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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 27, 2018
Jan. 29, 2016
Jun. 01, 2001
Dec. 31, 2018
Apr. 01, 2019
Dec. 31, 2016
Loss Contingencies [Line Items]            
Nuclear insurance liability limit per incident       $ 14,070,000    
Required nuclear liability insurance       450,000    
Nuclear financial protection pool mandated by the Price-Anderson Act       13,400,000    
Maximum assessment mandated by Price-Anderson Act per nuclear reactor for a nuclear incident       $ 138,000    
Maximum assessment, administrative fee (as percent)       5.00%    
Maximum annual assessment payment mandated by Price-Anderson Act for a nuclear incident       $ 21,000    
44% maximum assessment       44.00%    
Nuclear operator maximum annual assessment       $ 9,000    
Maximum liability per nuclear incident       61,000    
Mutual property insurance additional blanket policy property coverage       1,250,000    
Nuclear property insurance coverage limit per individual insured       1,500,000    
Lost revenue insurance maximum weekly recovery       3,000    
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss       $ 1,980    
Multiplier that the industry mutual insurance company may assess against insureds premium       10    
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    
Midwest Generation Asbestos Liabilities            
Loss Contingencies [Line Items]            
Damages sought $ 61,000          
CDWR and SDGE v Sunrise Power            
Loss Contingencies [Line Items]            
Power Purchase Agreement (PPA) period     10 years      
Damages sought   $ 1,200        
Remaining term   70 months        
Nuclear Event            
Loss Contingencies [Line Items]            
Total nuclear property insurance coverage       $ 2,750,000    
Lost revenue insurance maximum weekly recovery       274,000    
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss       216,000    
Non-nuclear Event            
Loss Contingencies [Line Items]            
Total nuclear property insurance coverage       1,500,000    
Lost revenue insurance maximum weekly recovery       184,000    
Accidental outage weekly recovery limit for loss revenues from a nuclear industry mutual insurance company in the event of insurable loss       $ 144,000    
Non-nuclear Event | Scenario, Forecast            
Loss Contingencies [Line Items]            
Total nuclear property insurance coverage         $ 1,000,000  
Lignite Contract with Texas Westmoreland Coal Co.            
Loss Contingencies [Line Items]            
Bond obligation           $ 99,000