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26. EQUITY AND REMUNERATION TO SHAREHOLDERS (Details 4) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 02, 2019
BasicEarningsPerShareLineItems [Line Items]        
Investment-related donations and subsidies R$ 1,857 R$ 1,857 R$ 1,857  
Goodwill on issuance of shares 394 394 394  
Shares in treasury (1) (1) (1)  
Capital reserves and shares in Treasury 2,250 2,250 [1] 2,250  
Legal reserve 995      
Statutory reserve 57      
Retained earnings reserve 6,650      
Unrealized profit reserve 835      
Incentive tax reserve 103      
Reserve for mandatory dividends not distributed 1,420      
Profit reserves      
Restated [member]        
BasicEarningsPerShareLineItems [Line Items]        
Capital reserves and shares in Treasury [2]   2,250   R$ 2,250
Legal reserve   853 853  
Statutory reserve   57 57  
Retained earnings reserve   5,500 3,965  
Unrealized profit reserve   835  
Incentive tax reserve   85 67  
Reserve for mandatory dividends not distributed   1,420 1,420  
Profit reserves   R$ 212 [2] R$ 6,362 R$ 145 [2]
[1] See note 2.8.
[2] For further details of restatement of comparative balances, see Note 2.8