v3.26.1
Goodwill and Intangible assets - Schedule of Goodwill and Intangible Assets (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance R$ 23,997 R$ 23,364
Ending balance 24,099 23,997
Book value 24,099 23,997
Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 53,116 46,838
Acquisitions 6,212 5,535
Termination / write-offs (759) (872)
Exchange variation (174) 1,612
Other 8 3
Ending balance 58,403 53,116
Amortization    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (21,822) (17,143)
Termination / write-offs 491 602
Exchange variation 0 (442)
Other 16 17
Ending balance (26,518) (21,822)
Amortization expense (5,203) (4,856)
Impairment    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (7,297) (6,331)
Exchange variation 69 (629)
Ending balance (7,786) (7,297)
Increase (558) (337)
Goodwill and intangible from incorporation    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Book value 8,345 8,349
Goodwill and intangible from incorporation | Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 13,317 12,255
Acquisitions 60 135
Exchange variation (160) 927
Other   0
Ending balance 13,218 13,317
Goodwill and intangible from incorporation | Impairment    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (4,968) (4,420)
Exchange variation 95 (548)
Ending balance R$ (4,873) R$ (4,968)
Association for the promotion and offer of financial products and services    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Annual amortization rates 8.00% 8.00%
Book value R$ 179 R$ 259
Association for the promotion and offer of financial products and services | Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 2,366 2,227
Termination / write-offs   (7)
Exchange variation 41 162
Other (16) (16)
Ending balance 2,391 2,366
Association for the promotion and offer of financial products and services | Amortization    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (1,378) (1,242)
Termination / write-offs   6
Exchange variation (16) (76)
Other 16 16
Ending balance (1,457) (1,378)
Amortization expense (79) (82)
Association for the promotion and offer of financial products and services | Impairment    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (729) (648)
Exchange variation (26) (81)
Ending balance R$ (755) R$ (729)
Software acquired    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Annual amortization rates 20.00% 20.00%
Book value R$ 1,666 R$ 1,377
Software acquired | Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 5,869 5,177
Acquisitions 789 412
Termination / write-offs (9) (5)
Exchange variation (6) 263
Other 30 22
Ending balance 6,673 5,869
Software acquired | Amortization    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (4,318) (3,713)
Termination / write-offs 5 4
Exchange variation (11) (162)
Other   1
Ending balance (4,833) (4,318)
Amortization expense (509) (448)
Software acquired | Impairment    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (174) (174)
Ending balance R$ (174) R$ (174)
Internally developed software    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Annual amortization rates 20.00% 20.00%
Book value R$ 11,027 R$ 10,685
Internally developed software | Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 23,568 19,577
Acquisitions 4,556 4,125
Termination / write-offs (261) (269)
Exchange variation (28) 138
Other (7) (3)
Ending balance 27,828 23,568
Internally developed software | Amortization    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (11,557) (8,422)
Termination / write-offs   1
Exchange variation 8 (88)
Ending balance (14,917) (11,557)
Amortization expense (3,368) (3,048)
Internally developed software | Impairment    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (1,326) (1,089)
Ending balance (1,884) (1,326)
Increase (558) (237)
Other intangible assets    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Book value 2,882 3,327
Other intangible assets | Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 7,996 7,602
Acquisitions 807 863
Termination / write-offs (489) (591)
Exchange variation (21) 122
Ending balance 8,293 7,996
Other intangible assets | Amortization    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (4,569) (3,766)
Termination / write-offs 486 591
Exchange variation 19 (116)
Ending balance (5,311) (4,569)
Amortization expense (1,247) (1,278)
Other intangible assets | Impairment    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (100)  
Ending balance R$ (100) (100)
Increase   R$ (100)
Other intangible assets | Minimum    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Annual amortization rates 10.00% 10.00%
Other intangible assets | Maximum    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Annual amortization rates 20.00% 20.00%