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20 Provisions (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary of provisions [Line Items]    
Significant contingent liabilities R$ 10,460,737 R$ 9,433,489
Customer claims [member]    
Summary of provisions [Line Items]    
Significant contingent liabilities 110,508 86,061
Supplier claims [member]    
Summary of provisions [Line Items]    
Significant contingent liabilities 1,350,308 1,986,736
Other civil claims [member]    
Summary of provisions [Line Items]    
Significant contingent liabilities 758,800 679,623
Tax claims [member]    
Summary of provisions [Line Items]    
Significant contingent liabilities 1,253,636 1,184,811
Labor claims [member]    
Summary of provisions [Line Items]    
Significant contingent liabilities 1,005,648 631,364
Environmental claims [member]    
Summary of provisions [Line Items]    
Significant contingent liabilities R$ 5,981,837 R$ 4,864,894