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18 Intangible Assets (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible Assets | R$ 6,332,611 | R$ 6,029,097 |
Distribution Concession Agreement [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible Assets | 5,703,686 | 5,390,063 |
Generation Concession Agreement [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible Assets | 582,671 | 593,852 | R$ 619,221
Gas Distribution [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible Assets |  | 3,619 | R$ 43,888
Other Intangible Assets [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible Assets | 46,254 | 41,563 |
Other [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible Assets | R$ 46,254 | R$ 41,563 |

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