v3.25.2
Report of the directors financial review risk report - Group ECL sensitivity results (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
100% consensus Central scenario    
Disclosure of financial assets [line items]    
Probability 75.00% 75.00%
100% consensus Central scenario | Maximum    
Disclosure of financial assets [line items]    
Probability 100.00% 100.00%
100% consensus Upside scenario    
Disclosure of financial assets [line items]    
Probability 10.00% 10.00%
100% consensus Upside scenario | Maximum    
Disclosure of financial assets [line items]    
Probability 100.00% 100.00%
100% consensus Downside scenario    
Disclosure of financial assets [line items]    
Probability 10.00% 10.00%
100% consensus Downside scenario | Maximum    
Disclosure of financial assets [line items]    
Probability 100.00% 100.00%
100% Downside 2 scenario    
Disclosure of financial assets [line items]    
Probability 5.00% 5.00%
100% Downside 2 scenario | Maximum    
Disclosure of financial assets [line items]    
Probability 100.00% 100.00%
Allowance for ECL    
Disclosure of financial assets [line items]    
Increase (decrease) in financial assets $ (5,200) $ (4,800)
Allowance for ECL | Retail    
Disclosure of financial assets [line items]    
Financial assets 2,613 2,413
Increase (decrease) in financial assets (2,800) (2,600)
Decrease in allowance for ECL 200  
Allowance for ECL | Retail | 100% consensus Central scenario    
Disclosure of financial assets [line items]    
Financial assets 2,539 2,351
Allowance for ECL | Retail | 100% consensus Central scenario | Maximum    
Disclosure of financial assets [line items]    
Increase (decrease) in financial assets (100) (100)
Allowance for ECL | Retail | 100% consensus Upside scenario    
Disclosure of financial assets [line items]    
Financial assets 2,452 2,285
Allowance for ECL | Retail | 100% consensus Upside scenario | Maximum    
Disclosure of financial assets [line items]    
Increase (decrease) in financial assets (200) (100)
Allowance for ECL | Retail | 100% consensus Downside scenario    
Disclosure of financial assets [line items]    
Financial assets 2,662 2,440
Allowance for ECL | Retail | 100% consensus Downside scenario | Maximum    
Disclosure of financial assets [line items]    
Increase (decrease) in financial assets 0 0
Allowance for ECL | Retail | 100% Downside 2 scenario    
Disclosure of financial assets [line items]    
Financial assets 3,567 3,928
Allowance for ECL | Retail | 100% Downside 2 scenario | Maximum    
Disclosure of financial assets [line items]    
Increase (decrease) in financial assets 1,000 1,500
Allowance for ECL | Wholesale    
Disclosure of financial assets [line items]    
Financial assets 2,423 2,205
Increase (decrease) in financial assets (2,400) (2,200)
Decrease in allowance for ECL 200  
Allowance for ECL | Wholesale | 100% consensus Central scenario    
Disclosure of financial assets [line items]    
Financial assets 2,202 2,031
Allowance for ECL | Wholesale | 100% consensus Central scenario | Maximum    
Disclosure of financial assets [line items]    
Increase (decrease) in financial assets (100) (200)
Allowance for ECL | Wholesale | 100% consensus Upside scenario    
Disclosure of financial assets [line items]    
Financial assets 1,808 1,612
Allowance for ECL | Wholesale | 100% consensus Upside scenario | Maximum    
Disclosure of financial assets [line items]    
Increase (decrease) in financial assets (500) (600)
Allowance for ECL | Wholesale | 100% consensus Downside scenario    
Disclosure of financial assets [line items]    
Financial assets 3,091 2,877
Allowance for ECL | Wholesale | 100% consensus Downside scenario | Maximum    
Disclosure of financial assets [line items]    
Increase (decrease) in financial assets 800 700
Allowance for ECL | Wholesale | 100% Downside 2 scenario    
Disclosure of financial assets [line items]    
Financial assets 5,133 6,555
Allowance for ECL | Wholesale | 100% Downside 2 scenario | Maximum    
Disclosure of financial assets [line items]    
Increase (decrease) in financial assets $ 2,900 $ 4,300