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Provisions for employee benefits (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Provisions for employee benefits € 1,022 € 868
TFR [Member]    
Statement Line Items [Line Items]    
Provisions for employee benefits 284 298
Foreign defined benefit plans [Member]    
Statement Line Items [Line Items]    
Provisions for employee benefits 409 276
FISDE and other foreign medical plans [Member]    
Statement Line Items [Line Items]    
Provisions for employee benefits 122 124
Other benefit plans [Member]    
Statement Line Items [Line Items]    
Provisions for employee benefits € 207 € 170