v3.26.1
Loan and lease operations - Schedule of Reconciliation of Gross Portfolio of Loans (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about borrowings [line items]    
Beginning balance R$ 47,758  
Ending balance 49,069 R$ 47,758
Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 1,025,493 910,590
Acquisition / (Settlement) 91,605 146,210
Write-off (33,300) (31,307)
Ending balance 1,083,798 1,025,493
Individuals | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 445,574 416,616
Acquisition / (Settlement) 52,762 53,114
Write-off (25,110) (24,156)
Ending balance 473,226 445,574
Companies | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 357,633 307,645
Acquisition / (Settlement) 27,794 55,583
Write-off (5,139) (5,595)
Ending balance 380,288 357,633
Foreign units Latin America | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 222,286 186,329
Acquisition / (Settlement) 11,049 37,513
Write-off (3,051) (1,556)
Ending balance 230,284 222,286
Stage 1 | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 876,653 760,654
Transfer to Stage 2 (48,008) 74,727
Transfer to Stage 3 (7,402) 3,807
Cure from Stage 2 53,189 43,856
Cure from Stage 3 2,208 477
Acquisition / (Settlement) 104,377 150,200
Write-off 0 0
Ending balance 981,017 876,653
Stage 1 | Foreign units Latin America | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 196,464 164,907
Transfer to Stage 2 (10,101) 8,863
Transfer to Stage 3 (1,166) 884
Cure from Stage 2 9,542 3,378
Cure from Stage 3 1,347 22
Acquisition / (Settlement) 14,859 37,904
Write-off 0 0
Ending balance 210,945 196,464
Stage 1 | Individuals | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 347,749 317,335
Transfer to Stage 2 (29,288) 53,024
Transfer to Stage 3 (4,101) 1,189
Cure from Stage 2 36,920 35,139
Cure from Stage 3 355 243
Acquisition / (Settlement) 59,172 49,245
Write-off 0 0
Ending balance 410,807 347,749
Stage 1 | Companies | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 332,440 278,412
Transfer to Stage 2 (8,619) 12,840
Transfer to Stage 3 (2,135) 1,734
Cure from Stage 2 6,727 5,339
Cure from Stage 3 506 212
Acquisition / (Settlement) 30,346 63,051
Write-off 0 0
Ending balance 359,265 332,440
Stage 2 | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 93,709 89,699
Transfer to Stage 3 (25,406) 24,728
Cure from Stage 3 11,115 2,320
Acquisition / (Settlement) (19,293) (4,453)
Write-off 0 0
Cure to Stage 1 (53,189) 43,856
Transfer from Stage 1 48,008 74,727
Ending balance 54,944 93,709
Stage 2 | Foreign units Latin America | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 14,004 12,077
Transfer to Stage 3 (4,474) 4,601
Cure from Stage 3 2,287 475
Acquisition / (Settlement) (2,047) 568
Write-off 0 0
Cure to Stage 1 (9,542) 3,378
Transfer from Stage 1 10,101 8,863
Ending balance 10,329 14,004
Stage 2 | Individuals | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 66,468 63,579
Transfer to Stage 3 (14,712) 14,153
Cure from Stage 3 6,652 1,307
Acquisition / (Settlement) (15,907) (2,150)
Write-off 0 0
Cure to Stage 1 (36,920) 35,139
Transfer from Stage 1 29,288 53,024
Ending balance 34,869 66,468
Stage 2 | Companies | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 13,237 14,043
Transfer to Stage 3 (6,220) 5,974
Cure from Stage 3 2,176 538
Acquisition / (Settlement) (1,339) (2,871)
Write-off 0 0
Cure to Stage 1 (6,727) 5,339
Transfer from Stage 1 8,619 12,840
Ending balance 9,746 13,237
Stage 3 | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 55,131 60,237
Acquisition / (Settlement) 6,521 463
Write-off (33,300) (31,307)
Cure to Stage 1 (2,208) 477
Cure to Stage 2 (11,115)  
Transfer from Stage 1 7,402 3,807
Cure to Stage 2   (2,320)
Transfer from Stage 2 25,406 24,728
Ending balance 47,837 55,131
Stage 3 | Foreign units Latin America | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 11,818 9,345
Acquisition / (Settlement) (1,763) (959)
Write-off (3,051) (1,556)
Cure to Stage 1 (1,347) 22
Cure to Stage 2 (2,287)  
Transfer from Stage 1 1,166 884
Cure to Stage 2   (475)
Transfer from Stage 2 4,474 4,601
Ending balance 9,010 11,818
Stage 3 | Individuals | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 31,357 35,702
Acquisition / (Settlement) 9,497 6,019
Write-off (25,110) (24,156)
Cure to Stage 1 (355) 243
Cure to Stage 2 (6,652)  
Transfer from Stage 1 4,101 1,189
Cure to Stage 2   (1,307)
Transfer from Stage 2 14,712 14,153
Ending balance 27,550 31,357
Stage 3 | Companies | Gross carrying amount    
Disclosure of detailed information about borrowings [line items]    
Beginning balance 11,956 15,190
Acquisition / (Settlement) (1,213) (4,597)
Write-off (5,139) (5,595)
Cure to Stage 1 (506) 212
Cure to Stage 2 (2,176)  
Transfer from Stage 1 2,135 1,734
Cure to Stage 2   (538)
Transfer from Stage 2 6,220 5,974
Ending balance R$ 11,277 R$ 11,956