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Provisions for employees' benefits - Actuarial assumptions (Details)
Dec. 31, 2024
Dec. 31, 2023
Pension | Top of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 10.90% 11.70%
Salary growth rate 3.00% 4.50%
Expected inflation rate 4.00% 4.50%
Pension growth rate 3.30% 5.00%
Pension | Bottom of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 6.85% 7.50%
Salary growth rate 2.00% 3.50%
Expected inflation rate 3.00% 3.00%
Pension growth rate 3.00% 3.00%
Bonds    
Disclosure of detailed information about provision for employee benefits    
Discount rate 8.75% 7.25%
Expected inflation rate 3.00% 3.00%
Health    
Disclosure of detailed information about provision for employee benefits    
Expected inflation rate 3.00% 3.00%
Short-term rate 13.50% 12.80%
Long-term rate 4.00% 4.00%
Health | Top of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 11.20% 12.00%
Salary growth rate 4.00% 4.50%
Health | Bottom of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 8.75% 11.00%
Salary growth rate 3.00% 3.50%
Education    
Disclosure of detailed information about provision for employee benefits    
Expected inflation rate 3.00% 3.00%
Short-term rate 4.00% 4.00%
Long-term rate 4.00% 4.00%
Education | Top of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 11.00% 12.00%
Education | Bottom of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 9.00% 11.00%
Others    
Disclosure of detailed information about provision for employee benefits    
Expected inflation rate 3.00%  
Others | Top of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 11.60% 12.00%
Salary growth rate 5.00% 4.61%
Expected inflation rate   3.50%
Others | Bottom of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 5.70% 7.40%
Salary growth rate 4.00% 3.50%
Expected inflation rate   3.00%