v3.25.2
Report of the directors financial review risk report - Management judgemental adjustments (Details)
$ in Billions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
economic_scenario
Dec. 31, 2024
USD ($)
Disclosure of financial assets [line items]    
ECL estimates, % weight assigned 100.00%  
Number of economic scenarios to calculate ECL | economic_scenario 4  
Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets $ 5.2 $ 4.8
Retail | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 2.8 2.6
Wholesale | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 2.4 2.2
Modelled ECL (A) | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 4.6 4.6
Modelled ECL (A) | Retail | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 2.7 2.6
Modelled ECL (A) | Wholesale | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 1.9 2.0
Banks, sovereigns, government entities and low-risk counterparties | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets (0.0) (0.0)
Banks, sovereigns, government entities and low-risk counterparties | Wholesale | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets (0.0) (0.0)
Corporate lending adjustments | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 0.2 0.1
Corporate lending adjustments | Wholesale | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 0.2 0.1
Other credit judgements | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 0.1 (0.0)
Other credit judgements | Retail | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 0.1 (0.0)
Total management judgemental adjustments (B) | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 0.3 0.1
Total management judgemental adjustments (B) | Retail | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 0.1 (0.0)
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 0.2 0.1
Other adjustments (C) | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 0.4 0.1
Other adjustments (C) | Retail | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets 0.1 (0.0)
Other adjustments (C) | Wholesale | Allowance for ECL    
Disclosure of financial assets [line items]    
Increase in financial assets $ 0.3 $ 0.1