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Provisions - Disclosure of Assumptions Used to Measure Retirement Benefits (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [table]    
Social security contribution rate 42.01% 44.00%
Discount rate 0.98% 0.33%
Staff turnover 0.0586% 0.0586%
Duration 20 years 17 years
Management    
Disclosure of defined benefit plans [table]    
Retirement assumptions 66 years 66 years
Non-management    
Disclosure of defined benefit plans [table]    
Retirement assumptions 64 years 64 years
Executive    
Disclosure of defined benefit plans [table]    
Salary increase rate (including inflation) 3.00% 3.00%
Non-executive    
Disclosure of defined benefit plans [table]    
Salary increase rate (including inflation) 0.025% 0.025%