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13. REIMBURSEMENT OF TARIFF SUBSIDIES (Details Narrative) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Energy Development Account [line items]      
Subsidies revenue recognized R$ 1,057 R$ 1,097 R$ 953
Ceming GT [member]      
Disclosure Of Energy Development Account [line items]      
Current subsidy receivable 6 3  
Cemig D [member]      
Disclosure Of Energy Development Account [line items]      
Current subsidy receivable R$ 88 R$ 94