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Employee Benefits (Actuarial Assumptions) (Details)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Discount rate as at the end of the year [Member]      
Actuarial assumptions [Line Items]      
Principal actuarial assumptions 1.70% 2.10% 3.00%
Future salary increases [Member]      
Actuarial assumptions [Line Items]      
Principal actuarial assumptions 3.40% 3.20% 3.30%
Future pension increase [Member]      
Actuarial assumptions [Line Items]      
Principal actuarial assumptions 2.00% 2.10% 2.20%