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Current tax assets (Details) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016
CurrentTaxAssetsLineItems [Line Items]
Current tax assets, current	€ 191	€ 383
Italian subsidiaries [Member]
CurrentTaxAssetsLineItems [Line Items]
Current tax assets, current	99	134
Subsidiaries outside Italy [Member]
CurrentTaxAssetsLineItems [Line Items]
Current tax assets, current	€ 92	€ 249

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- References

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- Definition

The current amount of current tax assets. [Refer: Current tax assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 54
-Subparagraph n
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_n&doctype=Standard
-URIDate 2017-03-09

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