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30. OPERATING COSTS AND EXPENSES (Details Narrative)
R$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2019
BRL (R$)
Number
Mar. 31, 2018
BRL (R$)
Number
Mar. 31, 2019
BRL (R$)
Employee
Dec. 31, 2019
BRL (R$)
Employee
Dec. 31, 2018
BRL (R$)
Employee
Disclosure Of Operating Costs And Expenses [line items]          
Period of eligibility for the severance program   25 years     25 years
Penalty in percentage         40.00%
Programmed voluntary retirement plan expense R$ 21 R$ 65     R$ 214
Number of employees completing severance 155 458     1,189
Right of use       R$ 32  
Action provisioned at the cost       98  
Impairment of intangible assets       22  
Cemig [Member]          
Disclosure Of Operating Costs And Expenses [line items]          
Right of use       32  
Pasep and Cofins Credits [Member]          
Disclosure Of Operating Costs And Expenses [line items]          
Right of use       5  
PDVP 2019 [member]          
Disclosure Of Operating Costs And Expenses [line items]          
Programmed voluntary retirement plan expense     R$ 87 R$ 65 R$ 26
Number of employees completing severance | Employee     613 458 151