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Schedule of reconciliation of employee benefits' assets and liabilities (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IfrsStatementLineItems [Line Items]        
Fair value of plan assets R$ 567,300      
[custom:LiabilitiesOfBenefitPlan-0] 584,288 R$ 758,426    
Assets (59,111) (13,819)    
Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control [member]        
IfrsStatementLineItems [Line Items]        
Present value of defined benefit obligation 3,151,609 3,645,822 R$ 3,581,460 R$ 3,087,433
Fair value of plan assets (3,584,244) (3,766,194) (3,894,488)  
Deficit(Surplus) (432,635) (120,372) (313,028)  
Restriction to actuarial assets due to recovery limitation 373,524 186,099 319,102  
Net (assets) recognized in the balance sheet (59,111) 65,727 6,074  
[custom:LiabilitiesOfBenefitPlan-0]   79,546 19,788  
Assets R$ (59,111) R$ (13,819) R$ (13,714)