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Structured entities - Conduits (Details)
$ in Billions
12 Months Ended
Dec. 31, 2024
USD ($)
conduit
Dec. 31, 2023
USD ($)
Disclosure of information about consolidated structured entities [line items]    
Number of conduit types | conduit 2  
Securities investment conduits | Solitaire    
Disclosure of information about consolidated structured entities [line items]    
Asset backed securities $ 0.7 $ 1.0
Commercial paper held by HSBC 1.0 1.3
Multi-seller conduit    
Disclosure of information about consolidated structured entities [line items]    
Maximum exposure $ 5.2 $ 6.1