v3.25.4
Provisions - Narrative (Details)
$ in Millions
 1 Months Ended
Jan. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
case
Oct. 24, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2011
case
Dec. 31, 2007
case
Disclosure of other provisions [line items]              
Other provisions   $ 3,441   $ 1,724 $ 1,741    
Estimated financial effect of contingent liabilities   120,324   $ 110,019      
Herald Fund SPC              
Disclosure of other provisions [line items]              
Estimated financial effect of contingent liabilities   5,600          
Herald Fund SPC | Cash and securities              
Disclosure of other provisions [line items]              
Estimated financial effect of contingent liabilities   $ 521          
Brazil PIS And COFINS Tax Matters              
Disclosure of other provisions [line items]              
Selected cases | case   3       2 1
Cases provided for | case   1          
Other provisions   $ 400          
Bernard L. Madoff Investment Securities LLC Matters              
Disclosure of other provisions [line items]              
Other provisions     $ 1,100        
Tax related investigations | HSBC Continental Europe and the Paris branch of HSBC Bank Plc              
Disclosure of other provisions [line items]              
Other provisions   $ 300          
Tax related investigations | HSBC Bank plc | Contingent Matter Closed              
Disclosure of other provisions [line items]              
Damages paid $ 302