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28. EQUITY AND REMUNERATION TO SHAREHOLDERS (Details 8) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of changes in equity [abstract]      
Beginning balance R$ 864 R$ 428  
Proposed dividends 764 867 R$ 500
Withholding income tax on interest on capital (35) (17)  
Dividends retained - Minas Gerais state government (Note 13) (148) 127  
Dividends paid (701)    
Proposed dividends of previous years   (42)  
Expired dividends   (8)  
Ending balance R$ 744 R$ 864 R$ 428