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Provisions for employee benefits - Analysis by geographical area related to the main actuarial assumptions (Details)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Minimum | Foreign defined benefit plan    
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
Maximum | Foreign defined benefit plan    
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
Euro Area | Minimum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 3.20% 3.50%
Rate of compensation increase 1.90% 1.90%
Rate of price inflation 1.90% 1.90%
Life expectations on retirement at age 65 21 years 21 years
Euro Area | Maximum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 3.30% 3.80%
Rate of compensation increase 3.00% 3.00%
Rate of price inflation 2.10% 2.20%
Life expectations on retirement at age 65 23 years 22 years
Rest of Europe    
Disclosure Of Benefit Plans [Line Items]    
Rate of compensation increase 3.00%  
Life expectations on retirement at age 65 23 years  
Rest of Europe | Minimum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 1.40% 2.20%
Rate of compensation increase   3.00%
Rate of price inflation 1.20% 1.20%
Life expectations on retirement at age 65   23 years
Rest of Europe | Maximum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 4.50% 4.80%
Rate of compensation increase   4.00%
Rate of price inflation 3.40% 3.50%
Life expectations on retirement at age 65   24 years
Africa | Minimum    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 3.20% 3.80%
Rate of compensation increase 5.00% 1.90%
Rate of price inflation 3.10% 3.00%
Life expectations on retirement at age 65 14 years 13 years
Africa | 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 18 years 17 years
Other areas    
Disclosure Of Benefit Plans [Line Items]    
Discount rate 6.90% 7.00%
Rate of compensation increase 5.00% 5.00%
Rate of price inflation 3.50% 3.00%