Long-term Employee Benefits - Schedule of Assumptions Used (Details) - Pension Plan [Member]	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Discount rate to determine benefit obligation	2.13%	2.52%	3.05%
Discount rate to determine net cost	2.52%	3.05%	3.23%
Rate of future compensation increases to determine benefit obligation	2.69%	3.07%	3.03%
Rate of future compensation increases to determine net cost	3.07%	3.03%	3.57%
Rate of return on plan assets to determine net cost	4.73%	4.75%	5.21%