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Fair Value of FInancial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
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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

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