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8. RECEIVABLES FROM CUSTOMERS, TRADERS AND POWER TRANSPORT CONCESSION HOLDERS (Details 1) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | R$ 810 | R$ 751 | R$ 568 | R$ 660
Residential [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 131 | 137 |  |
Industrial [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 197 | 172 |  |
Commercial, Services and Other [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 161 | 189 |  |
Rural [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 32 | 33 |  |
Public Authorities [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 201 | 119 |  |
Public Lighting [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 2 | 6 |  |
Public Service [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | 31 | 27 |  |
Network Fees [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Allowance account for credit losses of financial assets | R$ 55 | R$ 68 |  |

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