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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
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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 |

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