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Retirement plans liabilities (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [abstract]    
Beginning balance R$ 45,733,815 R$ 31,921,400
Contributions received 3,333,361 3,007,321
Transfer with third party plans 5,562,491 10,580,681
Claims paid (210) 0
Withdraws (3,847,214) (3,441,303)
Other provisions (Constitution/Reversion) (9,185) (54,828)
Monetary correction and interest income (5,617,647) (3,610,888)
Ending balance R$ 56,409,075 R$ 45,733,815