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Other current assets (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure Of Other Current Assets [Abstract]  
Disclosure of detailed information about other current assets [text block]
(€ million)   December 31, 2017   December 31, 2016
Fair value of derivative financial instruments     1,231       2,248  
Other current assets     342       343  
      1,573       2,591