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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Low [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | $ 13.63 | $ 14.60
Natural gas financial swaps | 1.03 | 0.95
Financial swaps - electricity | 24.79 |
High [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 78.80 | 69.00
Natural gas financial swaps | 3.67 | 4.64
Financial swaps - electricity | 60.25 |
Weighted Average [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 51.43 | 45.00
Natural gas financial swaps | 1.67 | 1.82
Financial swaps - electricity | 37.17 |
Assets [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 1,000,000 | 3,000,000
Natural gas financial swaps | 1,000,000 | 0
Financial swaps - electricity | 0 |
Total commodity contracts | 2,000,000 | 3,000,000
Liabilities [Member] |  |
Commodity Contracts |  |
Electricity physical forwards | 68,000,000 | 84,000,000
Natural gas financial swaps | 5,000,000 | 7,000,000
Financial swaps - electricity | 1,000,000 |
Total commodity contracts | $ 74,000,000 | $ 91,000,000

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