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Provisions for employee benefits - Actuarial assumptions used in the measurement of the liabilities (Details)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Other benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Rate of price inflation 2.00% 2.40%
Other benefit plans | Minimum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 3.10% 3.40%
Other benefit plans | Maximum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 3.30% 3.70%
Italian defined benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 3.10% 3.70%
Rate of compensation increase 3.00% 3.40%
Rate of price inflation 2.00% 2.40%
Foreign defined benefit plan | Minimum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 1.40% 2.20%
Rate of compensation increase 1.90% 1.90%
Rate of price inflation 1.20% 1.20%
Life expectations on retirement at age 65 14 years 13 years
Foreign defined benefit plan | Maximum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 25.90% 15.40%
Rate of compensation increase 20.00% 12.50%
Rate of price inflation 15.50% 11.50%
Life expectations on retirement at age 65 23 years 24 years
FISDE    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 3.10% 3.70%
Rate of price inflation 2.00% 2.40%
Life expectations on retirement at age 65 24 years 24 years