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Pension plan obligations (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Present value of defined benefit obligations R$ (4,717,463) R$ (4,956,089) R$ (5,662,521)
Fair value of the plan's assets 2,567,272 2,634,427 2,793,927
Liability as per statement of financial position - pension obligations (2,150,191) (2,321,662)  
G 1 Plan [Member]      
IfrsStatementLineItems [Line Items]      
Present value of defined benefit obligations (2,715,388) (2,764,027) (3,112,980)
Fair value of the plan's assets 2,567,272 2,634,427 2,793,927
Liability as per statement of financial position - pension obligations (148,116) (129,600)  
G 0 Plan [Member]      
IfrsStatementLineItems [Line Items]      
Present value of defined benefit obligations (2,002,075) (2,192,062) (2,549,541)
Fair value of the plan's assets
Liability as per statement of financial position - pension obligations R$ (2,002,075) R$ (2,192,062)