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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Low [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | $ 33.00 | $ 35.00
Natural gas financial swaps | 2.37 | 2.71
Financial swaps - electricity | 52.00 | 54.17
High [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 149.00 | 270.00
Natural gas financial swaps | 11.43 | 24.71
Financial swaps - electricity | 120.00 | 143.70
Weighted Average [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 83.49 | 101.27
Natural gas financial swaps | 3.60 | 4.42
Financial swaps - electricity | 91.88 | 104.21
Assets [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 12,000,000 | 52,000,000
Natural gas financial swaps | 3,000,000 | 6,000,000
Financial swaps - electricity | 1,000,000 | 11,000,000
Total commodity contracts | 16,000,000 | 69,000,000
Liabilities [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 111,000,000 | 93,000,000
Natural gas financial swaps | 21,000,000 | 8,000,000
Financial swaps - electricity | 1,000,000 | 0
Total commodity contracts | $ 133,000,000 | $ 101,000,000

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