v3.26.1
Hedge accounting - Schedule of Hedge Instruments and Book Value of Hedged Item (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of risk management strategy related to hedge accounting [line items]      
Variation in value recognized in other comprehensive income R$ 1,002 R$ (2,156) R$ 684
Notional amount 414,431 356,851  
Hedge of asset-backed securities under repurchase agreements      
Disclosure of risk management strategy related to hedge accounting [line items]      
Notional amount 29,033 19,363  
Cash flow hedge      
Disclosure of risk management strategy related to hedge accounting [line items]      
Assets 121,661 120,012  
Liabilities 119,142 122,919  
Variation in value recognized in other comprehensive income (332) (1,122)  
Cash flow hedge reserve (558) (1,069)  
Notional amount 240,699 236,045  
Variation in fair value used to calculate hedge ineffectiveness (332) (1,066)  
Cash flow hedge | Hedge of assets transactions      
Disclosure of risk management strategy related to hedge accounting [line items]      
Notional amount 2,609 1,966  
Cash flow hedge | Hedge of asset-backed securities under repurchase agreements      
Disclosure of risk management strategy related to hedge accounting [line items]      
Notional amount 14,039 63,261  
Cash flow hedge | Hedge of assets denominated in Chilean unit of account      
Disclosure of risk management strategy related to hedge accounting [line items]      
Notional amount 83,462 39,894  
Cash flow hedge | Hedge of loan operations      
Disclosure of risk management strategy related to hedge accounting [line items]      
Notional amount 20,950 10,910  
Cash flow hedge | Hedge of deposits and repurchase agreements      
Disclosure of risk management strategy related to hedge accounting [line items]      
Notional amount 85,676 107,677  
Cash flow hedge | Hedge of funding      
Disclosure of risk management strategy related to hedge accounting [line items]      
Notional amount 32,753 10,900  
Cash flow hedge | Hedge of highly probable forecast transactions      
Disclosure of risk management strategy related to hedge accounting [line items]      
Notional amount 1,210 1,437  
Interest rate risk | Cash flow hedge | Hedge of assets transactions      
Disclosure of risk management strategy related to hedge accounting [line items]      
Assets 2,590 2,420  
Liabilities 0 0  
Variation in value recognized in other comprehensive income 9 (155)  
Cash flow hedge reserve (5) (155)  
Notional amount 2,609 1,966  
Variation in fair value used to calculate hedge ineffectiveness 9 (155)  
Interest rate risk | Cash flow hedge | Hedge of asset-backed securities under repurchase agreements      
Disclosure of risk management strategy related to hedge accounting [line items]      
Assets 14,459 66,795  
Liabilities 0 0  
Variation in value recognized in other comprehensive income (186) (3,428)  
Cash flow hedge reserve (875) (3,429)  
Notional amount 14,039 63,261  
Variation in fair value used to calculate hedge ineffectiveness (187) (3,428)  
Interest rate risk | Cash flow hedge | Hedge of assets denominated in Chilean unit of account      
Disclosure of risk management strategy related to hedge accounting [line items]      
Assets 83,462 39,842  
Liabilities 0 0  
Variation in value recognized in other comprehensive income 57 (54)  
Cash flow hedge reserve 56 (54)  
Notional amount 83,462 39,894  
Variation in fair value used to calculate hedge ineffectiveness 57 (54)  
Interest rate risk | Cash flow hedge | Hedge of loan operations      
Disclosure of risk management strategy related to hedge accounting [line items]      
Assets 20,950 10,955  
Liabilities 0 0  
Variation in value recognized in other comprehensive income 54 44  
Cash flow hedge reserve 106 59  
Notional amount 20,950 10,910  
Variation in fair value used to calculate hedge ineffectiveness 55 44  
Interest rate risk | Cash flow hedge | Hedge of deposits and repurchase agreements      
Disclosure of risk management strategy related to hedge accounting [line items]      
Assets 0 0  
Liabilities 85,403 110,405  
Variation in value recognized in other comprehensive income (273) 2,672  
Cash flow hedge reserve (8) 2,672  
Notional amount 85,676 107,677  
Variation in fair value used to calculate hedge ineffectiveness (273) 2,728  
Interest rate risk | Cash flow hedge | Hedge of funding      
Disclosure of risk management strategy related to hedge accounting [line items]      
Assets 0 0  
Liabilities 30,935 9,732  
Variation in value recognized in other comprehensive income (41) 3  
Cash flow hedge reserve (65) (61)  
Notional amount 30,935 9,735  
Variation in fair value used to calculate hedge ineffectiveness (41) 3  
Foreign exchange risk | Cash flow hedge | Hedge of funding      
Disclosure of risk management strategy related to hedge accounting [line items]      
Assets 0 0  
Liabilities 1,818 1,176  
Variation in value recognized in other comprehensive income 28 (11)  
Cash flow hedge reserve 28 (11)  
Notional amount 1,818 1,165  
Variation in fair value used to calculate hedge ineffectiveness 28 (11)  
Foreign exchange risk | Cash flow hedge | Hedge of highly probable forecast transactions      
Disclosure of risk management strategy related to hedge accounting [line items]      
Assets 200 0  
Liabilities 986 1,606  
Variation in value recognized in other comprehensive income 20 (193)  
Cash flow hedge reserve 205 (90)  
Notional amount 1,210 1,437  
Variation in fair value used to calculate hedge ineffectiveness R$ 20 R$ (193)