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21. EQUITY (Details 3) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EquityAbstractLineItems [Line Items]      
Capital reserve R$ 142,080 R$ 192,845  
Capital reserve [member]      
EquityAbstractLineItems [Line Items]      
Result on sale and exchange of shares 125,532 125,532 R$ 125,532
Share based payment 223,191 223,011 229,872
Acquisition of non-controlling entities (206,423) (155,478) (239,830)
Capital transactions with subsidiaries (220) (220) (220)
Capital reserve R$ 142,080 R$ 192,845 R$ 115,354