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Commitments and Contingencies - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
assessment
case
Jun. 19, 2019
facility
Loss Contingencies [Line Items]    
Nuclear insurance liability limit per incident $ 13,800  
Required nuclear liability insurance 450  
Nuclear financial protection pool mandated by the Price-Anderson Act 13,300  
Maximum assessment mandated by Price-Anderson Act per nuclear reactor for a nuclear incident $ 138  
Maximum assessment, administrative fee (as percent) 5.00%  
Maximum assessment payment mandated by Price-Anderson Act for a nuclear incident $ 21  
Maximum assessment 44.00%  
Nuclear operator maximum annual assessment $ 9  
Maximum liability per nuclear incident 61  
Mutual property insurance additional blanket policy property coverage 1,300  
Nuclear property insurance coverage limit per individual insured 1,500  
Lost revenue insurance maximum weekly recovery 3  
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss $ 2  
The number of months a nuclear industry mutual insurance company will respond to retrospective premium adjustments 24 months  
Number of years board of directors of industry mutual insurance company can adjust policy after policy expires 6 years  
Sierra Club Et Al V. Midwest Generation L L C    
Loss Contingencies [Line Items]    
Number of facilities | facility   4
XOOM Energy Litigation    
Loss Contingencies [Line Items]    
Number of class action lawsuits | case 2  
High    
Loss Contingencies [Line Items]    
Multiplier that the industry mutual insurance company may assess against insureds premium | assessment 10  
Low    
Loss Contingencies [Line Items]    
Multiplier that the industry mutual insurance company may assess against insureds premium | assessment 6  
Nuclear Event    
Loss Contingencies [Line Items]    
Total nuclear property insurance coverage $ 2,800  
Lost revenue insurance maximum weekly recovery 274  
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss 216  
Non-nuclear Event    
Loss Contingencies [Line Items]    
Total nuclear property insurance coverage 1,000  
Lost revenue insurance maximum weekly recovery 184  
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss $ 144