v3.26.1
Insurance contracts and private pension - Narrative (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Assets R$ 3,066,169 R$ 2,854,475 R$ 2,543,100
Liabilities 2,851,093 2,633,191 R$ 2,344,050
Fair value investment funds 335,480 287,919  
Revenue from insurance 1,794 2,241  
Revenue from private pension 18,087 17,798  
General Model B B A      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Assets 188 46  
Liabilities R$ 6,085 R$ 5,798