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Debt to equity ratio: (Details) - BRL (R$)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Aug. 10, 2021
Dec. 31, 2019
Dec. 31, 2018
IfrsStatementLineItems [Line Items]          
Less: Cash and cash equivalents R$ 3,472,845,000 R$ 3,222,768      
Net debt 3,678,444,000 3,188,531,000 R$ 1,431,200    
Equity 22,175,235,000 20,250,518,000   R$ 17,598,212,000 R$ 16,336,214,000
Capital Management [Member]          
IfrsStatementLineItems [Line Items]          
Loans and financing 3,678,444,000 3,188,531,000      
Debentures 8,147,617,000 6,757,481,000      
Less: Cash and cash equivalents (3,472,845,000) (3,222,768,000)      
Less: Bonds and securities (16,121,000) (1,465,000)      
Capital Management [Member] | Indebtedness [Member]          
IfrsStatementLineItems [Line Items]          
Loans and financing 3,738,269,000 3,168,710,000      
Debentures 8,240,769,000 8,540,366,000      
Less: Cash and cash equivalents 3,472,845,000 3,222,768,000      
Less: Bonds and securities 361,058,000 300,530,000      
Net debt 8,145,135,000 8,185,778,000      
Equity R$ 22,175,235,000 R$ 20,250,518,000      
Debit to equity ratio (in R$ per share) R$ 0.37 R$ 0.40