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Provisions for employee benefits (Details 2) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Employee benefits expense € 2,951 € 2,994 € 3,119
Profit and loss [Member]      
Statement Line Items [Line Items]      
Current cost 80 86  
Past service cost and (gains) losses on settlements 29 (5)  
- interest cost on liabilities 35 44  
- interest income on plan assets (20) (20)  
Total interest cost (income), net 15 24  
Remeasurements for long-term plans 3 (1)  
Employee benefits expense 127 104  
Payroll and related cost [Member]      
Statement Line Items [Line Items]      
Total interest cost (income), net 1 1  
Employee benefits expense 113 81  
Financial income (expense) [Member]      
Statement Line Items [Line Items]      
Total interest cost (income), net 14 23  
Employee benefits expense 14 23  
TFR [Member]      
Statement Line Items [Line Items]      
- interest cost on liabilities 3 6  
Total interest cost (income), net 3 6  
Employee benefits expense 3 6  
TFR [Member] | Financial income (expense) [Member]      
Statement Line Items [Line Items]      
Total interest cost (income), net 3 6  
Employee benefits expense 3 6  
Foreign defined benefit plans [Member]      
Statement Line Items [Line Items]      
Current cost 24 28  
Past service cost and (gains) losses on settlements (1) (4)  
- interest cost on liabilities 29 34  
- interest income on plan assets (20) (20)  
Total interest cost (income), net 9 14  
Employee benefits expense 32 38  
Foreign defined benefit plans [Member] | Payroll and related cost [Member]      
Statement Line Items [Line Items]      
Employee benefits expense 23 24  
Foreign defined benefit plans [Member] | Financial income (expense) [Member]      
Statement Line Items [Line Items]      
Total interest cost (income), net 9 14  
Employee benefits expense 9 14  
FISDE and other foreign medical plans [Member]      
Statement Line Items [Line Items]      
Current cost 2 2  
Past service cost and (gains) losses on settlements   2  
- interest cost on liabilities 2 3  
Total interest cost (income), net 2 3  
Employee benefits expense 4 7  
FISDE and other foreign medical plans [Member] | Payroll and related cost [Member]      
Statement Line Items [Line Items]      
Employee benefits expense 2 4  
FISDE and other foreign medical plans [Member] | Financial income (expense) [Member]      
Statement Line Items [Line Items]      
Total interest cost (income), net 2 3  
Employee benefits expense 2 3  
Other benefit plans [Member]      
Statement Line Items [Line Items]      
Current cost 54 56  
Past service cost and (gains) losses on settlements 30 (3)  
- interest cost on liabilities 1 1  
Total interest cost (income), net 1 1  
Remeasurements for long-term plans 3 (1)  
Employee benefits expense 88 53  
Other benefit plans [Member] | Payroll and related cost [Member]      
Statement Line Items [Line Items]      
Total interest cost (income), net 1 1  
Employee benefits expense € 88 € 53