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Schedule of defined benefit obligation (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Cost of service R$ 1,253 R$ 968 R$ 1,093
Interest cost 231,009 236,551 283,487
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 obligations at the beginning of the year 3,645,822 3,581,460 3,087,433
Cost of service 1,253 968 1,093
Interest cost 231,009 236,551 283,487
Participant contributions made in the period 1,398 1,998 2,126
Benefits paid (283,393) (278,960) (269,995)
Actuarial loss/(gain) (444,480) 103,805 477,316
Present value of obligations at the ending of the year R$ 3,151,609 R$ 3,645,822 R$ 3,581,460