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Employee Defined Benefit Obligations - Summary of Principal Assumptions Used In Determining Pension Benefit Obligations (Details)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Employee Benefits [Abstract]    
Discount rate 1.80% 1.15%
Rate of increase in salaries 4.27% 4.17%
Rate of inflation, pre-retirement 2.74% 2.40%
Rate of increase in future pensions payment 3.49% 3.41%
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