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19 Deferred taxes and contributions (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of deferred taxes and contributions [Line Items]        
Deferred income tax assets R$ 931,736 R$ 905,258 R$ 933,815 R$ 1,054,103
Deferred income tax liabilities (1,252,452) (1,339,254) (1,195,057) (1,090,857)
Deferred tax assets (liabilities), net (320,716) (433,996) R$ (261,242) R$ (36,754)
To be realized within 12 months [member]        
Summary of deferred taxes and contributions [Line Items]        
Deferred income tax assets 263,580 189,740    
Deferred income tax liabilities (31,388) (35,954)    
to be realized after one year [member]        
Summary of deferred taxes and contributions [Line Items]        
Deferred income tax assets 668,156 715,518    
Deferred income tax liabilities R$ (1,221,064) R$ (1,303,300)