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The change in the amounts related to cash flow hedge accounting - “Platts” index recorded in shareholders’ equity on December 31, 2021, is shown as follows: (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Cash flow hedge accounting - Platts   R$ 825
Income tax and social contribution on cash flow hedge accounting   (280)
Fair Value of cash flow accounting - Platts, net   R$ 545
Movement [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow hedge accounting - Platts R$ 26,903  
Income tax and social contribution on cash flow hedge accounting (9,148)  
Fair Value of cash flow accounting - Platts, net 17,755  
Realization [Member]    
IfrsStatementLineItems [Line Items]    
Cash flow hedge accounting - Platts (27,728)  
Income tax and social contribution on cash flow hedge accounting 9,428  
Fair Value of cash flow accounting - Platts, net R$ (18,300)