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Fair value of financial assets and liabilities (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss, mandatorily measured at fair value R$ 262,407,149 R$ 231,001,886
Debt instruments 95,546,026 107,585,055
Equity instruments 4,862,393 2,968,823
Derivatives 65,590,206 40,175,818
Loans and advances to customers 6,413,587 4,911,803
Reserves at the Central Bank of Brazil 89,994,937 75,360,387
Financial Assets Measured At Fair Value Through Profit Or Loss Held For Trading 69,446,583 92,078,540
Comprehensive Income Debt instruments 69,354,220 92,058,907
Comprehensive Income Equity instruments 92,363 19,633
Hedging derivatives (assets) 217,492 30,481
Financial Liabilities Measured At Fair Value Through Profit Or Loss 112,471,311 82,722,610
Derivatives 59,827,986 39,280,448
Short positions 49,380,059 39,396,666
Bonds and securities obligations 3,263,266 4,045,496
Hedging derivatives (liabilities) 184,005 129,826
Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss, mandatorily measured at fair value 84,368,028 90,905,041
Debt instruments 79,505,635 88,260,075
Equity instruments 4,862,393 2,644,966
Financial Assets Measured At Fair Value Through Profit Or Loss Held For Trading 65,444,645 88,640,516
Comprehensive Income Debt instruments 65,444,625 88,620,903
Comprehensive Income Equity instruments 20 19,613
Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss, mandatorily measured at fair value 174,725,164 132,973,627
Debt instruments 14,889,571 15,624,289
Equity instruments 296,834
Derivatives 64,266,589 39,468,524
Loans and advances to customers 5,574,067 2,223,593
Reserves at the Central Bank of Brazil 89,994,937 75,360,387
Hedging derivatives (assets) 217,492 30,481
Financial Liabilities Measured At Fair Value Through Profit Or Loss 110,545,164 82,213,242
Derivatives 57,901,839 38,771,080
Short positions 49,380,059 39,396,666
Bonds and securities obligations 3,263,266 4,045,496
Hedging derivatives (liabilities) 184,005 129,826
Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss, mandatorily measured at fair value 3,313,957 7,123,218
Debt instruments 1,150,820 3,700,691
Equity instruments 27,023
Derivatives 1,323,617 707,294
Loans and advances to customers 839,520 2,688,210
Financial Assets Measured At Fair Value Through Profit Or Loss Held For Trading 4,001,938 3,438,024
Comprehensive Income Debt instruments 3,909,595 3,438,004
Comprehensive Income Equity instruments 92,343 20
Financial Liabilities Measured At Fair Value Through Profit Or Loss 1,926,147 509,368
Derivatives R$ 1,926,147 R$ 509,368