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Employee Benefits (Actuarial Assumptions) (Details)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Discount rate as at the end of the year [Member]      
Actuarial assumptions [Line Items]      
Principal actuarial assumptions 2.10% 3.00% 2.70%
Future salary increases [Member]      
Actuarial assumptions [Line Items]      
Principal actuarial assumptions 3.20% 3.30% 3.20%
Future pension increase [Member]      
Actuarial assumptions [Line Items]      
Principal actuarial assumptions 2.10% 2.20% 2.20%