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Provisions for employee benefits - Costs charged to the profit and loss account (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Benefit Plans [Line Items]    
Current service cost € 64 € 67
Past service cost and (gains) losses on settlements 84 127
- interest cost on liabilities 49 29
- interest income on plan assets (19) (18)
Interest cost (income), net 30 11
Remeasurements for long-term plans (2) (22)
Administrative fees paid   1
Total 176 184
Payroll and related costs    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 10 1
Total 156 174
Financial income (expense)    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 20 10
Total 20 10
Other benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Current service cost 51 52
Past service cost and (gains) losses on settlements 91 127
- interest cost on liabilities 10 1
Interest cost (income), net 10 1
Remeasurements for long-term plans (2) (22)
Total 150 158
Other benefit plans | Payroll and related costs    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 10 1
Total 150 158
Defined benefit plan    
Disclosure Of Benefit Plans [Line Items]    
Current service cost 13 15
Past service cost and (gains) losses on settlements (7)  
- interest cost on liabilities 39 28
- interest income on plan assets (19) (18)
Interest cost (income), net 20 10
Administrative fees paid   1
Total 26 26
Defined benefit plan | Payroll and related costs    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net   10
Total 6 16
Defined benefit plan | Financial income (expense)    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 20  
Total 20 10
Italian defined benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Current service cost 1 1
Past service cost and (gains) losses on settlements 2  
- interest cost on liabilities 6 2
Interest cost (income), net 6 2
Total 9 3
Italian defined benefit plans | Payroll and related costs    
Disclosure Of Benefit Plans [Line Items]    
Total 3 1
Italian defined benefit plans | Financial income (expense)    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 6 2
Total 6 2
Foreign defined benefit plan    
Disclosure Of Benefit Plans [Line Items]    
Current service cost 10 11
Past service cost and (gains) losses on settlements (13)  
- interest cost on liabilities 29 24
- interest income on plan assets (19) (18)
Interest cost (income), net 10 6
Administrative fees paid   1
Total 7 18
Foreign defined benefit plan | Payroll and related costs    
Disclosure Of Benefit Plans [Line Items]    
Total (3) 12
Foreign defined benefit plan | Financial income (expense)    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 10 6
Total 10 6
FISDE and other foreign medical plans    
Disclosure Of Benefit Plans [Line Items]    
Current service cost 2 3
Past service cost and (gains) losses on settlements 4  
- interest cost on liabilities 4 2
Interest cost (income), net 4 2
Total 10 5
FISDE and other foreign medical plans | Payroll and related costs    
Disclosure Of Benefit Plans [Line Items]    
Total 6 3
FISDE and other foreign medical plans | Financial income (expense)    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 4 2
Total € 4 € 2