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35 Financial Instruments (Details 11) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]        
Less: Cash and cash equivalents R$ 3,222,768 R$ 2,941,727    
Net debt 3,188,531 3,142,383    
Equity 20,250,518 17,598,212 R$ 16,336,214 R$ 15,345,579
Capital Management Risk [member]        
Disclosure of detailed information about financial instruments [line items]        
Loans and financing 3,188,531 3,142,383    
Debentures 6,757,481 8,429,710    
Less: Cash and cash equivalents 3,222,768 2,941,727    
Less: Bonds and securities 1,465 3,112    
Capital Management Risk [member] | Indebtedness [member]        
Disclosure of detailed information about financial instruments [line items]        
Loans and financing 3,214,249 3,168,710    
Debentures 6,837,819 8,540,366    
Less: Cash and cash equivalents 3,222,768 2,941,727    
Less: Bonds and securities 300,530 282,081    
Net debt 6,528,770 8,485,268    
Equity R$ 20,250,518 R$ 17,598,212    
Debit to equity ratio (in R$ per share) R$ 0.32 R$ 0.48