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Provisions for employee benefits (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]    
Provisions for employee benefits € 1,117 € 1,022
Italian defined benefit plans [Member]    
Statement [Line Items]    
Provisions for employee benefits 275 284
Foreign defined benefit plans [Member]    
Statement [Line Items]    
Provisions for employee benefits 385 409
FISDE foreign medical plans and other [Member]    
Statement [Line Items]    
Provisions for employee benefits 148 135
Defined benefit plans [Member]    
Statement [Line Items]    
Provisions for employee benefits 808 828
Other benefit plans [Member]    
Statement [Line Items]    
Provisions for employee benefits € 309 € 194