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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($) | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Low [Member] |  |
Commodity Contracts |  |
Electricity physical forward | $ 11.00 | $ 11.97
Natural gas financial swaps | 2.06 | 2.88
Electricity financial futures | 21.07 | 11.97
High [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 71.77 | 122.72
Natural gas financial swaps | 3.83 | 4.86
Electricity financial futures | 31.00 | 39.26
Weighted Average [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 29.82 | 37.43
Natural gas financial swaps | 2.56 | 3.41
Electricity financial futures | 27.21 | 27.88
Assets [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 0 | 0
Natural gas financial swaps | 0 | 0
Electricity financial futures | 0 | 1,000,000
Total commodity contracts | 0 | 1,000,000
Liabilities [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 117,000,000 | 77,000,000
Natural gas financial swaps | 52,000,000 | 21,000,000
Electricity financial futures | 0 | 3,000,000
Total commodity contracts | $ 169,000,000 | $ 101,000,000

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