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Financial liabilities (Details 4) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Information on net borrowings [Line Items]    
Short-term Debt € 2,182 € 2,242
Borrowings € 25,865 24,707
Weighted Average [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Borrowings, interest rate  
Euro [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Short-term Debt   € 904
Euro [Member] | Weighted Average [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Borrowings, interest rate 0.50%
United States of America Dollars [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Short-term Debt   € 1,329
United States of America Dollars [Member] | Weighted Average [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Borrowings, interest rate 1.80%
Other Currencies [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Short-term Debt   € 9
Other Currencies [Member] | Weighted Average [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Borrowings, interest rate (0.70%)
Long term debt and current portion of longterm debt [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Short-term Debt € 2,182 € 2,242
Borrowings € 25,865 24,707
Long term debt and current portion of longterm debt [Member] | Weighted Average [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Borrowings, interest rate  
Long term debt and current portion of longterm debt [Member] | Euro [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Borrowings € 20,094
Long term debt and current portion of longterm debt [Member] | Euro [Member] | Weighted Average [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Borrowings, interest rate 2.40%
Long term debt and current portion of longterm debt [Member] | United States of America Dollars [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Borrowings € 1,694
Long term debt and current portion of longterm debt [Member] | United States of America Dollars [Member] | Weighted Average [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Borrowings, interest rate 4.80%
Long term debt and current portion of longterm debt [Member] | Other Currencies [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Borrowings € 677
Long term debt and current portion of longterm debt [Member] | Other Currencies [Member] | Weighted Average [Member]    
Disclosure Of Information on net borrowings [Line Items]    
Borrowings, interest rate 4.70%