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Provisions for employee benefits - Actuarial assumptions used in the measurement of the liabilities (Details)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Other benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Rate of price inflation 2.40% 1.80%
Other benefit plans | Minimum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 3.40% 0.00%
Other benefit plans | Maximum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 3.70% 1.00%
Italian defined benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 3.70% 1.00%
Rate of compensation increase 3.40% 2.80%
Rate of price inflation 2.40% 1.80%
Foreign defined benefit plan | Minimum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 2.20% 0.30%
Rate of compensation increase 1.90% 1.50%
Rate of price inflation 1.20% 0.70%
Life expectations on retirement at age 65 13 years 13 years
Foreign defined benefit plan | Maximum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 15.40% 15.30%
Rate of compensation increase 12.50% 12.50%
Rate of price inflation 11.50% 13.30%
Life expectations on retirement at age 65 24 years 25 years
FISDE and other foreign medical plans    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 3.70% 1.00%
Rate of price inflation 2.40% 1.80%
Life expectations on retirement at age 65 24 years 24 years