v3.26.1
Securities at fair value through profit or loss (FVPL) - Schedule of Financial Assets And Liabilities (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Total R$ 2,042,788 R$ 1,912,804
Financial assets at fair value through profit or loss, classified as held for trading, category    
Disclosure of financial assets [line items]    
Total 615,559 571,840
Fair value adjustment (2,290) (12,015)
Fair value 613,269 559,825
Financial assets at fair value through profit or loss, classified as held for trading, category | Government securities    
Disclosure of financial assets [line items]    
Total 402,880 372,751
Fair value adjustment (6) (5,201)
Fair value 402,874 367,550
Financial assets at fair value through profit or loss, classified as held for trading, category | Government securities | Brazil    
Disclosure of financial assets [line items]    
Total 396,394 366,857
Fair value adjustment 64 (5,161)
Fair value 396,458 361,696
Financial assets at fair value through profit or loss, classified as held for trading, category | Government securities | Latin America    
Disclosure of financial assets [line items]    
Total 6,085 4,404
Fair value adjustment (70) (23)
Fair value 6,015 4,381
Financial assets at fair value through profit or loss, classified as held for trading, category | Government securities | Abroad    
Disclosure of financial assets [line items]    
Total 401 1,490
Fair value adjustment 0 (17)
Fair value 401 1,473
Financial assets at fair value through profit or loss, classified as held for trading, category | Corporate securities    
Disclosure of financial assets [line items]    
Total 147,915 133,587
Fair value adjustment (2,540) (4,295)
Fair value 145,375 129,292
Financial assets at fair value through profit or loss, classified as held for trading, category | Corporate securities | Rural product note    
Disclosure of financial assets [line items]    
Total 634 972
Fair value adjustment 2 (31)
Fair value 636 941
Financial assets at fair value through profit or loss, classified as held for trading, category | Corporate securities | Bank deposit certificates    
Disclosure of financial assets [line items]    
Total 1,108 450
Fair value adjustment 0 0
Fair value 1,108 450
Financial assets at fair value through profit or loss, classified as held for trading, category | Corporate securities | Real estate receivables certificates    
Disclosure of financial assets [line items]    
Total 2,134 1,754
Fair value adjustment (88) (100)
Fair value 2,046 1,654
Financial assets at fair value through profit or loss, classified as held for trading, category | Corporate securities | Debentures    
Disclosure of financial assets [line items]    
Total 100,376 91,544
Fair value adjustment (2,470) (4,402)
Fair value 97,906 87,142
Financial assets at fair value through profit or loss, classified as held for trading, category | Corporate securities | Eurobonds and other    
Disclosure of financial assets [line items]    
Total 3,093 2,017
Fair value adjustment 5 (26)
Fair value 3,098 1,991
Financial assets at fair value through profit or loss, classified as held for trading, category | Corporate securities | Financial bills    
Disclosure of financial assets [line items]    
Total 37,341 33,062
Fair value adjustment 4 9
Fair value 37,345 33,071
Financial assets at fair value through profit or loss, classified as held for trading, category | Corporate securities | Promissory and commercial notes    
Disclosure of financial assets [line items]    
Total 1,177 1,214
Fair value adjustment (3) 2
Fair value 1,174 1,216
Financial assets at fair value through profit or loss, classified as held for trading, category | Corporate securities | Other    
Disclosure of financial assets [line items]    
Total 2,052 2,574
Fair value adjustment 10 253
Fair value 2,062 2,827
Financial assets at fair value through profit or loss, classified as held for trading, category | Shares    
Disclosure of financial assets [line items]    
Total 24,824 27,860
Fair value adjustment 351 (1,980)
Fair value 25,175 25,880
Financial assets at fair value through profit or loss, classified as held for trading, category | Investment funds    
Disclosure of financial assets [line items]    
Total 39,940 37,642
Fair value adjustment (95) (539)
Fair value 39,845 37,103
Financial assets at fair value through profit or loss, classified as held for trading, category | Government securities (Designated at FVPL)    
Disclosure of financial assets [line items]    
Total 15,471 313
Fair value adjustment 34 5
Fair value 15,505 318
Financial assets at fair value through profit or loss, classified as held for trading, category | Financial Assets At Fair Value Through Profit Or Loss, Including Government Securities    
Disclosure of financial assets [line items]    
Total 631,030 572,153
Fair value adjustment (2,256) (12,010)
Fair value R$ 628,774 R$ 560,143