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Risk management (Details 6) - BRL (R$) R$ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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IfrsStatementLineItems [Line Items] |  |
Financial assets measured at fair value in income | R$ 939 | R$ 1,404
Income debt instruments | 939 | 1,404
Financial assets measured at fair value in profit or loss for trading | 193,289 | 159,210
Profit or loss debt instruments | 138,473 | 125,551
Profit or loss equity instruments | 115 | 40
Profit or loss derivatives | 54,701 | 33,619
Financial assets measured at fair value in other comprehensive income | 104,002 | 143,188
Comprehensive income debt instruments | 104,002 | 143,188
Comprehensive income equity instruments |  |
Financial Assets Measured at Amortized Cost | 837,230 | 819,017
Loans and Other Amounts with Credit Institutions | 101,737 | 119,011
Loans and advances to customers | 633,775 | 623,107
Amortized cost debt instruments | 101,718 | 76,899
Amortized cost total | 1,135,460 | 1,122,819
Financial Liabilities Measured at Fair Value in income Held for Trading | 84,650 | 51,593
Fair value in income held for trading derivatives | 35,270 | 12,196
Short Positions | 49,380 | 39,397
Financial liabilities at amortized cost | 1,096,159 | 1,043,065
Deposits from the Central Bank of Brazil and deposits from credit institutions | 128,747 | 131,052
Customer deposits | 662,511 | 66,117
Bonds and securities | 276,569 | 227,501
Debt Instruments Eligible to Capital | 28,332 | 23,342
Total | 1,180,809 | 1,094,658
Later than one month and not later than three months [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets measured at fair value in income |  |
Income debt instruments |  |
Financial assets measured at fair value in profit or loss for trading | 14,994 | 10,844
Profit or loss debt instruments | 14,994 | 10,844
Profit or loss equity instruments |  |
Profit or loss derivatives |  |
Financial assets measured at fair value in other comprehensive income | 3,199 | 2,931
Comprehensive income debt instruments | 3,199 | 2,931
Comprehensive income equity instruments |  |
Financial Assets Measured at Amortized Cost | 100,040 | 114,080
Loans and Other Amounts with Credit Institutions | 98,671 | 110,426
Loans and advances to customers | 1,366 | 3,373
Amortized cost debt instruments | 3 | 281
Amortized cost total | 118,233 | 127,855
Financial Liabilities Measured at Fair Value in income Held for Trading | 49,415 | 39,403
Fair value in income held for trading derivatives | 35 | 6
Short Positions | 49,380 | 39,397
Financial liabilities at amortized cost | 218,140 | 222,840
Deposits from the Central Bank of Brazil and deposits from credit institutions | 448 | 505
Customer deposits | 217,108 | 222,279
Bonds and securities | 584 | 56
Debt Instruments Eligible to Capital |  |
Total | 267,555 | 262,243
Later than three months and not later than six months [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets measured at fair value in income |  |
Income debt instruments |  |
Financial assets measured at fair value in profit or loss for trading | 51,830 | 7,206
Profit or loss debt instruments | 19,991 | 1,550
Profit or loss equity instruments | 36 | 17
Profit or loss derivatives | 31,803 | 5,639
Financial assets measured at fair value in other comprehensive income | 14,388 | 7,339
Comprehensive income debt instruments | 14,388 | 7,339
Comprehensive income equity instruments |  |
Financial Assets Measured at Amortized Cost | 133,537 | 163,232
Loans and Other Amounts with Credit Institutions | 270 | 2,535
Loans and advances to customers | 125,775 | 150,960
Amortized cost debt instruments | 7,492 | 9,737
Amortized cost total | 199,755 | 177,777
Financial Liabilities Measured at Fair Value in income Held for Trading | 28,051 | 2,529
Fair value in income held for trading derivatives | 28,051 | 2,529
Short Positions |  |
Financial liabilities at amortized cost | 134,803 | 130,959
Deposits from the Central Bank of Brazil and deposits from credit institutions | 39,510 | 32,408
Customer deposits | 74,854 | 75,866
Bonds and securities | 20,439 | 22,685
Debt Instruments Eligible to Capital |  |
Total | 162,854 | 133,488
Later than six months and not later than one year [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets measured at fair value in income | 128 | 121
Income debt instruments | 128 | 121
Financial assets measured at fair value in profit or loss for trading | 31,075 | 32,461
Profit or loss debt instruments | 27,020 | 26,706
Profit or loss equity instruments |  |
Profit or loss derivatives | 4,055 | 5,755
Financial assets measured at fair value in other comprehensive income | 20,046 | 6,576
Comprehensive income debt instruments | 20,046 | 6,576
Comprehensive income equity instruments |  |
Financial Assets Measured at Amortized Cost | 218,381 | 211,015
Loans and Other Amounts with Credit Institutions | 1,745 | 2,863
Loans and advances to customers | 192,447 | 181,405
Amortized cost debt instruments | 24,189 | 26,747
Amortized cost total | 269,630 | 250,173
Financial Liabilities Measured at Fair Value in income Held for Trading | 1,414 | 1,958
Fair value in income held for trading derivatives | 1,414 | 1,958
Short Positions |  |
Financial liabilities at amortized cost | 263,065 | 282,616
Deposits from the Central Bank of Brazil and deposits from credit institutions | 68,808 | 74,803
Customer deposits | 143,942 | 158,729
Bonds and securities | 50,315 | 49,084
Debt Instruments Eligible to Capital |  |
Total | 264,479 | 284,574
Later than one year and not later than five years [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets measured at fair value in income | 812 | 1,283
Income debt instruments | 812 | 1,283
Financial assets measured at fair value in profit or loss for trading | 62,476 | 66,004
Profit or loss debt instruments | 46,850 | 48,954
Profit or loss equity instruments | 80 | 23
Profit or loss derivatives | 15,546 | 17,027
Financial assets measured at fair value in other comprehensive income | 25,527 | 81,687
Comprehensive income debt instruments | 25,527 | 81,687
Comprehensive income equity instruments |  |
Financial Assets Measured at Amortized Cost | 265,159 | 223,938
Loans and Other Amounts with Credit Institutions | 1,051 | 3,187
Loans and advances to customers | 227,364 | 198,944
Amortized cost debt instruments | 36,744 | 21,807
Amortized cost total | 353,974 | 372,912
Financial Liabilities Measured at Fair Value in income Held for Trading | 4,892 | 6,497
Fair value in income held for trading derivatives | 4,892 | 6,497
Short Positions |  |
Financial liabilities at amortized cost | 373,958 | 325,846
Deposits from the Central Bank of Brazil and deposits from credit institutions | 18,894 | 22,099
Customer deposits | 226,577 | 204,254
Bonds and securities | 128,487 | 99,493
Debt Instruments Eligible to Capital |  |
Total | 378,850 | 332,343
Above 5 Years [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets measured at fair value in income |  |
Income debt instruments |  |
Financial assets measured at fair value in profit or loss for trading | 32,914 | 42,695
Profit or loss debt instruments | 29,617 | 37,497
Profit or loss equity instruments |  |
Profit or loss derivatives | 3,297 | 5,198
Financial assets measured at fair value in other comprehensive income | 40,841 | 44,655
Comprehensive income debt instruments | 40,841 | 44,655
Comprehensive income equity instruments |  |
Financial Assets Measured at Amortized Cost | 120,112 | 106,752
Loans and Other Amounts with Credit Institutions |  |
Loans and advances to customers | 86,822 | 88,425
Amortized cost debt instruments | 33,290 | 18,327
Amortized cost total | 193,867 | 194,102
Financial Liabilities Measured at Fair Value in income Held for Trading | 878 | 1,206
Fair value in income held for trading derivatives | 878 | 1,206
Short Positions |  |
Financial liabilities at amortized cost | 106,193 | 80,804
Deposits from the Central Bank of Brazil and deposits from credit institutions | 1,087 | 1,237
Customer deposits | 30 | 42
Bonds and securities | 76,744 | 56,183
Debt Instruments Eligible to Capital | 28,332 | 23,342
Total | R$ 107,071 | R$ 82,010

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