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15. REIMBURSEMENT OF TARIFF SUBSIDIES (Details Narrative) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Energy Development Account [line items]      
Subsidies revenue recognized R$ 1,097 R$ 953 R$ 842
Ceming GT [Member]      
Disclosure Of Energy Development Account [line items]      
Current subsidy receivable 3 9  
Cemig D [Member]      
Disclosure Of Energy Development Account [line items]      
Current subsidy receivable R$ 94 R$ 82