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Derivative financial instruments - Summary of derivative financial instruments portfolio (assets and liabilities) by type of instrument (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount R$ 3,579,124,453 R$ 1,337,200,771
Assets, fair value R$ 23,733,466 R$ 9,217,155
Percentage of derivative financial assets 10000.00% 10000.00%
Liabilities, notional amount R$ 3,105,052,651 R$ 1,019,527,567
Liabilities, fair value R$ 24,785,416 R$ 8,605,409
Percentage of derivative financial liabilities 10000.00% 10000.00%
Options    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount R$ 2,308,283,883 R$ 852,098,826
Liabilities, fair value R$ 17,970,099 R$ 7,086,946
Percentage of derivative financial liabilities 7400.00% 8400.00%
Swap contracts    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount R$ 403,391,373 R$ 140,039,765
Liabilities, fair value R$ 3,448,067 R$ 161,574
Percentage of derivative financial liabilities 1300.00% 1400.00%
Forward contracts    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount R$ 82,074,317 R$ 13,755,838
Liabilities, fair value R$ 2,705,166 R$ 839,421
Percentage of derivative financial liabilities 300.00% 100.00%
Future contracts    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount R$ 311,303,078 R$ 13,548,954
Liabilities, fair value R$ 662,084 R$ 511,167
Percentage of derivative financial liabilities 1000.00% 100.00%
Others    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount   R$ 84,184
Liabilities, fair value   R$ 6,301
Percentage of derivative financial liabilities   0.00%
Options    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount R$ 3,053,641,595 R$ 34,679,065
Assets, fair value R$ 15,982,949 R$ 296,249
Percentage of derivative financial assets 8500.00% 300.00%
Swap contracts    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount R$ 392,133,687 R$ 1,253,758,408
Assets, fair value R$ 3,883,112 R$ 5,542,340
Percentage of derivative financial assets 1100.00% 9400.00%
Forward contracts    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount R$ 125,343,466 R$ 32,705,136
Assets, fair value R$ 2,889,964 R$ 2,828,613
Percentage of derivative financial assets 300.00% 200.00%
Future contracts    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount R$ 8,005,705 R$ 16,058,162
Assets, fair value R$ 977,441 R$ 549,953
Percentage of derivative financial assets 100.00% 100.00%
Up to 3 months    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value R$ 9,963,173 R$ 1,698,436
Liabilities, fair value 8,300,317 1,642,355
Up to 3 months | Options    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 5,996,813 1,387,988
Up to 3 months | Swap contracts    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 56,590 53,421
Up to 3 months | Forward contracts    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 2,216,996 44,526
Up to 3 months | Future contracts    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 29,918 150,119
Up to 3 months | Others    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value   6,301
Up to 3 months | Options    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 6,240,115 73,621
Up to 3 months | Swap contracts    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 381,744 1,209,290
Up to 3 months | Forward contracts    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 2,508,142 62,729
Up to 3 months | Future contracts    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 833,172 352,796
From 4 to 12 months    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 7,342,323 2,636,377
Liabilities, fair value 6,773,980 2,340,407
From 4 to 12 months | Options    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 5,601,569 1,781,457
From 4 to 12 months | Swap contracts    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 842,922 72,349
From 4 to 12 months | Forward contracts    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 250,030 261,669
From 4 to 12 months | Future contracts    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 79,459 224,932
From 4 to 12 months | Others    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value   0
From 4 to 12 months | Options    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 6,455,786 222,628
From 4 to 12 months | Swap contracts    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 531,023 1,931,618
From 4 to 12 months | Forward contracts    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 250,756 350,012
From 4 to 12 months | Future contracts    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 104,758 132,119
Above 12 months    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 6,427,970 4,882,342
Liabilities, fair value 9,711,119 4,622,647
Above 12 months | Options    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 6,371,717 3,917,501
Above 12 months | Swap contracts    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 2,548,555 35,804
Above 12 months | Forward contracts    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 238,140 533,226
Above 12 months | Future contracts    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 552,707 136,116
Above 12 months | Others    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value   0
Above 12 months | Options    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 3,287,048 0
Above 12 months | Swap contracts    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 2,970,345 2,401,432
Above 12 months | Forward contracts    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 131,066 2,415,872
Above 12 months | Future contracts    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value R$ 39,511 R$ 65,038