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Provisions for employee benefits (Details 2) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]    
Total interest cost (income), net   € 15
Plan assets [member]    
Statement [Line Items]    
Total interest cost (income), net € (17) (20)
Profit and Loss [Member]    
Statement [Line Items]    
Current cost 71 80
Past service cost and (gains) losses on settlements 118 29
- interest cost on liabilities 38 35
- interest income on plan assets (17) (20)
Total interest cost (income), net 21 15
Remeasurements for long-term plans 30 3
Employee benefits expense 240 127
Payroll and related cost [Member]    
Statement [Line Items]    
Total interest cost (income), net 1 1
Employee benefits expense 220 113
Financial Income Expense [Member]    
Statement [Line Items]    
Total interest cost (income), net 20 14
Employee benefits expense 20 14
TFR [Member]    
Statement [Line Items]    
- interest cost on liabilities 4 3
Total interest cost (income), net 4 3
Employee benefits expense 4 3
TFR [Member] | Financial Income Expense [Member]    
Statement [Line Items]    
Total interest cost (income), net 4 3
Employee benefits expense 4 3
Foreign defined benefit plan [Member]    
Statement [Line Items]    
Current cost 27 24
Past service cost and (gains) losses on settlements 2 (1)
- interest cost on liabilities 31 29
- interest income on plan assets (17) (20)
Total interest cost (income), net 14 9
Employee benefits expense 43 32
Foreign defined benefit plan [Member] | Plan assets [member]    
Statement [Line Items]    
Total interest cost (income), net (17) (20)
Foreign defined benefit plan [Member] | Payroll and related cost [Member]    
Statement [Line Items]    
Employee benefits expense 29 23
Foreign defined benefit plan [Member] | Financial Income Expense [Member]    
Statement [Line Items]    
Total interest cost (income), net 14 9
Employee benefits expense 14 9
FISDE and other foreign medical plans [Member]    
Statement [Line Items]    
Current cost 2 2
Past service cost and (gains) losses on settlements 1 2
- interest cost on liabilities 2 2
Total interest cost (income), net 2 2
Employee benefits expense 5 6
FISDE and other foreign medical plans [Member] | Payroll and related cost [Member]    
Statement [Line Items]    
Employee benefits expense 3 4
FISDE and other foreign medical plans [Member] | Financial Income Expense [Member]    
Statement [Line Items]    
Total interest cost (income), net 2 2
Employee benefits expense 2 2
Other benefit plans [Member]    
Statement [Line Items]    
Current cost 42 54
Past service cost and (gains) losses on settlements 115 28
- interest cost on liabilities 1 1
Total interest cost (income), net 1 1
Remeasurements for long-term plans 30 3
Employee benefits expense 188 86
Other benefit plans [Member] | Payroll and related cost [Member]    
Statement [Line Items]    
Total interest cost (income), net 1 1
Employee benefits expense 188 86
Total interest cost (income), net  
Defined benefit plan [Member]    
Statement [Line Items]    
Current cost 29 26
Past service cost and (gains) losses on settlements 3 1
- interest cost on liabilities 37 34
- interest income on plan assets (17) (20)
Total interest cost (income), net 20 14
Employee benefits expense 52 41
Defined benefit plan [Member] | Plan assets [member]    
Statement [Line Items]    
Total interest cost (income), net (17) (20)
Defined benefit plan [Member] | Payroll and related cost [Member]    
Statement [Line Items]    
Employee benefits expense 32 27
Defined benefit plan [Member] | Financial Income Expense [Member]    
Statement [Line Items]    
Total interest cost (income), net 20 14
Employee benefits expense € 20 € 14