v3.25.4
Interest in associates and joint ventures - Principal associates of HSBC (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 17, 2025
Jun. 16, 2025
Dec. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Disclosure of associates [line items]            
Carrying amount     $ 29,469   $ 28,777  
Bank Of Communications Co., Limited            
Disclosure of associates [line items]            
Carrying amount     22,456 $ 22,456 22,367 $ 22,367
Fair value     $ 11,713   11,631  
HSBC’s interest percent 16.00% 19.03% 16.00%      
Saudi Awwal Bank            
Disclosure of associates [line items]            
Carrying amount     $ 5,511   5,027  
Fair value     $ 5,499   $ 5,705  
HSBC’s interest percent     31.00%