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Fair Value of FInancial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Minimum [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | $ 11.17 | $ 12.53
Natural gas financial swaps | 1.52 | 1.39
Fnancial swaps - electricity | 8.78 | 10.57
Maximum [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 51.18 | 59.00
Natural gas financial swaps | 4.33 | 3.73
Fnancial swaps - electricity | 58.42 | 66.32
Weighted Average [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 29.74 | 36.92
Natural gas financial swaps | 2.29 | 1.90
Fnancial swaps - electricity | 43.71 | 45.11
Assets [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 0 | 0
Natural gas financial swaps | 1,000,000 | 1,000,000
Fnancial swaps - electricity | 4,000,000 | 7,000,000
Total commodity contracts | 5,000,000 | 8,000,000
Liabilities [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 141,000,000 | 104,000,000
Natural gas financial swaps | 1,000,000 | 0
Fnancial swaps - electricity | 0 | 1,000,000
Total commodity contracts | $ 142,000,000 | $ 105,000,000

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- Definition Electricity physical forward purchase + References No definition available. + Details
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- Definition Fnancial swaps - electricity + References No definition available. + Details
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- Definition Natural gas financial swaps + References No definition available. + Details
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- Details
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