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Schedule of changes in fair value of the plan assets (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Fair value of plan assets at the beginning of the year R$ 3,766,193 R$ 3,894,488  
Return on plan assets (less interest income) 138,488 109,279 R$ (444,348)
Fair value of plan assets at the end of the year 3,584,244 3,766,193 3,894,488
Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control [member]      
IfrsStatementLineItems [Line Items]      
Fair value of plan assets at the beginning of the year (3,766,193) (3,894,488) (3,403,906)
Interest income (238,534) (257,946) (314,102)
Benefits paid 283,393 278,960 269,995
Participant contributions made in the period (1,398) (1,998) (2,127)
Return on plan assets (less interest income) 138,488 109,279 (444,348)
Fair value of plan assets at the end of the year R$ (3,584,244) R$ (3,766,193) R$ (3,894,488)