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Commitments and Contingencies - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
case
nuclearReactor
assessment
Oct. 31, 2021
facility
Jun. 30, 2019
facility
Loss Contingencies [Line Items]      
Nuclear insurance liability limit per incident $ 13,700    
Required nuclear liability insurance 450    
Nuclear financial protection pool mandated by the Price-Anderson Act 13,200    
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    
Number of nuclear reactors with shared single limit blanket coverage | nuclearReactor 2    
Nuclear property insurance coverage limit per individual insured $ 1,500    
Lost revenue insurance maximum weekly recovery $ 3    
Insurance coverage, waiting period 56 days    
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    
Number of facilities | facility   2  
Sierra Club Et Al V. Midwest Generation L L C      
Loss Contingencies [Line Items]      
Number of facilities | facility     4
Direct Energy vs. Stanley, Forte, Schafer and Lane      
Loss Contingencies [Line Items]      
Number of class action lawsuits | case 4    
Direct Energy vs. Burk and Dickson 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 183    
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss $ 144