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Schedule of principal categories percentage of plan assets (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Shares 7.77% 9.25%
Fixed income securities 73.95% 72.17%
Real estate property 5.04% 3.71%
Others 13.24% 14.87%
Total 100.00% 100.00%
Assets of the pension plan R$ 579 R$ 627
Non Convertible Debentures Issued By Company And Subsidiaries [member]    
IfrsStatementLineItems [Line Items]    
Assets of the pension plan 302 338
SharesIssued By The Company [member]    
IfrsStatementLineItems [Line Items]    
Assets of the pension plan R$ 277 4
Real Estate Properties By Company [member]    
IfrsStatementLineItems [Line Items]    
Assets of the pension plan   R$ 285