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20 Provisions (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary of provisions [Line Items]    
Provisions R$ 1,283,662 R$ 1,078,451
Escrow deposits (31,360) (42,643)
Total 1,252,302 1,035,808
Customer claims [member]    
Summary of provisions [Line Items]    
Provisions 160,705 253,665
Escrow deposits (10,553) (9,973)
Total 150,152 243,692
Supplier claims [member]    
Summary of provisions [Line Items]    
Provisions 410,734 153,654
Escrow deposits (358) (298)
Total 410,376 153,356
Other civil claims [member]    
Summary of provisions [Line Items]    
Provisions 86,083 93,910
Escrow deposits (2,505) (16,496)
Total 83,578 77,414
Tax claims [member]    
Summary of provisions [Line Items]    
Provisions 59,678 59,143
Escrow deposits (2,410) (3,518)
Total 57,268 55,625
Labor claims [member]    
Summary of provisions [Line Items]    
Provisions 316,880 325,129
Escrow deposits (15,503) (12,329)
Total 301,377 312,800
Environmental claims [member]    
Summary of provisions [Line Items]    
Provisions 249,582 192,950
Escrow deposits (31) (29)
Total 249,551 192,921
Current [member]    
Summary of provisions [Line Items]    
Provisions 760,209 550,247
Escrow deposits 0 0
Total 760,209 550,247
Noncurrent [member]    
Summary of provisions [Line Items]    
Provisions 523,453 528,204
Escrow deposits (31,360) (42,643)
Total R$ 492,093 R$ 485,561