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18. SHARE-BASED PAYMENT (Details)
 12 Months Ended
Dec. 31, 2020
Number
R$ / shares
Dec. 31, 2019
Number
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Options granted | Number 12,075,953  
Outstanding options | Number 7,873,348 5,820,274
Stock option one [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Apr. 26, 2016  
Beginning of the year Apr. 30, 2017  
End of the year Apr. 30, 2021  
Options granted | Number 8,724,733  
Outstanding options | Number 1,275,000  
Fair value of the option | R$ / shares [1] R$ 9.21  
Price of converted share Grant date | R$ / shares [1] 56.00  
Price of converted share Updated IPCA | R$ / shares [1] R$ 69.61  
Stock option two [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date May 31, 2016  
Beginning of the year May 31, 2017  
End of the year May 31, 2021  
Options granted | Number 3,351,220  
Outstanding options | Number 1,145,330  
Fair value of the option | R$ / shares [1] R$ 10.97  
Price of converted share Grant date | R$ / shares [1] 46.68  
Price of converted share Updated IPCA | R$ / shares [1] R$ 57.58  
[1] Amounts expressed in Brazilian Reais.