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22. SUPPLIERS (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
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