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22. LOANS, FINANCING AND DEBENTURES (Detaills Narrative) - BRL (R$)
R$ in Millions
 1 Months Ended 12 Months Ended
Sep. 26, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]        
Average rate of capitalization rate   5.39%    
Promissory Notes First Issue Single Series [member]        
Disclosure of detailed information about borrowings [line items]        
Aggregate amount R$ 850      
Maturity term 11 years      
Interest rate 5.27%      
Cemig GT [member]        
Disclosure of detailed information about borrowings [line items]        
Aggregate amount   R$ 50    
Restated [member]        
Disclosure of detailed information about borrowings [line items]        
Average rate of capitalization rate     6.79% 9.64%