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28. OPERATING COSTS AND EXPENSES (Details Narrative)
R$ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2019
BRL (R$)
N
Dec. 31, 2020
BRL (R$)
N
Dec. 31, 2019
BRL (R$)
Disclosure Of Operating Costs And Expenses [line items]      
Period of eligibility for the severance program   25 years  
Penalty in percentage   20.00%  
Legal payments for severance percentage   50.00%  
Programmed voluntary retirement plan expense R$ 21    
Number of employees completing severance | N 155    
Right of use   R$ (9) R$ 32
Action provisioned at the cost   119 98
Impairment of intangible assets   22  
Cemig [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Right of use   41 R$ 32
PDVP 2020 [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Programmed voluntary retirement plan expense   R$ 59  
Number of employees completing severance | N   396