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Schedule of cash and cash equivalents (Details) - BRL (R$)
Sep. 30, 2021
Dec. 31, 2020
CashAndCashEquivalentLineItems [Line Items]    
Cash R$ 2,203,097,000 R$ 2,439,072,000
Cash equivalents 6,889,844,000 7,576,625,000
Turkey, New Lira    
CashAndCashEquivalentLineItems [Line Items]    
Cash 660,171,000 347,740,000
United States of America, Dollars    
CashAndCashEquivalentLineItems [Line Items]    
Cash 633,222,000 1,185,208,000
United States of America, Dollars | Fixed term deposit [Member]    
CashAndCashEquivalentLineItems [Line Items]    
Cash equivalents 198,878,000
United States of America, Dollars | Overnight [Member]    
CashAndCashEquivalentLineItems [Line Items]    
Cash equivalents 600,449,000 1,220,232,000
Saudi Arabia, Riyals    
CashAndCashEquivalentLineItems [Line Items]    
Cash 351,645,000 250,879,000
Brazilian reais [Member]    
CashAndCashEquivalentLineItems [Line Items]    
Cash 117,762,000 112,181,000
Cash equivalents 4,086,298,000 3,667,132,000
Brazilian reais [Member] | Investment funds [member]    
CashAndCashEquivalentLineItems [Line Items]    
Cash equivalents 4,120,000 4,684,000
Brazilian reais [Member] | Bank deposit certificates [Member]    
CashAndCashEquivalentLineItems [Line Items]    
Cash equivalents 4,082,178,000 3,662,448,000
Euro Member Countries, Euro    
CashAndCashEquivalentLineItems [Line Items]    
Cash 67,973,000 54,687,000
Others currencies [Member]    
CashAndCashEquivalentLineItems [Line Items]    
Cash 372,324,000 488,377,000
Cash equivalents 600,449,000 1,470,421,000
Others currencies [Member] | Fixed term deposit [Member]    
CashAndCashEquivalentLineItems [Line Items]    
Cash equivalents R$ 51,311,000