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Schedule of estimated net periodic plan costs (gains) (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
BRL (R$)
Plan I I I [Member]  
IfrsStatementLineItems [Line Items]  
Cost of current service R$ 4,021
Estimated cost of interest 364,900
Expected return on plan assets (363,906)
Expected employee contributions (2,010)
Costs (income or loss) 3,005
Assistance Plan [Member]  
IfrsStatementLineItems [Line Items]  
Cost of current service 6,172
Estimated cost of interest 155,389
Expected return on plan assets (21,269)
Expected employee contributions
Costs (income or loss) 140,292
Unified Plan [Member]  
IfrsStatementLineItems [Line Items]  
Cost of current service 309
Estimated cost of interest 673,723
Expected return on plan assets (725,888)
Expected employee contributions (139)
Costs (income or loss) R$ (51,995)