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Intangible assets - Other intangible assets (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Cost [Member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning R$ 11,861,968 R$ 10,656,760
Additions 2,221,363 1,689,388
Write-off (4,327,976) (484,180)
Balance at ending 9,755,355 11,861,968
Cost [Member] | Computer software [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 11,564,209 9,969,742
Additions 1,982,496 1,654,226
Write-off (3,969,781) (59,759)
Balance at ending 9,576,924 11,564,209
Cost [Member] | Other intangible assets [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning 297,759 687,018
Additions 238,867 35,162
Write-off (358,195) (424,421)
Balance at ending 178,431 297,759
Accumulated Amortization [Member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning (6,728,334) (5,982,997)
Additions (1,538,749) (1,144,740)
Write-off 3,894,037 399,403
Balance at ending (4,373,046) (6,728,334)
Accumulated Amortization [Member] | Computer software [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning (6,567,658) (5,499,334)
Additions (1,442,315) (1,079,186)
Write-off 3,710,597 10,862
Balance at ending (4,299,376) (6,567,658)
Accumulated Amortization [Member] | Other intangible assets [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning (160,676) (483,663)
Additions (96,434) (65,554)
Write-off 183,440 388,541
Balance at ending (73,670) (160,676)
Losses From Non Recovery Impairment I T [Member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning (199,715) (150,818)
Write-off 266,738  
Balance at ending (199,715)
Impact on net profit (67,023) (48,897)
Losses From Non Recovery Impairment I T [Member] | Computer software [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning (168,032) (119,135)
Write-off 214,643  
Balance at ending (168,032)
Impact on net profit (46,611) (48,897)
Losses From Non Recovery Impairment I T [Member] | Other intangible assets [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning (31,683) (31,683)
Write-off 52,095  
Balance at ending (31,683)
Impact on net profit (20,412)
Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Balance carrying amount 5,382,309 4,933,919
Gross carrying amount [member] | Computer software [member]    
IfrsStatementLineItems [Line Items]    
Balance carrying amount 5,277,548 4,828,519
Gross carrying amount [member] | Other intangible assets [member]    
IfrsStatementLineItems [Line Items]    
Balance carrying amount R$ 104,761 R$ 105,400