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8. RECEIVABLES FROM CUSTOMERS, TRADERS AND POWER TRANSPORT CONCESSION HOLDERS (Details 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Advances From Customers [line items]    
Beginning balance R$ 79  
Ending Balance R$ 79
Cemig GT [Member]    
Disclosure Of Advances From Customers [line items]    
Beginning balance   233
Additions   50
Energy supplied   (215)
Inflation adjustment   11
Eletrobras [Member]    
Disclosure Of Advances From Customers [line items]    
Beginning balance 79  
Energy supplied (80)  
Inflation adjustment 1  
Ending Balance R$ 79