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8. RECEIVABLES FROM CUSTOMERS, TRADERS AND POWER TRANSPORT CONCESSION HOLDERS (Details 1) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Allowance account for credit losses of financial assets R$ 712 R$ 810
Residential [member]    
Disclosure of financial assets [line items]    
Allowance account for credit losses of financial assets 110 131
Industrial [member]    
Disclosure of financial assets [line items]    
Allowance account for credit losses of financial assets 188 197
Commercial, services and others [member]    
Disclosure of financial assets [line items]    
Allowance account for credit losses of financial assets 190 161
Rural [member]    
Disclosure of financial assets [line items]    
Allowance account for credit losses of financial assets 30 32
Public authorities [member]    
Disclosure of financial assets [line items]    
Allowance account for credit losses of financial assets 83 201
Public lighting [member]    
Disclosure of financial assets [line items]    
Allowance account for credit losses of financial assets 2 2
Public services [member]    
Disclosure of financial assets [line items]    
Allowance account for credit losses of financial assets 35 31
Charges for use of the network (TUSD) [member]    
Disclosure of financial assets [line items]    
Allowance account for credit losses of financial assets R$ 74 R$ 55