,000  
Maximum            
Loss Contingencies [Line Items]            
Amount that could be assessed for each licensed reactor 138,000,000     138,000,000    
Amount that could be assessed for each licensed reactor per reactor 21,000,000     $ 21,000,000    
Nuclear Obligations            
Loss Contingencies [Line Items]            
Maximum liability protection per nuclear incident amount 14,100,000,000 $ 13,100,000,000 $ 13,400,000,000      
Inflationary provision adjustment period       5 years    
Virginia Electric and Power Company            
Loss Contingencies [Line Items]            
Maximum assessment for premiums on insurance policy       $ 51,000,000    
Maximum assessment for insurance policy       10,000,000    
Virginia Electric and Power Company | Spent Nuclear Fuel            
Loss Contingencies [Line Items]            
Receivables 30,000,000     30,000,000 30,000,000  
Dominion Energy and Virginia Electric and Power            
Loss Contingencies [Line Items]            
Amount of coverage purchased from commercial insurance pools 450,000,000     450,000,000    
Surry and North Anna            
Loss Contingencies [Line Items]            
Settlement amount       16,000,000 22,000,000 $ 30,000,000
Millstone            
Loss Contingencies [Line Items]            
Settlement amount       13,000,000 $ 14,000,000 $ 22,000,000
Millstone Unit 1            
Loss Contingencies [Line Items]            
Minimum financial assurance 2,700,000,000     2,700,000,000    
Kewaunee | Nuclear Obligations            
Loss Contingencies [Line Items]            
Maximum liability protection per nuclear incident amount       100,000,000    
Kewaunee | Virginia Electric and Power Company            
Loss Contingencies [Line Items]            
Minimum financial assurance $ 1,800,000,000     $ 1,800,000,000