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35 Financial Instruments (Details 11) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]        
Less: Cash and cash equivalents R$ 2,941,727 R$ 1,948,409 R$ 1,040,075 R$ 982,073
Net debt 3,142,383 4,047,307    
Equity 17,598,212 16,336,214 R$ 15,510,503 R$ 14,978,142
Capital Management Risk [Member]        
Disclosure of detailed information about financial instruments [line items]        
Loans and financing 3,142,383 4,047,307    
Debentures 8,429,710 7,518,131    
Less: Cash and cash equivalents 2,941,727 1,948,409    
Less: Bonds and securities 3,112 124,862    
Capital Management Risk [Member] | Indebtedness [Member]        
Disclosure of detailed information about financial instruments [line items]        
Loans and financing 3,168,710 4,047,307    
Debentures 8,540,366 7,518,131    
Less: Cash and cash equivalents 2,941,727 1,948,409    
Less: Bonds and securities 282,081 344,296    
Net debt 8,485,268 9,272,733    
Equity R$ 17,598,212 R$ 16,336,214    
Equity indebtedness (in R$ per share) R$ 0.48 R$ 0.57