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10 Accounts Receivables - Concessions (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 02, 2019 | Dec. 31, 2018
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Accounts Receivable Concessions [Line Items] |  |  |  |
Accounts receivable related to the concession | R$ 1,902,340 | R$ 1,878,369 | R$ 1,796,865 |
Accounts receivable related to the concession, current | 4,515 |  |  |
Accounts receivable related to the concession, noncurrent | 1,897,825 |  |  |
Restated [Member] |  |  |  |
Accounts Receivable Concessions [Line Items] |  |  |  |
Accounts receivable related to the concession |  |  | 65,811 |
Accounts receivable related to the concession, current |  | 4,545 |  | R$ 4,180
Accounts receivable related to the concession, noncurrent |  | 1,873,824 |  | R$ 1,792,685
Power distribution service concession [member] |  |  |  |
Accounts Receivable Concessions [Line Items] |  |  |  |
Accounts receivable related to the concession | 960,518 |  |  |
Power distribution service concession [member] | Restated [Member] |  |  |  |
Accounts Receivable Concessions [Line Items] |  |  |  |
Accounts receivable related to the concession |  | 836,818 | 783,023 |
Piped gas distribution service concession [member] |  |  |  |
Accounts Receivable Concessions [Line Items] |  |  |  |
Accounts receivable related to the concession | 189,416 |  |  |
Piped gas distribution service concession [member] | Restated [Member] |  |  |  |
Accounts Receivable Concessions [Line Items] |  |  |  |
Accounts receivable related to the concession |  | 324,385 | 322,259 |
Bonus from the grant of concession agreements under the quota system [member] |  |  |  |
Accounts Receivable Concessions [Line Items] |  |  |  |
Accounts receivable related to the concession | 671,204 |  |  |
Bonus from the grant of concession agreements under the quota system [member] | Restated [Member] |  |  |  |
Accounts Receivable Concessions [Line Items] |  |  |  |
Accounts receivable related to the concession |  | 647,984 | R$ 625,772 |
Generation concession agreements [member] |  |  |  |
Accounts Receivable Concessions [Line Items] |  |  |  |
Accounts receivable related to the concession | R$ 81,202 |  |  |
Generation concession agreements [member] | Restated [Member] |  |  |  |
Accounts Receivable Concessions [Line Items] |  |  |  |
Accounts receivable related to the concession |  | R$ 69,182 |  |

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