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8. RECEIVABLES FROM CUSTOMERS, TRADERS AND POWER TRANSPORT CONCESSION HOLDERS (Details Narrative) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Jun. 30, 2019
Disclosure Of Advances From Customers [line items]    
Debts   R$ 240
Impairment R$ 210  
Cemig Distribuicao SA [member]    
Disclosure Of Advances From Customers [line items]    
Reduction in doubtful accounts R$ 46