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Fair Value of FInancial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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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

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