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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Low [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | $ 17.00 | $ 37.53
Natural gas financial swaps | 2.28 | 2.25
Financial swaps - electricity | 40.00 | 65.30
High [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 156.50 | 153.33
Natural gas financial swaps | 9.59 | 8.89
Financial swaps - electricity | 156.50 | 107.31
Weighted Average [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 78.73 | 84.58
Natural gas financial swaps | 3.40 | 3.37
Financial swaps - electricity | 92.51 | 91.33
Assets [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 5,000,000 | 14,000,000
Natural gas financial swaps | 0 | 0
Financial swaps - electricity | 1,000,000 | 0
Total commodity contracts | 6,000,000 | 14,000,000
Liabilities [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 32,000,000 | 43,000,000
Natural gas financial swaps | 16,000,000 | 16,000,000
Financial swaps - electricity | 1,000,000 | 0
Total commodity contracts | $ 49,000,000 | $ 59,000,000

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