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Current tax assets
 12 Months Ended
Dec. 31, 2017
Disclosure Of Current Tax Assets [Abstract]  
Disclosure of current tax assets [text block]

13 Current tax assets

(€ million)   December 31, 2017   December 31, 2016
Italian subsidiaries     99       134  
Subsidiaries outside Italy     92       249  
      191       383  

Income taxes are described in note 43 — Income tax expense.