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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, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount R$ 4,309,901,376 R$ 3,344,201,685
Assets, fair value R$ 40,920,581 R$ 46,199,796
Percentage of derivative financial assets 100.00% 100.00%
Liabilities, notional amount R$ 4,234,998,602 R$ 3,692,719,383
Liabilities, fair value R$ 37,546,940 R$ 40,047,687
Percentage of derivative financial liabilities 100.00% 100.00%
Option contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount R$ 2,923,722,965 R$ 2,441,605,116
Liabilities, fair value R$ 17,264,242 R$ 22,034,604
Percentage of derivative financial liabilities 46.00% 55.00%
Swap contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount R$ 862,383,442 R$ 825,780,642
Liabilities, fair value R$ 14,937,416 R$ 14,000,255
Percentage of derivative financial liabilities 40.00% 35.00%
Forward contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount R$ 144,316,614 R$ 28,290,772
Liabilities, fair value R$ 1,681,224 R$ 2,083,292
Percentage of derivative financial liabilities 4.00% 5.00%
Futures contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount R$ 304,575,581 R$ 397,042,853
Liabilities, fair value R$ 3,664,058 R$ 1,929,536
Percentage of derivative financial liabilities 10.00% 5.00%
Option contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount R$ 3,055,103,887 R$ 2,538,687,746
Assets, fair value R$ 13,520,972 R$ 18,760,746
Percentage of derivative financial assets 33.00% 41.00%
Swap contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount R$ 914,003,115 R$ 758,053,043
Assets, fair value R$ 20,361,017 R$ 21,743,021
Percentage of derivative financial assets 50.00% 47.00%
Forward contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount R$ 131,460,114 R$ 24,701,643
Assets, fair value R$ 1,071,790 R$ 2,692,354
Percentage of derivative financial assets 3.00% 6.00%
Futures contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount R$ 209,334,260 R$ 22,759,253
Assets, fair value R$ 5,966,802 R$ 3,003,675
Percentage of derivative financial assets 14.00% 6.00%
Not later than three months [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value R$ 7,490,899 R$ 9,815,756
Liabilities, fair value 4,272,701 10,513,075
Not later than three months [member] | Option contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 1,303,303 5,905,967
Not later than three months [member] | Swap contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 1,857,900 2,501,045
Not later than three months [member] | Forward contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 1,084,705 2,008,234
Not later than three months [member] | Futures contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 26,793 97,829
Not later than three months [member] | Option contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 2,631,248 5,326,134
Not later than three months [member] | Swap contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 3,906,979 2,296,009
Not later than three months [member] | Forward contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 937,529 2,058,810
Not later than three months [member] | Futures contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 15,143 134,803
Later Than Four Months And Not Later Than One Year [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 8,707,923 14,720,786
Liabilities, fair value 9,905,322 10,134,377
Later Than Four Months And Not Later Than One Year [Member] | Option contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 7,100,530 8,037,327
Later Than Four Months And Not Later Than One Year [Member] | Swap contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 1,393,812 1,106,887
Later Than Four Months And Not Later Than One Year [Member] | Forward contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 366,860 72,285
Later Than Four Months And Not Later Than One Year [Member] | Futures contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 1,044,120 917,878
Later Than Four Months And Not Later Than One Year [Member] | Option contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 6,012,043 12,239,761
Later Than Four Months And Not Later Than One Year [Member] | Swap contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 1,149,103 606,502
Later Than Four Months And Not Later Than One Year [Member] | Forward contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 14,282 605,517
Later Than Four Months And Not Later Than One Year [Member] | Futures contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 1,532,495 1,269,006
Later than one year and not later than five years [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 20,584,594 16,901,928
Liabilities, fair value 18,347,974 11,738,481
Later than one year and not later than five years [member] | Option contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 5,280,495 4,822,139
Later than one year and not later than five years [member] | Swap contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 10,515,355 6,082,330
Later than one year and not later than five years [member] | Forward contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 192,055 2,319
Later than one year and not later than five years [member] | Futures contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 2,360,069 831,693
Later than one year and not later than five years [member] | Option contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 4,877,594 1,194,830
Later than one year and not later than five years [member] | Swap contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 11,540,141 14,206,015
Later than one year and not later than five years [member] | Forward contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 57,942 13,535
Later than one year and not later than five years [member] | Futures contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 4,108,917 1,487,548
Later than five years [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 4,137,165 4,761,326
Liabilities, fair value 5,020,943 7,661,754
Later than five years [member] | Option contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 3,579,914 3,269,171
Later than five years [member] | Swap contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 1,170,349 4,309,993
Later than five years [member] | Forward contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 37,604 454
Later than five years [member] | Futures contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, fair value 233,076 82,136
Later than five years [member] | Option contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 87 21
Later than five years [member] | Swap contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 3,764,794 4,634,495
Later than five years [member] | Forward contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value 62,037 14,492
Later than five years [member] | Futures contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, fair value R$ 310,247 R$ 112,318