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Electric utility segment Liquefied Natural Gas (Details)
 1 Months Ended
Aug. 31, 2014
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Electric utility subsidiary [Abstract]  
Term Of Agreement 15 years
Liquefaction capacity annual purchases, first tranche 800,000
Purchase agreement, period of first tranche 5 years
Liquefaction capacity annual purchases, second tranche 700,000
Purchase agreement, period of second tranche 5 years
Liquefaction capacity annual purchases, third tranche 600,000
Purchase agreement, period of third tranche 5 years