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Schedule of actuarial evaluation (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Total liabilities or partially covered R$ 10,973,812 R$ 11,820,184  
Fair value of the plan assets (10,343,368) (11,420,196)  
Plan coverage status 630,444 399,988  
Unrecognized asset 663,765 1,092,501  
Total 1,294,209 1,492,489  
Unified Plan [Member]      
IfrsStatementLineItems [Line Items]      
Total liabilities or partially covered 6,145,601 6,760,824 R$ 6,638,462
Fair value of the plan assets (6,799,255)    
Plan coverage status (653,654)    
Unrecognized asset 653,654    
Total    
Plan I I I [Member]      
IfrsStatementLineItems [Line Items]      
Total liabilities or partially covered 3,337,093 3,344,723 3,046,536
Fair value of the plan assets (3,347,204)    
Plan coverage status (10,111)    
Unrecognized asset 10,111    
Total    
Assistance Plan [Member]      
IfrsStatementLineItems [Line Items]      
Total liabilities or partially covered 1,491,118 R$ 1,714,637 R$ 1,389,610
Fair value of the plan assets (196,909)    
Plan coverage status 1,294,209    
Unrecognized asset    
Total R$ 1,294,209