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Fair Value of FInancial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Electricity physical forward purchase $ 14.00 $ 37.53
Natural gas financial swaps 1.86 2.25
Fnancial swaps - electricity 27.00 65.30
Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Electricity physical forward purchase 99.68 153.33
Natural gas financial swaps 6.53 8.89
Fnancial swaps - electricity 110.00 107.31
Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Electricity physical forward purchase 59.43 84.58
Natural gas financial swaps 2.68 3.37
Fnancial swaps - electricity 70.55 91.33
Assets [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Electricity physical forward purchase 0 14,000,000
Natural gas financial swaps 0 0
Fnancial swaps - electricity 1,000,000 0
Total commodity contracts 1,000,000 14,000,000
Liabilities [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Electricity physical forward purchase 28,000,000 43,000,000
Natural gas financial swaps 4,000,000 16,000,000
Fnancial swaps - electricity 3,000,000 0
Total commodity contracts $ 35,000,000 $ 59,000,000