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Fair Value of FInancial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Electricity physical forward purchase $ 37.53 $ 35.00
Natural gas financial swaps 2.25 2.71
Fnancial swaps - electricity 65.3 54.17
Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Electricity physical forward purchase 153.33 270.00
Natural gas financial swaps 8.89 24.71
Fnancial swaps - electricity 107.31 143.70
Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Electricity physical forward purchase 84.58 101.27
Natural gas financial swaps 3.37 4.42
Fnancial swaps - electricity 91.33 104.21
Assets [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Electricity physical forward purchase 14,000,000 52,000,000
Natural gas financial swaps 0 6,000,000
Fnancial swaps - electricity 0 11,000,000
Total commodity contracts 14,000,000 69,000,000
Liabilities [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Electricity physical forward purchase 43,000,000 93,000,000
Natural gas financial swaps 16,000,000 8,000,000
Fnancial swaps - electricity 0 0
Total commodity contracts $ 59,000,000 $ 101,000,000