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Risk management (Details 5) - BRL (R$)
R$ in Millions
Dec. 31, 2025
Dec. 31, 2024
IfrsStatementLineItems [Line Items]    
Demand deposits R$ 29,994 R$ 40,398
Demand deposits Percentage 100.00% 100.00%
Savings accounts R$ 52,989 R$ 57,369
Savings accounts Percentage 100.00% 100.00%
Time deposits R$ 414,479 R$ 403,686
Time deposits Percentage 29.00% 26.00%
Interbank deposit R$ 6,022 R$ 5,850
Interbank deposit percentage 20.00% 18.00%
Funds from acceptances and issuance of securities R$ 177,693 R$ 151,686
Funds from acceptances and issuance of securities percentage 6.00% 7.00%
Borrowings and Onlendings R$ 109,594 R$ 105,768
Borrowings and Onlendings percentage 12.00% 9.00%
Subordinated Debts / Debt Instruments Eligible to Compose Capital R$ 28,305 R$ 23,125
Subordinated Debts / Debt Instruments Eligible to Compose Capital percentage
Total R$ 819,076 R$ 787,882
Total percentage 28.00% 28.00%
Customers Funding 0 Days 30 [Member]    
IfrsStatementLineItems [Line Items]    
Demand deposits R$ 29,994 R$ 40,398
Savings accounts 52,989 57,369
Time deposits 118,994 103,569
Interbank deposit 1,207 1,058
Funds from acceptances and issuance of securities 11,414 11,237
Borrowings and Onlendings 13,175 9,959
Subordinated Debts / Debt Instruments Eligible to Compose Capital
Total R$ 227,773 R$ 223,590