v3.26.1
Securities at fair value through other comprehensive income (FVOCI) - Schedule of Financial Assets Through Other Comprehensive Income - Securities By Maturity (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Current gross book value R$ 43,812 R$ 41,123
Non-current gross book value 91,896 70,341
Total gross book value 135,708 111,464
Current fair value 42,729 39,877
Non-current fair value 89,744 66,426
Total 132,473 106,303
Non-stated maturity    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Current gross book value 1,840 1,762
Current fair value 781 566
Up to one year    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Current gross book value 41,972 39,361
Current fair value 41,948 39,311
From one to five years    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Non-current gross book value 66,032 49,121
Non-current fair value 66,206 47,809
From five to ten years    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Non-current gross book value 15,687 11,201
Non-current fair value 15,154 10,803
After ten years    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Non-current gross book value 10,177 10,019
Non-current fair value R$ 8,384 R$ 7,814