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Schedule of liabilities under post-employment benefits (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Post-employment benefits R$ 1,295,174 R$ 1,493,614 R$ 1,194,936
Post-employment benefits 1,295,174 1,493,614  
Post-employment benefits, current 68,836 69,231  
Post-employment benefits, noncurrent 1,226,338 1,424,383  
Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control [member]      
IfrsStatementLineItems [Line Items]      
Post-employment benefits 965 1,124  
Healthcare Plans [Member]      
IfrsStatementLineItems [Line Items]      
Post-employment benefits R$ 1,294,209 R$ 1,492,490