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Other current liabilities (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure Of Other Current Liabilities Explanatory [Abstract]  
Disclosure of detailed information about Other current liabilities [Text Block]
(€ million)   December 31, 2017   December 31, 2016
Fair value of derivatives financial instruments     1,011       2,108  
Other liabilities     504       491  
      1,515       2,599