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Stockholders’ equity (Details Narrative)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
$ / shares
shares
Dec. 31, 2024
BRL (R$)
Dec. 31, 2023
shares
Dec. 31, 2022
shares
IfrsStatementLineItems [Line Items]        
Shares of capital stock, ending balance 9,804,135,348   9,804,135,348 9,804,135,348
Outstanding shares 9,776,104,515   9,803,698,677 9,800,866,660
Adjusted net income rate   25.00%    
Non-cumulative per share | $ / shares $ 0.022      
Dividends per share | $ / shares $ 0.015      
Net income remaining after the distribution of dividends and appropriations to statutory reserves | R$   R$ 854    
Ordinary shares [member]        
IfrsStatementLineItems [Line Items]        
Shares of capital stock, ending balance 4,958,290,359   4,958,290,359 4,958,290,359
Outstanding shares 4,958,290,359   4,958,290,359 4,958,290,359
Preference shares [member]        
IfrsStatementLineItems [Line Items]        
Shares of capital stock, ending balance 4,845,844,989   4,845,844,989 4,845,844,989
Outstanding shares 4,817,814,156   4,845,408,318 4,842,576,301