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Provisions for employee benefits (Details 8)
€ in Millions
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Statement [Line Items]      
Net defined benefit liability (asset) € 136 € 31 € 3
Italian defined benefit plans [Member] | Not later than one year [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 15 16  
Italian defined benefit plans [Member] | Later than one year and not later than two years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 16 17  
Italian defined benefit plans [Member] | Later than two years and not later than three years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 18 18  
Italian defined benefit plans [Member] | Later than three years and not later than four years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 14 17  
Italian defined benefit plans [Member] | Later than three years and not later than five years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 11 14  
Italian defined benefit plans [Member] | Later than five years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) € 201 € 202  
Italian defined benefit plans [Member] | Weighted Average Duration [Member]      
Statement [Line Items]      
Weighted average duration of defined benefit obligation | Pure 10.1 10.1  
Foreign defined benefit plan [Member] | Not later than one year [member]      
Statement [Line Items]      
Net defined benefit liability (asset) € 54 € 47  
Foreign defined benefit plan [Member] | Later than one year and not later than two years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 56 65  
Foreign defined benefit plan [Member] | Later than two years and not later than three years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 63 70  
Foreign defined benefit plan [Member] | Later than three years and not later than four years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 64 79  
Foreign defined benefit plan [Member] | Later than three years and not later than five years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 74 84  
Foreign defined benefit plan [Member] | Later than five years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) € 74 € 64  
Foreign defined benefit plan [Member] | Weighted Average Duration [Member]      
Statement [Line Items]      
Weighted average duration of defined benefit obligation | Pure 17.4 17.5  
FISDE and other foreign medical plans [Member] | Not later than one year [member]      
Statement [Line Items]      
Net defined benefit liability (asset) € 9 € 7  
FISDE and other foreign medical plans [Member] | Later than one year and not later than two years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 7 7  
FISDE and other foreign medical plans [Member] | Later than two years and not later than three years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 6 6  
FISDE and other foreign medical plans [Member] | Later than three years and not later than four years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 6 6  
FISDE and other foreign medical plans [Member] | Later than three years and not later than five years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 6 6  
FISDE and other foreign medical plans [Member] | Later than five years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) € 114 € 103  
FISDE and other foreign medical plans [Member] | Weighted Average Duration [Member]      
Statement [Line Items]      
Weighted average duration of defined benefit obligation | Pure 12.8 12.8  
Other benefit plans [Member] | Not later than one year [member]      
Statement [Line Items]      
Net defined benefit liability (asset) € 81 € 64  
Other benefit plans [Member] | Later than one year and not later than two years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 72 58  
Other benefit plans [Member] | Later than two years and not later than three years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 67 45  
Other benefit plans [Member] | Later than three years and not later than four years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 20 7  
Other benefit plans [Member] | Later than three years and not later than five years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) 17 5  
Other benefit plans [Member] | Later than five years [member]      
Statement [Line Items]      
Net defined benefit liability (asset) € 57 € 25  
Other benefit plans [Member] | Weighted Average Duration [Member]      
Statement [Line Items]      
Weighted average duration of defined benefit obligation | Pure 2.6 2.8