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Post-employment Benefits - Weighted average durations (Details) - Y
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Seniority Premiums    
Post-employment benefit plans    
Weighted average duration of defined benefit obligation 7.9 14.5
Pensions    
Post-employment benefit plans    
Weighted average duration of defined benefit obligation 9.7 12.3