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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Low [Member] |  |
Commodity Contracts |  |
Electricity physical forward | $ 4.50 | $ 9.63
Natural gas financial swaps | 3.32 | 3.16
Electricity financial futures | 9.50 | 9.63
High [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 81.20 | 77.95
Natural gas financial swaps | 5.38 | 4.49
Electricity financial futures | 46.62 | 46.07
Weighted Average [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 36.81 | 40.18
Natural gas financial swaps | 3.87 | 3.71
Electricity financial futures | 33.07 | 33.01
Assets [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 0 | 0
Natural gas financial swaps | 1,000,000 | 0
Electricity financial futures | 0 | 1,000,000
Total commodity contracts | 1,000,000 | 1,000,000
Liabilities [Member] |  |
Commodity Contracts |  |
Electricity physical forward | 102,000,000 | 103,000,000
Natural gas financial swaps | 17,000,000 | 23,000,000
Electricity financial futures | 13,000,000 | 14,000,000
Total commodity contracts | $ 132,000,000 | $ 140,000,000

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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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