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Employee benefits - Actuarial assumptions (Details)
Dec. 31, 2023
Dec. 31, 2022
Actuarial assumption of discount rates    
Statement [line items]    
Discount rate 1.31%  
Actuarial assumption of discount rates | Bottom of range    
Statement [line items]    
Discount rate   1.40%
Actuarial assumption of discount rates | Top of range    
Statement [line items]    
Discount rate   1.41%
Actuarial assumption of expected rates of salary increases    
Statement [line items]    
Rate of increase in compensation levels 3.00% 3.00%