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Investee Companies and Other Investments (Pumped Storage Projects) (Narrative) (Details) - Erez Electricity Ltd [Member] - Pumped Storage Projects [Member]
€ in Thousands, ₪ in Thousands
1 Months Ended 6 Months Ended
Jul. 31, 2014
ILS (₪)
Jul. 31, 2014
EUR (€)
Nov. 30, 2013
ILS (₪)
Installment
Nov. 30, 2013
EUR (€)
Installment
Jul. 17, 2013
ILS (₪)
Jun. 30, 2020
ILS (₪)
Jun. 30, 2020
EUR (€)
Disclosure of subsidiaries [line items]              
Percentage of share capital holds         24.00%    
Additional compensation aggregate amount | €       € 1,678      
Number of installments | Installment     2 2      
First Installment [Member]              
Disclosure of subsidiaries [line items]              
Compensation received | €   € 260          
Second Installment [Member]              
Disclosure of subsidiaries [line items]              
Compensation received | €             € 1,418
NIS [Member]              
Disclosure of subsidiaries [line items]              
Amount of loan         ₪ 770    
Repayment of loan and accrued interest     ₪ 1,000        
Additional compensation aggregate amount     ₪ 6,700        
NIS [Member] | First Installment [Member]              
Disclosure of subsidiaries [line items]              
Compensation received ₪ 1,200            
NIS [Member] | Second Installment [Member]              
Disclosure of subsidiaries [line items]              
Compensation received           ₪ 5,500