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Variable Interest Entities (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2020
Jul. 31, 2020
MW
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]        
Investments     $ 72 $ 70
Variable Interest Entity, Primary Beneficiary | Aviator Wind        
Variable Interest Entity [Line Items]        
Ownership interest 51.00% 51.00%    
Nameplate capacity (in MW) | MW   525    
Variable Interest Entity, Primary Beneficiary | Aviator Wind Class B Membership        
Variable Interest Entity [Line Items]        
Noncontrolling ownership interest   49.00%    
Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Investments     $ 72 $ 70
Variable Interest Entity, Not Primary Beneficiary | T.E.S. Filer City        
Variable Interest Entity [Line Items]        
Ownership interest     50.00%  
Variable Interest Entity, Not Primary Beneficiary | Grayling        
Variable Interest Entity [Line Items]        
Ownership interest     50.00%  
Variable Interest Entity, Not Primary Beneficiary | Genesee        
Variable Interest Entity [Line Items]        
Ownership interest     50.00%  
Variable Interest Entity, Not Primary Beneficiary | Craven        
Variable Interest Entity [Line Items]        
Ownership interest     50.00%