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35. Insurance (Details Narrative)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Cemig Distribuicao [Member] | Operational Risk [Member]  
Disclosure of types of insurance contracts [line items]  
Expense arising from other energy distribution equipment R$ 1,000
Cemig Geracao E Transmissao [Member]  
Disclosure of types of insurance contracts [line items]  
Maximum indemnity limit 231
Cemig Geracao E Transmissao [Member] | Operational Risk [Member]  
Disclosure of types of insurance contracts [line items]  
Expense arising from other energy distribution equipment R$ 1,000