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Other non-current assets (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure Of Other Non Current Assets Explanatory [Abstract]  
Disclosure of detailed information about Other non-current assets [Text Block]
(€ million)   December 31, 2017   December 31, 2016
Tax receivables from:                
- Italian tax authorities                
- income tax     62       73  
- interest on tax credits     64       64  
      126       137  
- non-Italian tax authorities     381       365  
      507       502  
Other receivables:                
- related to divestments     118       222  
- other non-current     44       52  
      162       274  
Fair value of derivative financial instruments     80       108  
Other asset     574       464  
      1,323       1,348