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FINANCIAL INSTRUMENTS - Net investment hedge (Details)
R$ in Thousands, $ in Billions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Net investment hedge        
Gain (loss) on net investment hedge, recognized in OCI   R$ (2,504,914) R$ (322,948) R$ (1,491,534)
Ten/Thirty Years Bonds        
Net investment hedge        
Gain (loss) on net investment hedge, recognized in income     R$ (322,948,000)  
Ten/Thirty Years Bonds | Hedges of net investment in foreign operations        
Net investment hedge        
Gain (loss) on net investment hedge, recognized in OCI | $ $ 2.1      
Gain (loss) on net investment hedge, recognized in income   R$ (2,504,914,000)