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Risk management (Details 3) - 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$ 940 | R$ 1,404
Income debt instruments | 940 | 1,404
Financial assets measured at fair value in profit or loss for trading | 152,373 | 123,530
Profit or loss debt instruments | 97,556 | 89,871
Profit or loss equity instruments | 116 | 40
Profit or loss derivatives | 54,701 | 33,619
Financial assets not intended for trading Mandatory measured at the fair value of the result | 173 | 209
Fair value of the result debt instruments | 173 | 209
Financial assets measured at fair value in other comprehensive income | 74,554 | 103,367
Comprehensive income debt instruments | 74,554 | 103,367
Financial Assets Measured at Amortized Cost | 718,516 | 679,164
Loans and Other Amounts with Credit institutions | 101,830 | 118,553
Loans and advances to customers | 505,323 | 493,892
Amortized cost debt instruments | 111,363 | 66,719
Amortized cost total | 946,555 | 907,465
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 | 846,665 | 815,953
Deposits from the Central Bank of Brazil and deposits from credit institutions | 123,399 | 123,044
Customer deposits | 518,151 | 518,965
Bonds and securities | 176,783 | 150,602
Debt Instruments Eligible to Capital | 28,332 | 23,342
Total | 931,315 | 867,546
Ranges 91to 365 Days [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 | 22,998 | 24,793
Profit or loss debt instruments | 18,943 | 19,038
Profit or loss derivatives | 4,055 | 5,755
Financial assets measured at fair value in other comprehensive income | 15,195 | 4,977
Comprehensive income debt instruments | 15,195 | 4,977
Financial Assets Measured at Amortized Cost | 161,223 | 153,954
Loans and Other Amounts with Credit institutions | 1,823 | 2,197
Loans and advances to customers | 133,145 | 138,836
Amortized cost debt instruments | 26,255 | 12,921
Amortized cost total | 199,544 | 183,845
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 | 235,321 | 249,441
Deposits from the Central Bank of Brazil and deposits from credit institutions | 66,223 | 68,882
Customer deposits | 112,578 | 124,584
Bonds and securities | 56,520 | 55,975
Debt Instruments Eligible to Capital |  |
Total | 236,735 | 251,399
One To Fiveyears [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 | 48,620 | 52,083
Profit or loss debt instruments | 32,994 | 35,033
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 | 18,318 | 59,238
Comprehensive income debt instruments | 18,318 | 59,238
Financial Assets Measured at Amortized Cost | 262,885 | 234,133
Loans and Other Amounts with Credit institutions | 1,045 | 3,910
Loans and advances to customers | 205,986 | 193,061
Amortized cost debt instruments | 55,854 | 37,162
Amortized cost total | 330,634 | 346,737
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 | 280,848 | 242,650
Deposits from the Central Bank of Brazil and deposits from credit institutions | 16,787 | 21,268
Customer deposits | 177,206 | 160,324
Bonds and securities | 86,855 | 61,058
Debt Instruments Eligible to Capital |  |
Total | 285,740 | 249,147
On demand [member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets measured at fair value in profit or loss for trading | 10,493 | 7,700
Profit or loss debt instruments | 10,493 | 7,700
Financial assets measured at fair value in other comprehensive income | 2,299 | 2,183
Comprehensive income debt instruments | 2,299 | 2,183
Financial Assets Measured at Amortized Cost | 99,986 | 113,264
Loans and Other Amounts with Credit institutions | 98,671 | 110,426
Loans and advances to customers | 735 | 2,557
Amortized cost debt instruments | 580 | 281
Amortized cost total | 112,778 | 123,147
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 | 170,248 | 174,985
Deposits from the Central Bank of Brazil and deposits from credit institutions | 447 | 508
Customer deposits | 169,801 | 174,477
Bonds and securities |  |
Debt Instruments Eligible to Capital |  |
Total | 219,663 | 214,388
Range 31to 90 Days [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets measured at fair value in profit or loss for trading | 45,929 | 6,779
Profit or loss debt instruments | 14,090 | 1,123
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 | 10,161 | 5,258
Comprehensive income debt instruments | 10,161 | 5,258
Financial Assets Measured at Amortized Cost | 104,415 | 107,139
Loans and Other Amounts with Credit institutions | 291 | 2,020
Loans and advances to customers | 102,261 | 98,218
Amortized cost debt instruments | 1,863 | 6,901
Amortized cost total | 160,505 | 119,176
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 | 129,579 | 116,741
Deposits from the Central Bank of Brazil and deposits from credit institutions | 39,764 | 32,060
Customer deposits | 58,543 | 59,547
Bonds and securities | 31,272 | 25,134
Debt Instruments Eligible to Capital |  |
Total | 157,630 | 119,270
Top Of Time Interval [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Financial assets measured at fair value in profit or loss for trading | 24,333 | 32,175
Profit or loss debt instruments | 21,036 | 26,977
Profit or loss derivatives | 3,297 | 5,198
Financial assets not intended for trading Mandatory measured at the fair value of the result | 173 | 209
Fair value of the result debt instruments | 173 | 209
Financial assets measured at fair value in other comprehensive income | 28,581 | 31,711
Comprehensive income debt instruments | 28,581 | 31,711
Financial Assets Measured at Amortized Cost | 90,007 | 70,674
Loans and advances to customers | 63,196 | 61,220
Amortized cost debt instruments | 26,811 | 9,454
Amortized cost total | 143,094 | 134,560
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 | 30,669 | 32,136
Deposits from the Central Bank of Brazil and deposits from credit institutions | 178 | 326
Customer deposits | 23 | 33
Bonds and securities | 2,136 | 8,435
Debt Instruments Eligible to Capital | 28,332 | 23,342
Total | R$ 31,547 | R$ 33,342

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