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22. SUPPLIERS (Details) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of trade payables [line items] |  |
Total Suppliers | R$ 2,080 | R$ 1,801
Energy Purchased For Resale [Member] |  |
Disclosure of trade payables [line items] |  |
Total Suppliers | 764 | 775
Charges For Use Of Energy Network [Member] |  |
Disclosure of trade payables [line items] |  |
Total Suppliers | 145 | 122
Energy On Spot Market Cmara De Comercializao De Energia Eltrica [Member] |  |
Disclosure of trade payables [line items] |  |
Total Suppliers | 401 | 139
Materials And Service Suppliers [Member] |  |
Disclosure of trade payables [line items] |  |
Total Suppliers | 384 | 373
Gas Purchased For Resale [Member] |  |
Disclosure of trade payables [line items] |  |
Total Suppliers | 143 | 124
Itaipu Binacional [Member] |  |
Disclosure of trade payables [line items] |  |
Total Suppliers | R$ 243 | R$ 268

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