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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Low [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | $ 5.75 | $ 11.17
Natural gas financial swaps | 1.60 | 1.52
Financial swaps - electricity | 5.75 | 8.78
High [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 73.58 | 51.18
Natural gas financial swaps | 4.32 | 4.33
Financial swaps - electricity | 73.58 | 58.42
Weighted Average [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 33.39 | 29.74
Natural gas financial swaps | 2.22 | 2.29
Financial swaps - electricity | 37.97 | 43.71
Assets [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 0 | 0
Natural gas financial swaps | 2,000,000 | 1,000,000
Financial swaps - electricity | 5,000,000 | 4,000,000
Total commodity contracts | 7,000,000 | 5,000,000
Liabilities [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 123,000,000 | 141,000,000
Natural gas financial swaps | 1,000,000 | 1,000,000
Financial swaps - electricity | 0 | 0
Total commodity contracts | $ 124,000,000 | $ 142,000,000

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- Definition Fnancial swaps - electricity + References No definition available. + Details
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