v3.25.2
Report of the directors financial review risk report - Scenario weightings (Details) - market
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Markets with lower uncertainty 4  
Consensus Upside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Probability 10.00% 10.00%
Consensus Upside scenario allowance for ECL | UK    
Disclosure of financial assets [line items]    
Probability 10.00% 10.00%
Consensus Upside scenario allowance for ECL | US    
Disclosure of financial assets [line items]    
Probability 10.00% 10.00%
Consensus Upside scenario allowance for ECL | Hong Kong    
Disclosure of financial assets [line items]    
Probability 10.00% 10.00%
Consensus Upside scenario allowance for ECL | Mainland China    
Disclosure of financial assets [line items]    
Probability 10.00% 10.00%
Consensus Upside scenario allowance for ECL | France    
Disclosure of financial assets [line items]    
Probability 10.00% 10.00%
Consensus Upside scenario allowance for ECL | UAE    
Disclosure of financial assets [line items]    
Probability 10.00% 10.00%
Consensus Upside scenario allowance for ECL | Mexico    
Disclosure of financial assets [line items]    
Probability 10.00% 10.00%
Consensus Central scenario allowance for ECL    
Disclosure of financial assets [line items]    
Probability 75.00% 75.00%
Consensus Central scenario allowance for ECL | UK    
Disclosure of financial assets [line items]    
Probability 65.00% 75.00%
Consensus Central scenario allowance for ECL | US    
Disclosure of financial assets [line items]    
Probability 65.00% 75.00%
Consensus Central scenario allowance for ECL | Hong Kong    
Disclosure of financial assets [line items]    
Probability 65.00% 75.00%
Consensus Central scenario allowance for ECL | Mainland China    
Disclosure of financial assets [line items]    
Probability 65.00% 75.00%
Consensus Central scenario allowance for ECL | France    
Disclosure of financial assets [line items]    
Probability 65.00% 75.00%
Consensus Central scenario allowance for ECL | UAE    
Disclosure of financial assets [line items]    
Probability 65.00% 75.00%
Consensus Central scenario allowance for ECL | Mexico    
Disclosure of financial assets [line items]    
Probability 65.00% 75.00%
Consensus Downside scenario allowance for ECL    
Disclosure of financial assets [line items]    
Probability 10.00% 10.00%
Consensus Downside scenario allowance for ECL | UK    
Disclosure of financial assets [line items]    
Probability 20.00% 10.00%
Consensus Downside scenario allowance for ECL | US    
Disclosure of financial assets [line items]    
Probability 20.00% 10.00%
Consensus Downside scenario allowance for ECL | Hong Kong    
Disclosure of financial assets [line items]    
Probability 20.00% 10.00%
Consensus Downside scenario allowance for ECL | Mainland China    
Disclosure of financial assets [line items]    
Probability 20.00% 10.00%
Consensus Downside scenario allowance for ECL | France    
Disclosure of financial assets [line items]    
Probability 20.00% 10.00%
Consensus Downside scenario allowance for ECL | UAE    
Disclosure of financial assets [line items]    
Probability 20.00% 10.00%
Consensus Downside scenario allowance for ECL | Mexico    
Disclosure of financial assets [line items]    
Probability 20.00% 10.00%
Downside 2 scenario allowance for ECL    
Disclosure of financial assets [line items]    
Probability 5.00% 5.00%
Downside 2 scenario allowance for ECL | UK    
Disclosure of financial assets [line items]    
Probability 5.00% 5.00%
Downside 2 scenario allowance for ECL | US    
Disclosure of financial assets [line items]    
Probability 5.00% 5.00%
Downside 2 scenario allowance for ECL | Hong Kong    
Disclosure of financial assets [line items]    
Probability 5.00% 5.00%
Downside 2 scenario allowance for ECL | Mainland China    
Disclosure of financial assets [line items]    
Probability 5.00% 5.00%
Downside 2 scenario allowance for ECL | France    
Disclosure of financial assets [line items]    
Probability 5.00% 5.00%
Downside 2 scenario allowance for ECL | UAE    
Disclosure of financial assets [line items]    
Probability 5.00% 5.00%
Downside 2 scenario allowance for ECL | Mexico    
Disclosure of financial assets [line items]    
Probability 5.00% 5.00%
Downside scenarios    
Disclosure of financial assets [line items]    
Probability 25.00%