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26. EQUITY AND REMUNERATION TO SHAREHOLDERS (Details 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity And Remuneration To Shareholders      
Adjustments to actuarial liabilities - Employee benefits R$ (340) R$ (343) R$ (257)
Subsidiary and jointly-controlled entity      
Adjustments to actuarial liabilities - Employee benefits (2,660) (2,650) (1,681)
Deemed cost of PP&E 569 586 611
Total (2,091) (2,064) (1,070)
Equity valuation adjustments R$ (2,431) R$ (2,407) R$ (1,327)