v3.25.4
Interest in associates and joint ventures - Narrative (Details)
$ in Millions
 9 Months Ended 12 Months Ended
Jun. 17, 2025
Jun. 16, 2025
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2025
USD ($)
component
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Disclosure of associates [line items]              
Reclassification adjustments of other reserves losses of net investments in foreign operations, before tax         $ (1,104) $ 0 $ 0
Carrying amount         $ 29,469 28,777  
Number of components in VIU calculation | component         2    
Short to medium forecast term         5 years    
Bank Of Communications Co., Limited              
Disclosure of associates [line items]              
Reclassification adjustments of other reserves losses of net investments in foreign operations, before tax         $ 1,100    
HSBC’s interest percent 16.00% 19.03%     16.00%    
Impairment loss recognised in profit or loss     $ 4,139 $ 2,917 $ 1,000 0 $ 3,000
Carrying amount     $ 22,456 $ 22,367 22,456 22,367  
Fair value         $ 11,713 $ 11,631  
Long-term profit growth rate         3.00% 3.00%  
Long-term asset growth rate         3.25% 3.25%  
Discount rate         8.08% 8.53%  
Expected credit losses as a percentage of customer advances in the long term         0.87% 0.97%  
Risk-weighted assets as a percentage of total assets in the long term         62.00% 62.00%  
Effective tax rate in the long-term         15.00% 15.00%  
Capital adequacy ratio         12.50% 12.50%  
Tier 1 capital adequacy ratio         9.50% 9.50%  
Change in discount rate from prior year         0.50%    
Bank Of Communications Co., Limited | Minimum              
Disclosure of associates [line items]              
Fair value         $ 7,500    
Discount rate         7.10% 7.10%  
Expected credit losses as a percentage of customer advances in the short to medium term         0.67% 0.74%  
Risk-weighted assets as a percentage of total assets in the short to medium term         62.00% 62.00%  
Loans & advances to customer growth rate         7.50% 7.50%  
Operating income ratio         0.50% 0.10%  
Cost-income ratio         34.80% 34.60%  
Value in use of investments in associates after reasonably possible changes in key assumptions         $ 13,400 $ 13,500  
Bank Of Communications Co., Limited | Maximum              
Disclosure of associates [line items]              
Fair value         $ 13,100    
Discount rate         8.70% 8.80%  
Expected credit losses as a percentage of customer advances in the short to medium term         0.87% 0.93%  
Risk-weighted assets as a percentage of total assets in the short to medium term         64.20% 62.50%  
Loans & advances to customer growth rate         8.00% 9.50%  
Operating income ratio         7.40% 9.90%  
Cost-income ratio         40.00% 39.80%  
Value in use of investments in associates after reasonably possible changes in key assumptions         $ 31,000 $ 30,800  
Saudi Awwal Bank              
Disclosure of associates [line items]              
HSBC’s interest percent         31.00%    
Carrying amount         $ 5,511 5,027  
Fair value         $ 5,499 $ 5,705