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Fair Value of FInancial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Minimum [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | $ 12.53 | $ 14.60
Natural gas financial swaps | 1.39 | 0.95
Fnancial swaps - electricity | 10.57 | 20.75
Maximum [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 59.00 | 69.00
Natural gas financial swaps | 3.73 | 4.64
Fnancial swaps - electricity | 66.32 | 35.46
Weighted Average [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 36.92 | 45.00
Natural gas financial swaps | 1.90 | 1.82
Fnancial swaps - electricity | 45.11 | 28.63
Assets [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 0 | 3,000,000
Natural gas financial swaps | 1,000,000 | 0
Fnancial swaps - electricity | 7,000,000 | 0
Total commodity contracts | 8,000,000 | 3,000,000
Liabilities [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Electricity physical forward purchase | 104,000,000 | 84,000,000
Natural gas financial swaps | 0 | 7,000,000
Fnancial swaps - electricity | 1,000,000 | 0
Total commodity contracts | $ 105,000,000 | $ 91,000,000

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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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