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Long-term Employee Benefits (Assumptions) (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]    
Discount rate 1.40% 2.00%
Rate of compensation increase 2.60% 2.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]    
Discount rate 2.00% 1.90%
Rate of compensation increase 2.50% 2.50%
Expected return on plan assets 4.10% 4.10%