v3.26.1
Report of the directors financial review risk report - The consensus Upside scenario (Details) - Consensus Upside scenario allowance for ECL
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
UK | 2026    
Disclosure of financial assets [line items]    
GDP level (%, start-to-peak) 11.40% 11.00%
UK | 2027    
Disclosure of financial assets [line items]    
Unemployment rate (%, min) 3.50% 3.20%
House price index (%, start-to-peak) 17.50% 20.00%
Inflation rate (YoY % change, min) 1.90% 3.50%
Central bank policy rate (%, min) 3.80% 3.90%
US | 2026    
Disclosure of financial assets [line items]    
GDP level (%, start-to-peak) 15.30% 15.20%
US | 2027    
Disclosure of financial assets [line items]    
Unemployment rate (%, min) 3.60% 3.50%
House price index (%, start-to-peak) 23.30% 23.20%
Inflation rate (YoY % change, min) 1.00% 3.60%
Central bank policy rate (%, min) 3.60% 3.90%
Hong Kong | 2026    
Disclosure of financial assets [line items]    
GDP level (%, start-to-peak) 19.30% 20.70%
Hong Kong | 2027    
Disclosure of financial assets [line items]    
Unemployment rate (%, min) 2.80% 2.80%
House price index (%, start-to-peak) 30.40% 19.40%
Inflation rate (YoY % change, min) 0.40% 2.90%
Central bank policy rate (%, min) 3.90% 4.20%
Chinese mainland | 2026    
Disclosure of financial assets [line items]    
GDP level (%, start-to-peak) 29.60% 28.60%
Chinese mainland | 2027    
Disclosure of financial assets [line items]    
Unemployment rate (%, min) 4.70% 4.70%
House price index (%, start-to-peak) 12.50% 14.90%
Inflation rate (YoY % change, min) 0.00% 1.50%
Central bank policy rate (%, min) 2.90% 3.40%
France | 2026    
Disclosure of financial assets [line items]    
GDP level (%, start-to-peak) 8.10% 8.50%
France | 2027    
Disclosure of financial assets [line items]    
Unemployment rate (%, min) 6.90% 6.60%
House price index (%, start-to-peak) 19.50% 22.60%
Inflation rate (YoY % change, min) 0.60% 2.40%
Central bank policy rate (%, min) 2.30% 2.50%
UAE | 2026    
Disclosure of financial assets [line items]    
GDP level (%, start-to-peak) 40.40% 29.00%
UAE | 2027    
Disclosure of financial assets [line items]    
Unemployment rate (%, min) 1.80% 2.00%
House price index (%, start-to-peak) 18.30% 22.20%
Inflation rate (YoY % change, min) 1.40% 3.10%
Central bank policy rate (%, min) 3.60% 3.90%
Mexico | 2026    
Disclosure of financial assets [line items]    
GDP level (%, start-to-peak) 16.60% 16.90%
Mexico | 2027    
Disclosure of financial assets [line items]    
Unemployment rate (%, min) 2.50% 2.80%
House price index (%, start-to-peak) 29.30% 29.50%
Inflation rate (YoY % change, min) 2.40% 4.20%
Central bank policy rate (%, min) 5.70% 8.10%