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Commitments and Contingencies (Nuclear Operations) (Narrative) (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Nov. 30, 2013
$ / MWh
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Loss Contingencies [Line Items]        
Amount of coverage purchased from commercial insurance pools   $ 375    
Maximum assessment for premiums on insurance policy   87    
Maximum assessment for insurance policy   23    
Current fee per MWh for electricity paid by civilian nuclear power generators | $ / MWh 1      
Waste fee recognized       $ 16
Maximum        
Loss Contingencies [Line Items]        
Amount that could be assessed for each licensed reactor   127    
Amount that could be assessed for each licensed reactor per reactor   19    
Spent Nuclear Fuel        
Loss Contingencies [Line Items]        
Receivables   56 $ 87  
Millstone Unit 1        
Loss Contingencies [Line Items]        
Minimum financial assurance     2,900  
Surry and North Anna        
Loss Contingencies [Line Items]        
Settlement amount   30 8 27
Millstone        
Loss Contingencies [Line Items]        
Settlement amount   22 17 17
Kewaunee        
Loss Contingencies [Line Items]        
Settlement amount     7  
Virginia Electric and Power Company        
Loss Contingencies [Line Items]        
Maximum assessment for premiums on insurance policy   49    
Maximum assessment for insurance policy   10    
Waste fee recognized       $ 10
Virginia Electric and Power Company | Spent Nuclear Fuel        
Loss Contingencies [Line Items]        
Receivables   $ 37 54  
Virginia Electric and Power Company | Kewaunee        
Loss Contingencies [Line Items]        
Minimum financial assurance     $ 1,800