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Employee Benefits (Details) - Summary of principal actuarial assumptions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Summary of principal actuarial assumptions [Abstract]    
Discount rate - addition of 0.5% (42.00%) (37.00%)
Rate of future salary increases - addition of 0.5% 35.00% 27.00%
Rate of employees leaving - addition of 5.0% (25.00%) (12.00%)
Mortality rate assumption, addition of 5.0% (4.00%) (2.00%)