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Financial assets and liabilities - Carrying amount and undrawn borrowing facilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Financial assets and liabilities    
Borrowings € 8,402 € 9,707
Undrawn amount 679 250
Not later than one year    
Financial assets and liabilities    
Borrowings 2 8
Undrawn amount 1 1
Expiring beyond one year    
Financial assets and liabilities    
Undrawn amount 678 249
Euro    
Financial assets and liabilities    
Borrowings 2,770 3,167
U.S. dollar    
Financial assets and liabilities    
Borrowings 5,183 6,538
British pounds    
Financial assets and liabilities    
Borrowings € 449 € 2