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24. LOANS, FINANCING AND DEBENTURES (Detaills Narrative) - BRL (R$)
R$ in Millions
1 Months Ended 12 Months Ended
Sep. 26, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]        
Average rate of capitalization rate   6.79% 9.64% 14.28%
Reclassified to current liabilites   R$ 178    
Promissory Notes First Issue Single Series [Member]        
Disclosure of detailed information about borrowings [line items]        
Aggregate amount R$ 850      
Maturity term 12 years      
Interest rate 107.00%      
Cemig GT [Member]        
Disclosure of detailed information about borrowings [line items]        
Aggregate amount   R$ 50