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Derivative financial instruments - Summary of derivative financial instruments by index (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 40,920,581 46,199,796
Liabilities, notional amount 4,234,998,602 3,692,719,383
Liabilities, fair value (37,546,940) (40,047,687)
Net, fair value 3,373,641 6,152,109
Swap contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 862,383,442 825,780,642
Liabilities, fair value (14,937,416) (14,000,255)
Swap contract [member] | Interest [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 789,512,985 762,360,740
Liabilities, fair value (12,134,315) (7,667,588)
Swap contract [member] | Foreign exchange [Domain]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 34,241,157 48,091,014
Liabilities, fair value (1,574,705) (2,332,909)
Swap contract [member] | Shares [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 36,676,560 13,399,986
Liabilities, fair value (1,180,195) (3,795,336)
Swap contract [member] | Commodities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 1,952,740 1,928,902
Liabilities, fair value (48,201) (204,422)
Forward contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 144,316,614 28,290,772
Liabilities, fair value (1,681,224) (2,083,292)
Forward contract [member] | Interest [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 1,759,346 10,619,439
Liabilities, fair value (1,284,289) (458,560)
Forward contract [member] | Foreign exchange [Domain]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 136,860,587 17,671,333
Liabilities, fair value (309,570) (1,624,732)
Forward contract [member] | Shares [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 1,074,951 0
Liabilities, fair value (14,413) 0
Forward contract [member] | Commodities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 4,621,730 0
Liabilities, fair value (72,952) 0
Future contracts [Member] | Interest [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 259,471,046 91,070,059
Liabilities, fair value (3,597,542) (451,014)
Future contracts [Member] | Foreign exchange [Domain]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 16,866,362 17,679,727
Liabilities, fair value (50,492) (50,786)
Future contracts [Member] | Shares [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 47,031 201,459,785
Liabilities, fair value (150) (997,705)
Future contracts [Member] | Commodities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 28,191,142 86,833,282
Liabilities, fair value (15,874) (430,031)
Option contracts [Member] | Interest [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 2,586,274,296 2,440,966,741
Liabilities, fair value (932,898) (15,167,264)
Option contracts [Member] | Foreign exchange [Domain]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 74,802,937 175,548
Liabilities, fair value (4,438,639) (526,549)
Option contracts [Member] | Shares [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 62,136,485 459,335
Liabilities, fair value (11,388,211) (6,340,766)
Option contracts [Member] | Commodities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, notional amount 200,509,247 3,492
Liabilities, fair value (504,494) (25)
Swap contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 914,003,115 758,053,043
Assets, fair value 20,361,017 21,743,021
Swap contract [member] | Interest [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 60,549,711 48,173,431
Assets, fair value 3,583,555 2,336,907
Swap contract [member] | Foreign exchange [Domain]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 821,149,048 708,886,668
Assets, fair value 14,657,464 19,137,399
Swap contract [member] | Shares [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 30,060,006 922,307
Assets, fair value 2,024,883 261,229
Swap contract [member] | Commodities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 2,244,350 70,637
Assets, fair value 95,115 7,486
Forward contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 131,460,114 24,701,643
Assets, fair value 1,071,790 2,692,354
Forward contract [member] | Interest [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 124,996,692 14,082,204
Assets, fair value 420,217 2,233,794
Forward contract [member] | Foreign exchange [Domain]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 681,240 0
Assets, fair value 581,240 0
Forward contract [member] | Shares [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 990,579 10,619,439
Assets, fair value 9,674 458,560
Forward contract [member] | Commodities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 4,791,603 0
Assets, fair value 60,659 0
Futures contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 209,334,260 22,759,253
Assets, fair value 5,966,802 3,003,675
Futures contract [member] | Interest [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 22,610,678 433,824
Assets, fair value 171,319 1,264
Futures contract [member] | Foreign exchange [Domain]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 167,526,834 9,856,454
Assets, fair value 5,786,166 1,456,514
Futures contract [member] | Shares [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 384,832 4,011,021
Assets, fair value 662 545,439
Futures contract [member] | Commodities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 18,811,916 8,457,954
Assets, fair value 8,655 1,000,458
Option contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 3,055,103,887 2,538,687,746
Assets, fair value 13,520,972 18,760,746
Option contract [member] | Interest [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 72,853,018 9,565,942
Assets, fair value 3,315,588 714,593
Option contract [member] | Foreign exchange [Domain]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 2,831,484,361 2,528,806,657
Assets, fair value 3,165,811 17,978,224
Option contract [member] | Shares [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 130,174,446 313,605
Assets, fair value 6,729,047 67,766
Option contract [member] | Commodities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, notional amount 20,592,062 1,542
Assets, fair value R$ 310,526 R$ 163