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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Low [Member]    
Commodity Contracts    
Electricity physical forwards $ 15.00 $ 11.17
Natural gas financial swaps 2.21 1.52
Financial swaps - electricity 26.50 8.78
High [Member]    
Commodity Contracts    
Electricity physical forwards 127.00 51.18
Natural gas financial swaps 8.12 4.33
Financial swaps - electricity 71.00 58.42
Weighted Average [Member]    
Commodity Contracts    
Electricity physical forwards 47.86 29.74
Natural gas financial swaps 3.23 2.29
Financial swaps - electricity 56.45 43.71
Assets [Member]    
Commodity Contracts    
Electricity physical forwards 4,000,000 0
Natural gas financial swaps 24,000,000 1,000,000
Financial swaps - electricity 8,000,000 4,000,000
Total commodity contracts 36,000,000 5,000,000
Liabilities [Member]    
Commodity Contracts    
Electricity physical forwards 90,000,000 141,000,000
Natural gas financial swaps 0 1,000,000
Financial swaps - electricity 0 0
Total commodity contracts $ 90,000,000 $ 142,000,000