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28. EQUITY AND REMUNERATION TO SHAREHOLDERS (Details 9) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity held by non-controlling , beginning R$ 1,360 R$ 4  
Net profit attributed to non-controlling shareholders 1 42 R$ 1
Capital Increase to non-controlling shareholders 10    
Non-controlling interests arising from business combination   1,315  
Others   (1)  
Proposed dividends to non-controlling shareholders (1)    
Derecognition of the non-controlling interests in Light (Note 34) (1,366)    
Equity held by non-controlling, ending 4 1,360 4
GASMIG [Member]      
Equity held by non-controlling , beginning 4 4  
Net profit attributed to non-controlling shareholders 1 1  
Others   (1)  
Proposed dividends to non-controlling shareholders (1)    
Equity held by non-controlling, ending 4 4 R$ 4
Light SA [member]      
Equity held by non-controlling , beginning 1,277    
Net profit attributed to non-controlling shareholders   41  
Non-controlling interests arising from business combination   1,236  
Derecognition of the non-controlling interests in Light (Note 34) (1,277)    
Equity held by non-controlling, ending   1,277  
Lightger [Member]      
Equity held by non-controlling , beginning 22    
Non-controlling interests arising from business combination   22  
Derecognition of the non-controlling interests in Light (Note 34) (22)    
Equity held by non-controlling, ending   22  
Guanhaes [Member]      
Equity held by non-controlling , beginning 50    
Capital Increase to non-controlling shareholders 10    
Non-controlling interests arising from business combination   50  
Derecognition of the non-controlling interests in Light (Note 34) (60)    
Equity held by non-controlling, ending   50  
Axxion [Member]      
Equity held by non-controlling , beginning 4    
Non-controlling interests arising from business combination   4  
Derecognition of the non-controlling interests in Light (Note 34) (4)    
Equity held by non-controlling, ending   4  
UHE Itaocara [Member]      
Equity held by non-controlling , beginning 3    
Non-controlling interests arising from business combination   3  
Derecognition of the non-controlling interests in Light (Note 34) R$ (3)    
Equity held by non-controlling, ending   R$ 3