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Shareholders' equity (Details 1) - BRL (R$)
R$ / shares in Units, R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
IfrsStatementLineItems [Line Items]    
Real R$ 7,620,000 R$ 6,000,000
Interest On Capital [Member]    
IfrsStatementLineItems [Line Items]    
Real R$ 1,500,000 R$ 1,500,000
Interest On Capital [Member] | Ordinary shares [member]    
IfrsStatementLineItems [Line Items]    
Shares R$ 191.68 R$ 191.84
Interest On Capital [Member] | Preference shares [member]    
IfrsStatementLineItems [Line Items]    
Shares 210.84 221.02
Interest On Capital [Member] | Shares Units [Member]    
IfrsStatementLineItems [Line Items]    
Shares 402.52 412.86
Interest On Capital [Member] | Ordinary Shares 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares 162.92 163.06
Interest On Capital [Member] | Preference Shares 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares 179.22 179.37
Interest On Capital [Member] | Shares Units 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares R$ 342.14 R$ 342.43
Interest On Capital 1 [Member]    
IfrsStatementLineItems [Line Items]    
Real R$ 1,500,000 R$ 1,500,000
Interest On Capital 1 [Member] | Ordinary shares [member]    
IfrsStatementLineItems [Line Items]    
Shares R$ 191.39 R$ 191.62
Interest On Capital 1 [Member] | Preference shares [member]    
IfrsStatementLineItems [Line Items]    
Shares 210.53 210.78
Interest On Capital 1 [Member] | Shares Units [Member]    
IfrsStatementLineItems [Line Items]    
Shares 401.92 402.40
Interest On Capital 1 [Member] | Ordinary Shares 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares 162.68 162.88
Interest On Capital 1 [Member] | Preference Shares 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares 178.95 179.16
Interest On Capital 1 [Member] | Shares Units 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares R$ 341.63 R$ 342.04
Interest On Capital 2 [Member]    
IfrsStatementLineItems [Line Items]    
Real R$ 2,000,000 R$ 1,500,000
Interest On Capital 2 [Member] | Ordinary shares [member]    
IfrsStatementLineItems [Line Items]    
Shares R$ 255.18 R$ 191.67
Interest On Capital 2 [Member] | Preference shares [member]    
IfrsStatementLineItems [Line Items]    
Shares 280.70 210.83
Interest On Capital 2 [Member] | Shares Units [Member]    
IfrsStatementLineItems [Line Items]    
Shares 535.88 402.50
Interest On Capital 2 [Member] | Ordinary Shares 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares 216.90 162.92
Interest On Capital 2 [Member] | Preference Shares 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares 238.59 179.21
Interest On Capital 2 [Member] | Shares Units 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares R$ 455.49 R$ 342.13
Interest On Capital 3 [Member]    
IfrsStatementLineItems [Line Items]    
Real R$ 2,000,000 R$ 1,300,000
Interest On Capital 3 [Member] | Ordinary shares [member]    
IfrsStatementLineItems [Line Items]    
Shares R$ 255.18 R$ 166.10
Interest On Capital 3 [Member] | Preference shares [member]    
IfrsStatementLineItems [Line Items]    
Shares 280.70 182.71
Interest On Capital 3 [Member] | Shares Units [Member]    
IfrsStatementLineItems [Line Items]    
Shares 535.88 348.81
Interest On Capital 3 [Member] | Ordinary Shares 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares 216.90 141.18
Interest On Capital 3 [Member] | Preference Shares 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares R$ 238.59 155.30
Interest On Capital 3 [Member] | Shares Units 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares   R$ 296.48
Dividends [Member]    
IfrsStatementLineItems [Line Items]    
Real R$ 620,000 R$ 200,000
Dividends [Member] | Ordinary shares [member]    
IfrsStatementLineItems [Line Items]    
Shares R$ 79.10 R$ 25.55
Dividends [Member] | Preference shares [member]    
IfrsStatementLineItems [Line Items]    
Shares 87.01 28.11
Dividends [Member] | Shares Units [Member]    
IfrsStatementLineItems [Line Items]    
Shares 166.11 53.66
Dividends [Member] | Ordinary Shares 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares 67.23 25.55
Dividends [Member] | Preference Shares 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares 73.96 28.11
Dividends [Member] | Shares Units 1 [Member]    
IfrsStatementLineItems [Line Items]    
Shares R$ 141.19 R$ 53.66