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26. EQUITY AND REMUNERATION TO SHAREHOLDERS (Details 7) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement of changes in equity [abstract]    
Beginning balance R$ 744 R$ 864
Proposed dividends 1,482 764
Proposed dividends - Non-controlling interests 1  
Withholding income tax on interest on capital (50) (35)
Dividends retained - Minas Gerais state government (Note 11) (130) (148)
Dividends paid 598 (701)
Ending balance R$ 1,449 R$ 744