v3.26.1
Securities at fair value through other comprehensive income (FVOCI) - Schedule of Reconciliation of Expected Loss for Financial Assets at Fair Value Through Other Comprehensive Instrument- Securities, Segregated by Stages (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of fair value measurement of assets [line items]    
Financial assets at beginning of period R$ 2,673,301  
Financial assets at end of period 2,880,511 R$ 2,673,301
Stage 1 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Financial assets at beginning of period (116) (117)
(Increase) / Reversal 98 (33)
Write-off 0 0
Financial assets at end of period (18) (116)
Stage 1 | Transfer to stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 55
Stage 1 | Transfer to stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 14 0
Stage 1 | Cure from stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets (14) (21)
Stage 1 | Cure from stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 0
Stage 1 | Government securities | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Financial assets at beginning of period (43) (38)
(Increase) / Reversal 40 (5)
Write-off 0 0
Financial assets at end of period (3) (43)
Stage 1 | Government securities | Transfer to stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 0
Stage 1 | Government securities | Transfer to stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 0
Stage 1 | Government securities | Cure from stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 0
Stage 1 | Corporate securities | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Financial assets at beginning of period (73) (79)
(Increase) / Reversal 58 (28)
Write-off 0 0
Financial assets at end of period (15) (73)
Stage 1 | Corporate securities | Transfer to stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 55
Stage 1 | Corporate securities | Transfer to stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 14 0
Stage 1 | Corporate securities | Cure from stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets (14) (21)
Stage 1 | Corporate securities | Cure from stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 0
Stage 2 | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Financial assets at beginning of period (127)  
Financial assets at end of period   (127)
Stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Financial assets at beginning of period (127) (24)
(Increase) / Reversal 0 (69)
Write-off 0 0
Financial assets at end of period 0 (127)
Stage 2 | Transfer to stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 14 21
Stage 2 | Transfer to stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 113 0
Stage 2 | Cure from stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 55
Stage 2 | Cure from stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 0
Stage 2 | Corporate securities | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Financial assets at beginning of period (127) (24)
(Increase) / Reversal 0 (69)
Write-off 0 0
Financial assets at end of period 0 (127)
Stage 2 | Corporate securities | Transfer to stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 14 21
Stage 2 | Corporate securities | Transfer to stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 113 0
Stage 2 | Corporate securities | Cure from stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 55
Stage 2 | Corporate securities | Cure from stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 0
Stage 3 | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Financial assets at beginning of period (14)  
Financial assets at end of period   (14)
Stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Financial assets at beginning of period (14) (26)
(Increase) / Reversal (321) 12
Write-off 0 0
Financial assets at end of period (462) (14)
Stage 3 | Transfer to stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 0
Stage 3 | Transfer to stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 0
Stage 3 | Cure from stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 14 0
Stage 3 | Cure from stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 113 0
Stage 3 | Corporate securities | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Financial assets at beginning of period (14) (26)
(Increase) / Reversal (321) 12
Write-off 0 0
Financial assets at end of period (462) (14)
Stage 3 | Corporate securities | Transfer to stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 0
Stage 3 | Corporate securities | Transfer to stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 0 0
Stage 3 | Corporate securities | Cure from stage 2 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets 14 0
Stage 3 | Corporate securities | Cure from stage 3 | Impairment | Financial assets measured at fair value through other comprehensive income    
Disclosure of fair value measurement of assets [line items]    
Increase (decrease) through transfers, financial assets R$ 113 R$ 0