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Pensions and Other Post-Employment Benefits (Details 2)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Weighted-average assumptions used to determine benefit obligations at fiscal year end      
Rate of compensation increase 4.00% 4.00%  
Pension Benefits      
Weighted-average assumptions used to determine benefit obligations at fiscal year end      
Discount rate 3.53% 4.02% 4.27%
Rate of compensation increase 3.93% 4.04% 4.05%
Weighted-average assumptions used to determine net cost for the fiscal year      
Discount rate 3.93% 4.22% 4.00%
Expected long-term return on plan assets 6.89% 6.90% 7.15%
Rate of compensation increase 3.91% 3.93% 3.95%
Other Benefits      
Weighted-average assumptions used to determine benefit obligations at fiscal year end      
Discount rate 3.43% 3.68% 3.88%
Rate of compensation increase 4.00% 4.00% 4.00%
Weighted-average assumptions used to determine net cost for the fiscal year      
Discount rate 3.68% 3.88% 3.50%
Rate of compensation increase 4.00% 4.00% 4.00%