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Employee benefits - Actuarial assumptions (Details)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Minimum [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Resignation rate (as a percent) 6.00%    
Dismissal rate (as a percent) 1.00%    
Average future salary growth increment (as a percent) 2.00% 2.00% 2.00%
Overall long-term rate of return on assets 2.60% 0.90% 0.70%
Maximum [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Resignation rate (as a percent) 10.00%    
Dismissal rate (as a percent) 2.00%    
Average future salary growth increment (as a percent) 5.80% 5.00% 4.80%
Overall long-term rate of return on assets 5.10% 2.90% 4.00%
Early retirement | Minimum [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Discount rate (as a percent) 4.70% 1.00% 0.90%
Early retirement | Maximum [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Discount rate (as a percent) 4.80% 1.20% 1.00%
Annual absence | Minimum [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Discount rate (as a percent) 5.10% 2.60% 2.40%
Annual absence | Maximum [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Discount rate (as a percent) 5.20% 2.90% 2.50%
Tuition fees | Minimum [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Discount rate (as a percent) 4.80% 1.60% 1.30%
Tuition fees | Maximum [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Discount rate (as a percent) 5.00% 2.20% 1.90%
Defined benefit plan | Minimum [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Discount rate (as a percent) 3.80% 0.70% 1.00%
Defined benefit plan | Maximum [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Discount rate (as a percent) 5.30% 3.30% 2.70%
Subsidiaries | Minimum [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Resignation rate (as a percent) 2.60%    
Dismissal rate (as a percent) 2.00%    
Subsidiaries | Maximum [Member]      
Disclosure of net defined benefit liability (asset) [line items]      
Resignation rate (as a percent) 4.20%    
Dismissal rate (as a percent) 4.20%