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Schedule of expenses by nature (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Expense, net R$ (28,796,921) R$ (21,633,776) R$ (20,117,134)
Cost of sales (25,837,475) (19,124,901) (17,263,264)
Selling expenses (2,372,298) (2,004,417) (2,342,805)
General and administrative expenses (587,148) (504,458) (511,065)
Total (28,796,921) (21,633,776) (20,117,134)
Raw Materials And Inputs [Member]      
IfrsStatementLineItems [Line Items]      
Expense, net (10,405,028) (6,928,517) (7,287,933)
Outsourcing Material [Member]      
IfrsStatementLineItems [Line Items]      
Expense, net (4,476,702) (2,281,619)  
Labor Cost [Member]      
IfrsStatementLineItems [Line Items]      
Expense, net (2,746,454) (2,716,104) (2,807,280)
Supplies [Member]      
IfrsStatementLineItems [Line Items]      
Expense, net (2,297,069) (2,003,761) (1,981,547)
Maintenance Cost Services And Materials [Member]      
IfrsStatementLineItems [Line Items]      
Expense, net (1,268,752) (1,096,358) (1,340,135)
Outsourcing Services [Member]      
IfrsStatementLineItems [Line Items]      
Expense, net (2,119,515) (1,832,081) (2,392,626)
Freights [Member]      
IfrsStatementLineItems [Line Items]      
Expense, net (52,967) (204,932) (334,509)
Distribution Freights [Member]      
IfrsStatementLineItems [Line Items]      
Expense, net (1,782,634) (1,421,079) (1,787,979)
Depreciation Amortization And Depletion [Member]      
IfrsStatementLineItems [Line Items]      
Expense, net (2,114,681) (2,421,458) (1,421,704)
Others One [Member]      
IfrsStatementLineItems [Line Items]      
Expense, net R$ (1,533,119) R$ (727,867) R$ (763,421)