v3.25.4
Report of Directors Financial Review Risk Report - Management judgemental adjustments to ECL (Details) - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Annual change in management judgmental adjustments $ 0.1  
Allowance for ECL    
Disclosure of financial assets [line items]    
ECL income statement change for the period 4.9 $ 4.8
Allowance for ECL | Modelled ECL (A)    
Disclosure of financial assets [line items]    
ECL income statement change for the period 4.6 4.6
Allowance for ECL | Banks, sovereigns, government entities and low-risk counterparties    
Disclosure of financial assets [line items]    
ECL income statement change for the period   (0.0)
Allowance for ECL | Corporate lending adjustments    
Disclosure of financial assets [line items]    
ECL income statement change for the period 0.1 0.1
Allowance for ECL | Other credit judgements    
Disclosure of financial assets [line items]    
ECL income statement change for the period 0.1 (0.0)
Allowance for ECL | Total management judgemental adjustments (B)    
Disclosure of financial assets [line items]    
ECL income statement change for the period 0.2 0.1
Allowance for ECL | Other adjustments (C)    
Disclosure of financial assets [line items]    
ECL income statement change for the period 0.1 0.1
Allowance for ECL | Retail Lending    
Disclosure of financial assets [line items]    
ECL income statement change for the period 2.9 2.6
Allowance for ECL | Retail Lending | Downside 2 scenario    
Disclosure of financial assets [line items]    
ECL income statement change for the period (0.9) (1.5)
Allowance for ECL | Retail Lending | Modelled ECL (A)    
Disclosure of financial assets [line items]    
ECL income statement change for the period 2.8 2.6
Allowance for ECL | Retail Lending | Other credit judgements    
Disclosure of financial assets [line items]    
ECL income statement change for the period 0.1 (0.0)
Allowance for ECL | Retail Lending | Total management judgemental adjustments (B)    
Disclosure of financial assets [line items]    
ECL income statement change for the period 0.1 (0.0)
Allowance for ECL | Retail Lending | Other adjustments (C)    
Disclosure of financial assets [line items]    
ECL income statement change for the period (0.0) (0.0)
Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
ECL income statement change for the period 2.0 2.2
Allowance for ECL | Wholesale | Downside 2 scenario    
Disclosure of financial assets [line items]    
ECL income statement change for the period (2.7) (4.3)
Allowance for ECL | Wholesale | Modelled ECL (A)    
Disclosure of financial assets [line items]    
ECL income statement change for the period 1.8 2.0
Allowance for ECL | Wholesale | Banks, sovereigns, government entities and low-risk counterparties    
Disclosure of financial assets [line items]    
ECL income statement change for the period   (0.0)
Allowance for ECL | Wholesale | Corporate lending adjustments    
Disclosure of financial assets [line items]    
ECL income statement change for the period 0.1 0.1
Allowance for ECL | Wholesale | Total management judgemental adjustments (B)    
Disclosure of financial assets [line items]    
ECL income statement change for the period 0.1 0.1
Allowance for ECL | Wholesale | Other adjustments (C)    
Disclosure of financial assets [line items]    
ECL income statement change for the period $ 0.1 $ 0.1