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Variable Interest Entities (Narrative) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
MW
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]    
Investments $ 73 $ 70
Variable Interest Entity, Primary Beneficiary | Aviator Wind    
Variable Interest Entity [Line Items]    
Ownership interest 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 $ 73 $ 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%