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Other non-current liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure Of Other Non-current Liabilities Explanatory [Abstract]  
Disclosure of detailed information about Other non-current liabilities [Text Block]
(€ million)   December 31, 2017   December 31, 2016
Fair value of derivatives financial instruments     91       161  
Income tax liabilities     36       35  
Other payables towards tax authorities     9       9  
Cautionary deposits     255       265  
Other payables     45       51  
Other liabilities     1,043       1,247  
      1,479       1,768