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Employee Defined Benefit Obligations - Summary of Principal Assumptions Used In Determining Pension Benefit Obligations (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
Discount rate 1.15% 1.89%
Rate of increase in salaries 4.17% 4.34%
Rate of inflation, pre-retirement 2.40% 2.60%
Rate of increase in future pensions payment 3.41% 3.44%
Life expectancy at age 65 for current pensioners:    
  Male 22 years 22 years
  Female 24 years 24 years
Life expectancy at age 65 for current members aged 45:    
  Male 23 years 23 years
  Female 25 years 25 years