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Provisions - Actuarial Assumptions (Details)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Domestic Plans      
PROVISIONS      
Discount rates 2.30% 2.10% 2.70%
Future salary increases 2.50% 2.50% 2.50%
Future pension increases 2.00% 2.00% 2.00%
Employee turnover 2.00% 2.00% 2.00%
Inflation 2.00% 2.00% 2.00%
Foreign Plans      
PROVISIONS      
Discount rates 0.80% 0.60% 0.70%
Future salary increases 1.70% 1.70% 1.70%
Future pension increases 0.10% 0.00% 0.00%
Employee turnover 16.20% 10.30% 10.30%
Inflation 1.40% 1.40% 1.40%
Other Post Employment Plans      
PROVISIONS      
Discount rates 3.90% 4.00% 4.00%
Future salary increases 5.00% 6.00% 6.30%
Future pension increases 0.00% 0.00% 0.00%
Employee turnover 8.20% 8.60% 8.70%
Inflation 1.00% 1.10% 1.00%