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Employee benefits - Remeasurement of the fair value of plans (Details) - Performance Share Unit Program [Member]
Jun. 30, 2023
Dec. 31, 2022
Shares Granted Measurement Input [Member]    
IfrsStatementLineItems [Line Items]    
Measurement unit 1,177,755 1,709,955
Shares Granted Share Price Brl [Member]    
IfrsStatementLineItems [Line Items]    
Measurement unit 88.88 78.00
Share Granted Share Price Brl [Member]    
IfrsStatementLineItems [Line Items]    
Measurement unit 16.60 13.81
Historical volatility for shares, measurement input [member]    
IfrsStatementLineItems [Line Items]    
Measurement unit 48.33 39.00
Expected Term Measurement Input [Member]    
IfrsStatementLineItems [Line Items]    
Measurement unit 3 3
Expected Value Of Performance Factor Measurement Input [Member]    
IfrsStatementLineItems [Line Items]    
Measurement unit 72.42 53.08