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Provisions for employee benefits (Details 5)
Dec. 31, 2018
Dec. 31, 2017
Bottom of range [member]    
Statement [Line Items]    
Rate of compensation increase 1.50%  
Rate of price inflation 0.80%  
Life expectations on retirement at age 65 13  
Top of range [member]    
Statement [Line Items]    
Rate of compensation increase 16.50%  
Rate of price inflation 16.00%  
Life expectations on retirement at age 65 25  
Foreign defined benefit plan [Member] | Bottom of range [member]    
Statement [Line Items]    
Discount rate 0.80% 0.60%
Rate of compensation increase 1.50% 1.50%
Rate of price inflation 0.80% 0.60%
Life expectations on retirement at age 65 13 13
Foreign defined benefit plan [Member] | Top of range [member]    
Statement [Line Items]    
Discount rate 18.00% 15.50%
Rate of compensation increase 16.50% 13.50%
Rate of price inflation 16.00% 14.80%
Life expectations on retirement at age 65 25 24
FISDE and other foreign medical plans [Member]    
Statement [Line Items]    
Discount rate 1.50% 1.50%
Rate of price inflation 1.50% 1.50%
Life expectations on retirement at age 65 24 24
Other benefit plans [Member]    
Statement [Line Items]    
Rate of price inflation 1.50% 1.50%
Other benefit plans [Member] | Bottom of range [member]    
Statement [Line Items]    
Discount rate 0.20% 0.00%
Other benefit plans [Member] | Top of range [member]    
Statement [Line Items]    
Discount rate 1.50% 1.50%
Italian defined benefit plans [Member]    
Statement [Line Items]    
Discount rate 1.50% 1.50%
Rate of compensation increase 2.50% 2.50%
Rate of price inflation 1.50% 1.50%