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Hedge accounting - Hedged item maturity (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about hedged items [line items]      
Notional value R$ 20,967,989 R$ 18,563,230 R$ 9,738,021
0-1 year      
Disclosure of detailed information about hedged items [line items]      
Notional value 1,536,589 873,144 520,853
1-2 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 1,699,201 707,421 276,219
2-3 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 6,001,602 2,805,418 478,745
3-4 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 6,920,470 5,913,477 1,028,004
4-5 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 2,888,836 5,930,291 4,510,125
5-10 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 1,921,291 2,333,479 2,924,075
Hedge of fair value      
Disclosure of detailed information about hedged items [line items]      
Notional value 20,082,782 17,887,369 9,297,999
Hedge of fair value | 0-1 year      
Disclosure of detailed information about hedged items [line items]      
Notional value 696,906 229,368 136,636
Hedge of fair value | 1-2 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 1,653,677 707,421 276,219
Hedge of fair value | 2-3 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 6,001,602 2,773,333 478,745
Hedge of fair value | 3-4 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 6,920,470 5,913,477 972,199
Hedge of fair value | 4-5 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 2,888,836 5,930,291 4,510,125
Hedge of fair value | 5-10 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 1,921,291 2,333,479 2,924,075
Hedge of net investment in foreign operations      
Disclosure of detailed information about hedged items [line items]      
Notional value 446,442 414,043 440,022
Hedge of net investment in foreign operations | 0-1 year      
Disclosure of detailed information about hedged items [line items]      
Notional value 400,918 381,958 384,217
Hedge of net investment in foreign operations | 1-2 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 45,524 0 0
Hedge of net investment in foreign operations | 2-3 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 0 32,085 0
Hedge of net investment in foreign operations | 3-4 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 0 0 55,805
Hedge of net investment in foreign operations | 4-5 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 0 0 0
Hedge of net investment in foreign operations | 5-10 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 0 0 0
Hedge of cash flow      
Disclosure of detailed information about hedged items [line items]      
Notional value 438,765 261,818 R$ 0
Hedge of cash flow | 0-1 year      
Disclosure of detailed information about hedged items [line items]      
Notional value 438,765 261,818  
Hedge of cash flow | 1-2 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 0 0  
Hedge of cash flow | 2-3 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 0 0  
Hedge of cash flow | 3-4 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 0 0  
Hedge of cash flow | 4-5 years      
Disclosure of detailed information about hedged items [line items]      
Notional value 0 0  
Hedge of cash flow | 5-10 years      
Disclosure of detailed information about hedged items [line items]      
Notional value R$ 0 R$ 0