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Cash and cash equivalents - cash and cash equivalents (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and cash equivalents        
Cash and cash equivalents in national currency R$ 444,212 R$ 474,395    
Cash and cash equivalents in foreign currency 20,643 27,595    
Reverse repurchase agreements* (90 days) 35,591 1,652,697    
Total of cash and cash equivalents R$ 500,446 R$ 2,154,687 R$ 3,114,789 R$ 1,546,065