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Variable Interest Entities (Narrative) (Details)
1 Months Ended 12 Months Ended
Sep. 30, 2020
Jul. 31, 2020
USD ($)
MW
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Variable Interest Entity [Line Items]          
Investments     $ 70,000,000 $ 71,000,000 $ 69,000,000
Variable Interest Entity, Primary Beneficiary | Aviator Wind          
Variable Interest Entity [Line Items]          
Ownership interest 51.00% 51.00%      
Nameplate capacity (in MW) | MW   525      
Capacity committed (in MW) | MW   420      
Gain (loss) on initial consolidation   $ 0      
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     $ 70,000,000 $ 71,000,000  
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%