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Management of financial risks and financial instruments - Summary of financial liabilities into groupings based on their contractual maturities (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Financial Liabilities At Fair Value Through Profit Or Loss Securities Loaned R$ 21,043,459 R$ 15,253,376
Derivative financial liabilities 37,546,940 40,047,687
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements 58,713,869 71,779,721
Financial Liabilities At Amortized Cost Securities Trading And Intermediation 22,420,806 18,474,978
Financial Liabilities At Amortized Cost, Financial Instruments Payable 123,403,515 95,248,482
Financial Liabilities At Amortized Cost Borrowings 237,894 1,666,432
Financial Liabilities At Amortized Cost Accounts Payables 810,157 763,465
Financial Liabilities At Amortized Cost Other Financial Liabilities 12,320,730 14,730,863
Financial liabilities 276,497,370 257,965,004
Not later than one month [member]    
Disclosure of financial assets [line items]    
Financial Liabilities At Fair Value Through Profit Or Loss Securities Loaned 20,388,644 14,830,405
Derivative financial liabilities 3,464,532 7,176,746
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements 33,233,998 71,779,721
Financial Liabilities At Amortized Cost Securities Trading And Intermediation 22,420,806 18,474,978
Financial Liabilities At Amortized Cost, Financial Instruments Payable 11,864,505 6,140,457
Financial Liabilities At Amortized Cost Borrowings 0 0
Financial Liabilities At Amortized Cost Accounts Payables 691,171 763,465
Financial Liabilities At Amortized Cost Other Financial Liabilities 7,105,929 9,124,704
Financial liabilities 99,169,585 128,290,476
Later than one month and not later than three months [member]    
Disclosure of financial assets [line items]    
Financial Liabilities At Fair Value Through Profit Or Loss Securities Loaned 0 0
Derivative financial liabilities 808,169 3,336,329
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements 19,669,809 0
Financial Liabilities At Amortized Cost Securities Trading And Intermediation 0 0
Financial Liabilities At Amortized Cost, Financial Instruments Payable 11,833,502 16,786,357
Financial Liabilities At Amortized Cost Borrowings 0 0
Financial Liabilities At Amortized Cost Accounts Payables 66,554 0
Financial Liabilities At Amortized Cost Other Financial Liabilities 887,012 1,560,439
Financial liabilities 33,265,046 21,683,125
Later than three months and not later than one year [member]    
Disclosure of financial assets [line items]    
Financial Liabilities At Fair Value Through Profit Or Loss Securities Loaned 0 0
Derivative financial liabilities 9,905,322 10,134,377
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements 5,793,351 0
Financial Liabilities At Amortized Cost Securities Trading And Intermediation 0 0
Financial Liabilities At Amortized Cost, Financial Instruments Payable 55,855,849 29,109,323
Financial Liabilities At Amortized Cost Borrowings 237,894 1,666,432
Financial Liabilities At Amortized Cost Accounts Payables 52,432 0
Financial Liabilities At Amortized Cost Other Financial Liabilities 3,991,554 3,584,285
Financial liabilities 75,836,402 44,494,417
Later than one year and not later than five years [member]    
Disclosure of financial assets [line items]    
Financial Liabilities At Fair Value Through Profit Or Loss Securities Loaned 0 0
Derivative financial liabilities 18,347,974 11,738,481
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements 0 0
Financial Liabilities At Amortized Cost Securities Trading And Intermediation 0 0
Financial Liabilities At Amortized Cost, Financial Instruments Payable 38,232,718 37,796,433
Financial Liabilities At Amortized Cost Borrowings 0 0
Financial Liabilities At Amortized Cost Accounts Payables 0 0
Financial Liabilities At Amortized Cost Other Financial Liabilities 336,235 461,435
Financial liabilities 56,916,927 49,996,349
Later than five years [member]    
Disclosure of financial assets [line items]    
Financial Liabilities At Fair Value Through Profit Or Loss Securities Loaned 654,815 422,971
Derivative financial liabilities 5,020,943 7,661,754
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements 16,711 0
Financial Liabilities At Amortized Cost Securities Trading And Intermediation 0 0
Financial Liabilities At Amortized Cost, Financial Instruments Payable 5,616,941 5,415,912
Financial Liabilities At Amortized Cost Borrowings 0 0
Financial Liabilities At Amortized Cost Accounts Payables 0 0
Financial Liabilities At Amortized Cost Other Financial Liabilities 0 0
Financial liabilities R$ 11,309,410 R$ 13,500,637