v3.26.1
Risk and Capital Management - Narrative (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about borrowings [line items]    
Derivatives, amount contributed to fair value of plan assets R$ 73,384 R$ 92,439
Total financial liability 4,720 5,036
Total assets repossessed R$ 732 794
VaR calculation confidence level percentage 99.00%  
VaR calculation period 4 years  
Value at risk R$ 1,128 R$ 1,743
Percentage of aggregate funds from customers available on demand 77.40%  
Funds from clients R$ 1,296,985  
Totaled average sovereign securities 389,723  
Net cash outflows totaled average 181,290  
Available stable funds 1,499,680  
Required stable funding R$ 1,202,060  
Total capital ratio (%) 15.20% 16.50%
Surplus capital in relation to the minimum referential equity required R$ 108,151 R$ 117,278
Additional Tier I capital, required 53,686 49,049
Increase decrease in referential equity 69,887 71,704
Referring to amounts 343,066 295,823
Unsecured Loans    
Disclosure of detailed information about borrowings [line items]    
Total financial liability 550,231 R$ 417,751
Credit risk    
Disclosure of detailed information about borrowings [line items]    
Percentage of reinsurance premiums operations   1.30%
Subordinated Debttier I Capital    
Disclosure of detailed information about borrowings [line items]    
Subordinated debt, Tier I capital 21,543 R$ 16,957
Subordinated Debttier II Capital    
Disclosure of detailed information about borrowings [line items]    
Subordinated debt, Tier II capital R$ 19,034 R$ 20,497
L C R    
Disclosure of detailed information about borrowings [line items]    
Percentage of financial assets 215.00% 221.30%
N S F R    
Disclosure of detailed information about borrowings [line items]    
Percentage of financial assets 124.80% 122.00%
Maximum    
Disclosure of detailed information about borrowings [line items]    
Value at risk R$ 1,744 R$ 1,902
Total capital ratio (%) 15.20%  
Percentage of adjusted capital ratio 50.00%  
Minimum    
Disclosure of detailed information about borrowings [line items]    
Value at risk R$ 777 R$ 756
Percentage of fixed assets ratio 19.40% 18.50%
Loan Commitments    
Disclosure of detailed information about borrowings [line items]    
Expected loss R$ 1,793 R$ 4,928
Optimistic scenario    
Disclosure of detailed information about borrowings [line items]    
Expected credit loss rate 100.00%  
Optimistic scenario | Brazil    
Disclosure of detailed information about borrowings [line items]    
Expected credit loss rate 10.00%  
Base scenario    
Disclosure of detailed information about borrowings [line items]    
Expected credit loss rate 100.00%  
Base scenario | Brazil    
Disclosure of detailed information about borrowings [line items]    
Expected credit loss rate 50.00%  
Pessimistic scenario    
Disclosure of detailed information about borrowings [line items]    
Expected credit loss rate 100.00%  
Pessimistic scenario | Brazil    
Disclosure of detailed information about borrowings [line items]    
Expected credit loss rate 40.00%