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Other non-current assets (Tables) | 12 Months Ended
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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 |

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- Definition The disclosure of detailed information about other non-current assets. + References No definition available. + Details
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Balance Type: | na
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- References No definition available. + Details
Name: | E_DisclosureOfOtherNonCurrentAssetsExplanatoryAbstract
Namespace Prefix: | E_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration