v3.26.1
Derivatives - Schedule of Credit derivatives (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross R$ 87,134 R$ 73,103
Brazilian government    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 74,760 59,799
Governments – abroad    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 470 411
Private entities    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 11,904 12,893
Investment grade    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 9,500 10,014
Below investment grade    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 77,634 63,089
Up to 1 year    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 52,386 42,500
Up to 1 year | Brazilian government    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 51,550 40,664
Up to 1 year | Governments – abroad    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 6 78
Up to 1 year | Private entities    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 830 1,758
Up to 1 year | Investment grade    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 299 1,222
Up to 1 year | Below investment grade    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 52,087 41,278
From 1 to 3 years    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 15,513 11,940
From 1 to 3 years | Brazilian government    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 11,757 8,678
From 1 to 3 years | Governments – abroad    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 225 141
From 1 to 3 years | Private entities    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 3,531 3,121
From 1 to 3 years | Investment grade    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 2,402 1,544
From 1 to 3 years | Below investment grade    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 13,111 10,396
From 3 to 5 years    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 16,210 18,192
From 3 to 5 years | Brazilian government    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 8,806 10,284
From 3 to 5 years | Governments – abroad    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 237 192
From 3 to 5 years | Private entities    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 7,167 7,716
From 3 to 5 years | Investment grade    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 6,675 7,153
From 3 to 5 years | Below investment grade    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 9,535 11,039
Over 5 years    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 3,025 471
Over 5 years | Brazilian government    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 2,647 173
Over 5 years | Governments – abroad    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 2 0
Over 5 years | Private entities    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 376 298
Over 5 years | Investment grade    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 124 95
Over 5 years | Below investment grade    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 2,901 376
CDS    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 34,561 37,066
CDS | Up to 1 year    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 1,482 6,463
CDS | From 1 to 3 years    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 13,844 11,940
CDS | From 3 to 5 years    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 16,210 18,192
CDS | Over 5 years    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 3,025 471
TRS    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 52,573 36,037
TRS | Up to 1 year    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 50,904 36,037
TRS | From 1 to 3 years    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 1,669 0
TRS | From 3 to 5 years    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross 0 0
TRS | Over 5 years    
Disclosure of detailed information about financial instruments [line items]    
Maximum potential of future payments, gross R$ 0 R$ 0