v3.25.4
Debt securities in issue - Summary of debt securities in issue (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities $ 2,882,187 $ 2,682,252
Trading liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 72,122 65,982
Financial liabilities designated at fair value    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 158,456 138,727
Bonds and medium-term notes    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 185,974 163,903
Other debt securities in issue    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 30,243 41,661
Debt securities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 216,217 205,564
Debt securities | Trading liabilities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 40 73
Debt securities | Financial liabilities designated at fair value    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 116,502 99,706
Debt securities | At cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 99,675 105,785
HSBC Holdings    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 153,859 138,096
HSBC Holdings | Financial liabilities designated at fair value    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 52,907 41,582
HSBC Holdings | Debt securities    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 113,711 97,588
HSBC Holdings | Debt securities | Financial liabilities designated at fair value    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities 44,687 33,268
HSBC Holdings | Debt securities | At cost    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities $ 69,024 $ 64,320