v3.26.1
Provisions for employees' benefits - Actuarial assumptions (Details)
Dec. 31, 2025
Dec. 31, 2024
Pension    
Disclosure of detailed information about provision for employee benefits    
Salary growth rate 3.00%  
Pension | Top of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 12.00% 10.90%
Salary growth rate   3.00%
Expected inflation rate 4.00% 4.00%
Pension growth rate 3.30% 3.30%
Pension | Bottom of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 9.90% 6.85%
Salary growth rate   2.00%
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 10.00% 8.75%
Expected inflation rate 3.30% 3.00%
Health    
Disclosure of detailed information about provision for employee benefits    
Salary growth rate 4.00%  
Expected inflation rate 3.30% 3.00%
Short-term rate 10.00% 13.50%
Long-term rate   4.00%
Health | Top of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 12.50% 11.20%
Salary growth rate   4.00%
Long-term rate 4.30%  
Health | Bottom of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 10.25% 8.75%
Salary growth rate   3.00%
Long-term rate 4.00%  
Education    
Disclosure of detailed information about provision for employee benefits    
Expected inflation rate 3.30% 3.00%
Short-term rate 4.30% 4.00%
Long-term rate 4.30% 4.00%
Education | Top of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 10.25% 11.00%
Education | Bottom of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 4.00% 9.00%
Others    
Disclosure of detailed information about provision for employee benefits    
Expected inflation rate 3.30% 3.00%
Others | Top of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 12.87% 11.60%
Salary growth rate 4.94% 5.00%
Others | Bottom of range    
Disclosure of detailed information about provision for employee benefits    
Discount rate 9.85% 5.70%
Salary growth rate 3.00% 4.00%