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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, 2022
Dec. 31, 2021
Disclosure Of Benefit Plans [Line Items]    
Administrative fees paid € 1  
Current service cost 67 € 69
Past service cost and (gains) losses on settlements 127 107
- interest cost on liabilities 29 26
- interest income on plan assets (18) (12)
Interest cost (income), net 11 14
Remeasurements for long-term plans (22) (11)
Total 184 179
Payroll and related costs    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 1  
Total 174 165
Financial income (expense)    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 10 14
Total 10 14
Other benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Current service cost 52 49
Past service cost and (gains) losses on settlements 127 107
- interest cost on liabilities 1  
Interest cost (income), net 1  
Remeasurements for long-term plans (22) (11)
Total 158 145
Other benefit plans | Payroll and related costs    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 1  
Total 158 145
Defined benefit plan    
Disclosure Of Benefit Plans [Line Items]    
Current service cost 15 20
- interest cost on liabilities 28 26
- interest income on plan assets (18) (12)
Interest cost (income), net 10 14
Administrative fees paid 1  
Total 26 34
Defined benefit plan | Payroll and related costs    
Disclosure Of Benefit Plans [Line Items]    
Total 16 20
Defined benefit plan | Financial income (expense)    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 10 14
Total 10 14
Italian defined benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Current service cost 1 1
- interest cost on liabilities 2 1
Interest cost (income), net 2 1
Total 3 2
Italian defined benefit plans | Payroll and related costs    
Disclosure Of Benefit Plans [Line Items]    
Total 1 1
Italian defined benefit plans | Financial income (expense)    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 2 1
Total 2 1
Foreign defined benefit plan    
Disclosure Of Benefit Plans [Line Items]    
Current service cost 11 16
- interest cost on liabilities 24 24
- interest income on plan assets (18) (12)
Interest cost (income), net 6 12
Administrative fees paid 1  
Total 18 28
Foreign defined benefit plan | Payroll and related costs    
Disclosure Of Benefit Plans [Line Items]    
Total 12 16
Foreign defined benefit plan | Financial income (expense)    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 6 12
Total 6 12
FISDE and other foreign medical plans    
Disclosure Of Benefit Plans [Line Items]    
Current service cost 3 3
- interest cost on liabilities 2 1
Interest cost (income), net 2 1
Total 5 4
FISDE and other foreign medical plans | Payroll and related costs    
Disclosure Of Benefit Plans [Line Items]    
Total 3 3
FISDE and other foreign medical plans | Financial income (expense)    
Disclosure Of Benefit Plans [Line Items]    
Interest cost (income), net 2 1
Total € 2 € 1