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Provisions for employee benefits (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Benefit Plans [Line Items]    
Provisions for employee benefits € 786 € 819
Other benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Provisions for employee benefits 341 301
Defined benefit plan    
Disclosure Of Benefit Plans [Line Items]    
Provisions for employee benefits 445 518
Italian defined benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Provisions for employee benefits 177 227
Foreign defined benefit plan    
Disclosure Of Benefit Plans [Line Items]    
Provisions for employee benefits 142 129
FISDE and other foreign medical plans    
Disclosure Of Benefit Plans [Line Items]    
Provisions for employee benefits € 126 € 162