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Other non-current assets (Details) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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DisclosureOfOtherNoncurrentLiabilitiesExplanatoryLineItems [Line Items] |  |
Tax receivables from_non-current | € 507 | € 502
Other receivables_related to divestments | 118 | 222
Other receivables_Other non-current | 44 | 52
Other receivables_non-current | 162 | 274
Non-current derivative financial assets | 80 | 108
Other non-current assets, other assets | 574 | 464
Other non-current assets | 1,323 | 1,348
Italian tax authorities [Member] |  |
DisclosureOfOtherNoncurrentLiabilitiesExplanatoryLineItems [Line Items] |  |
Non-current_Income tax | 62 | 73
Non-current_Interest on tax credits | 64 | 64
Non-current tax receivables from Italian tax authorities | 126 | 137
Non-Italian tax authorities [Member] |  |
DisclosureOfOtherNoncurrentLiabilitiesExplanatoryLineItems [Line Items] |  |
Non-current tax receivables from non-Italian tax authorities | € 381 | € 365

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