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35. NON-CASH TRANSACTIONS (Details Narrative) - BRL (R$)
R$ in Millions
 12 Months Ended
Jul. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Non Cash Activities [line items]        
Capitalized financial costs   R$ 33 R$ 23 R$ 30
Addition lease amount   6 R$ 31  
Amount of capital increase R$ 300      
Rio Minas Energia Participacoes S.A. and Luce Empreendimentos e Participacoes S.A. [member]        
Disclosure Of Non Cash Activities [line items]        
Payment of cash arising from acquisition of the subsidiaries   22    
Companhia de transmissao centroeste de minas [member]        
Disclosure Of Non Cash Activities [line items]        
Cash arising from the business combination   27    
Payment made for acquisition   R$ 45