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Goodwill and Intangible assets (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Beginning balance R$ 23,364 R$ 23,114
Ending balance 23,997 23,364
Book value 23,997 23,364
Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance 46,838 43,942
Acquisitions 5,535 5,376
Termination / disposals (872) (988)
Exchange variation 1,612 (915)
Amortization other 3 (577)
Ending balance 53,116 46,838
Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (17,143) (14,393)
Termination / disposals 602 854
Exchange variation (442) 132
Amortization other 17 353
Ending balance (21,822) (17,143)
Amortization expense (4,856) (4,089)
Accumulated impairment [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (6,331) (6,435)
Exchange variation (629) 372
Ending balance (7,297) (6,331)
Increase R$ (337) R$ (268)
Promotion And Offer Of Financial Products And Service [Member]    
IfrsStatementLineItems [Line Items]    
Annual amortization rates 8.00% 8.00%
Book value R$ 259 R$ 337
Promotion And Offer Of Financial Products And Service [Member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance 2,227 2,366
Termination / disposals (7) (246)
Exchange variation 162 133
Amortization other (16) (26)
Ending balance 2,366 2,227
Promotion And Offer Of Financial Products And Service [Member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (1,242) (1,357)
Termination / disposals 6 227
Exchange variation (76) (49)
Amortization other 16 24
Ending balance (1,378) (1,242)
Amortization expense (82) (87)
Promotion And Offer Of Financial Products And Service [Member] | Accumulated impairment [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (648) (559)
Exchange variation (81) (89)
Ending balance R$ (729) R$ (648)
Software Acquisition [Member]    
IfrsStatementLineItems [Line Items]    
Annual amortization rates 20.00% 20.00%
Book value R$ 1,377 R$ 1,290
Software Acquisition [Member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance 5,177 5,423
Acquisitions 412 452
Termination / disposals (5) (100)
Exchange variation 263 (56)
Amortization other 22 (542)
Ending balance 5,869 5,177
Software Acquisition [Member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (3,713) (3,737)
Termination / disposals 4 58
Exchange variation (162) 18
Amortization other 1 379
Ending balance (4,318) (3,713)
Amortization expense (448) (431)
Software Acquisition [Member] | Accumulated impairment [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (174) (171)
Ending balance R$ (174) (174)
Increase   R$ (3)
Intangible assets under development [member]    
IfrsStatementLineItems [Line Items]    
Annual amortization rates 20.00% 20.00%
Book value R$ 10,685 R$ 10,066
Intangible assets under development [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance 19,577 16,088
Acquisitions 4,125 3,634
Termination / disposals (269) (43)
Exchange variation 138 (95)
Amortization other (3) (7)
Ending balance 23,568 19,577
Intangible assets under development [member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (8,422) (6,133)
Termination / disposals 1  
Exchange variation (88) 56
Amortization other   (50)
Ending balance (11,557) (8,422)
Amortization expense (3,048) (2,295)
Intangible assets under development [member] | Accumulated impairment [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (1,089) (824)
Ending balance (1,326) (1,089)
Increase (237) (265)
Other intangible assets [member]    
IfrsStatementLineItems [Line Items]    
Book value 3,327 3,836
Other intangible assets [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance 7,602 7,634
Acquisitions 863 687
Termination / disposals (591) (599)
Exchange variation 122 (120)
Ending balance 7,996 7,602
Other intangible assets [member] | Accumulated depreciation and amortisation [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (3,766) (3,166)
Termination / disposals 591 569
Exchange variation (116) 107
Ending balance (4,569) (3,766)
Amortization expense (1,278) (1,276)
Other intangible assets [member] | Accumulated impairment [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance  
Ending balance (100)
Increase R$ (100)  
Other intangible assets [member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Annual amortization rates 10.00% 10.00%
Other intangible assets [member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Annual amortization rates 20.00% 20.00%
Goodwill And Intangible Assets From Acquisition [Member]    
IfrsStatementLineItems [Line Items]    
Book value R$ 8,349 R$ 7,835
Goodwill And Intangible Assets From Acquisition [Member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance 12,255 12,431
Acquisitions 135 603
Exchange variation 927 (777)
Amortization other   (2)
Ending balance 13,317 12,255
Goodwill And Intangible Assets From Acquisition [Member] | Accumulated impairment [member]    
IfrsStatementLineItems [Line Items]    
Beginning balance (4,420) (4,881)
Exchange variation (548) 461
Ending balance R$ (4,968) R$ (4,420)