v3.26.1
Report of the directors financial review risk report - Management judgemental adjustments (Details)
$ in Billions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
economicScenario
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Disclosure of financial assets [line items]      
ECL estimates, % weight assigned 100.00%    
Number of economic scenarios to calculate ECL | economicScenario 4    
Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets $ 5.0   $ 4.9
Retail | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 2.9   2.9
Wholesale | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 2.1   2.0
Modelled ECL (A) | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 4.7   4.6
Modelled ECL (A) | Retail | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 2.8   2.8
Modelled ECL (A) | Wholesale | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 1.9   1.8
Banks, sovereigns, government entities and low-risk counterparties | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets   (0.0)
Banks, sovereigns, government entities and low-risk counterparties | Wholesale | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets  
Corporate lending adjustments | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 0.1   0.1
Corporate lending adjustments | Wholesale | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 0.1   0.1
Other credit judgements | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 0.1   0.1
Other credit judgements | Retail | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 0.1   0.1
Total management judgemental adjustments (B) | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 0.2   0.2
Total management judgemental adjustments (B) | Retail | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 0.1   0.1
Total management judgemental adjustments (B) | Wholesale      
Disclosure of financial assets [line items]      
Increase in ECL   $ 0.1  
Total management judgemental adjustments (B) | Wholesale | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 0.1   0.1
Other adjustments (C) | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets 0.1   0.1
Other adjustments (C) | Retail | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets (0.0)   (0.0)
Other adjustments (C) | Wholesale | Allowance for ECL      
Disclosure of financial assets [line items]      
Increase in financial assets $ 0.1   $ 0.1