v3.25.4
Financial Investments - HSBC Holdings, Carrying amount of financial investments (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Financial assets $ 3,117,161 $ 2,923,319
Debt instruments measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets 182,089 153,973
Debt instruments measured at amortised cost | Treasury and other eligible bills    
Disclosure of financial assets [line items]    
Financial assets 23,445 22,148
Debt instruments measured at amortised cost | Debt securities    
Disclosure of financial assets [line items]    
Financial assets 158,644 131,825
HSBC Holdings    
Disclosure of financial assets [line items]    
Financial assets 133,493 119,683
HSBC Holdings | Debt securities    
Disclosure of financial assets [line items]    
Financial assets 15,470 10,328
HSBC Holdings | Debt instruments measured at amortised cost    
Disclosure of financial assets [line items]    
Financial assets 15,470 10,328
HSBC Holdings | Debt instruments measured at amortised cost | Treasury and other eligible bills    
Disclosure of financial assets [line items]    
Financial assets 15,470 9,556
HSBC Holdings | Debt instruments measured at amortised cost | Debt securities    
Disclosure of financial assets [line items]    
Financial assets $ 0 $ 772