v3.25.4
Legal proceedings and regulatory matters (Details)
€ in Millions, $ in Millions, $ in Millions, £ in Billions
 1 Months Ended 12 Months Ended
Jan. 31, 2026
EUR (€)
Sep. 30, 2025
USD ($)
Feb. 29, 2024
GBP (£)
Dec. 31, 2025
USD ($)
action
bankingRelationship
employee
Dec. 31, 2025
CAD ($)
action
bankingRelationship
employee
Oct. 31, 2025
USD ($)
Sep. 29, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
employee
Dec. 31, 2023
USD ($)
Disclosure of contingent liabilities [line items]                    
Estimated financial effect of contingent liabilities       $ 120,324       $ 110,019    
Other provisions       $ 3,441       1,724   $ 1,741
US Anti-Terrorism Act litigation                    
Disclosure of contingent liabilities [line items]                    
Number of hearings | action       6            
Number of claims dismissed | action       1            
Number of hearings in early procedural stage | action       5            
Benchmark rate litigation                    
Disclosure of contingent liabilities [line items]                    
Number of US dollar libor-related actions | action       2 2          
Investigations involving HSBC Private Bank (Suisse) SA                    
Disclosure of contingent liabilities [line items]                    
Number of historical banking relationships | bankingRelationship       2 2          
Precious metals fix-related litigation                    
Disclosure of contingent liabilities [line items]                    
Loss contingency, damages sought       $ 1,000            
Employees involved in litigation | employee       7            
Legal proceedings and regulatory matters                    
Disclosure of contingent liabilities [line items]                    
Other provisions       $ 1,662       $ 295   $ 380
HSBC Holdings and HSBC Bank plc | Foreign exchange-related investigations and litigation                    
Disclosure of contingent liabilities [line items]                    
Loss contingency, damages sought | £     £ 3              
Hongkong and Shanghai Banking Corporation | Korean short selling investigation                    
Disclosure of contingent liabilities [line items]                    
Number of current and former employees | employee       280 280       3  
Number of pending actions | action       1 1          
HSBC Bank plc | Tax related investigations | Litigation Closed                    
Disclosure of contingent liabilities [line items]                    
Damages paid | € € 302                  
Madoff Securities                    
Disclosure of contingent liabilities [line items]                    
Estimated financial effect of contingent liabilities       $ 184     $ 508      
Madoff Securities | HSBC Private Bank (Suisse) SA                    
Disclosure of contingent liabilities [line items]                    
Contingent liabilities dismissed   $ 292                
Madoff Securities | HSBC Bank USA, N.A.                    
Disclosure of contingent liabilities [line items]                    
Contingent liabilities dismissed   $ 32                
Fairfield                    
Disclosure of contingent liabilities [line items]                    
Estimated financial effect of contingent liabilities       382            
Herald Fund SPC                    
Disclosure of contingent liabilities [line items]                    
Estimated financial effect of contingent liabilities       5,600            
Herald Fund SPC | Cash and securities                    
Disclosure of contingent liabilities [line items]                    
Estimated financial effect of contingent liabilities       521            
Herald Fund SPC | HSBC Securities Services (Luxembourg) S.A. | Legal proceedings and regulatory matters                    
Disclosure of contingent liabilities [line items]                    
Other provisions       1,100   $ 1,100        
Alpha Prime Fund Limited                    
Disclosure of contingent liabilities [line items]                    
Estimated financial effect of contingent liabilities       3,300            
Alpha Prime Fund Limited | Restitution of Securities                    
Disclosure of contingent liabilities [line items]                    
Estimated financial effect of contingent liabilities       1,000            
Senator Fund SPC                    
Disclosure of contingent liabilities [line items]                    
Estimated financial effect of contingent liabilities       $ 1,400            
Ontario and Quebec Superior Courts                    
Disclosure of contingent liabilities [line items]                    
Estimated financial effect of contingent liabilities         $ 1,000          
Estimated financial effect of contingent liabilities, punitive damages         $ 250